WO2018201238A1 - Système et procédé pour l'imagerie optique continue d'une surface d'un objet - Google Patents

Système et procédé pour l'imagerie optique continue d'une surface d'un objet Download PDF

Info

Publication number
WO2018201238A1
WO2018201238A1 PCT/CA2018/050505 CA2018050505W WO2018201238A1 WO 2018201238 A1 WO2018201238 A1 WO 2018201238A1 CA 2018050505 W CA2018050505 W CA 2018050505W WO 2018201238 A1 WO2018201238 A1 WO 2018201238A1
Authority
WO
WIPO (PCT)
Prior art keywords
drum
light
processor
conveyed
line scan
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CA2018/050505
Other languages
English (en)
Inventor
Inouk DUBÉ
Louis-Philippe LAMBERT
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Conception Genik Inc
Original Assignee
Conception Genik Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Conception Genik Inc filed Critical Conception Genik Inc
Publication of WO2018201238A1 publication Critical patent/WO2018201238A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/08—Measuring arrangements characterised by the use of optical techniques for measuring diameters
    • G01B11/10—Measuring arrangements characterised by the use of optical techniques for measuring diameters of objects while moving
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
    • G01N21/8901—Optical details; Scanning details
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
    • G01N21/952—Inspecting the exterior surface of cylindrical bodies or wires
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/89—Investigating the presence of flaws or contamination in moving material, e.g. running paper or textiles
    • G01N2021/8909—Scan signal processing specially adapted for inspection of running sheets

Definitions

  • the technical field generally relates to optical systems and methods, and more particularly to system and method for continuous optical inspection of materials, such as objects having a curved surface (e.g. , having a substantially tubular or filiform shape or having a substantially circular cross-section).
  • a curved surface e.g. , having a substantially tubular or filiform shape or having a substantially circular cross-section.
  • Stranded cables are typically composed of a plurality of cables (i.e. , individual strands) wrapped together or wound around a central cable.
  • the inner layers of the cable are sometimes covered with an adhesive material (e.g. , tar or other similar substances) to enable the individual strands to be insulated from each other while sticking altogether.
  • the adhesive material may leak and form defects on the surface of the cable, in between each individual strand. Such defects are likely to cause damage to the cables and may even cause failure of the cables when operated under normal conditions or when submitted to relatively high tension. Therefore, it is important to locate these defects effectively and/or prior use.
  • the present description generally relates to systems and methods for continuously imaging an object having a curved or circular surface (i.e. , having a substantially circular cross-section). Some of the present techniques can be particularly useful in the context of identifying and/or locating surface defects while the object is being conveyed.
  • the present techniques can be applied to the surface analysis of a curved or circular object (i.e. having a substantially circular cross- section) or implemented in a stranding process that involve stranding and conveying portion(s) of cables, as well as optically inspecting the stranded cables.
  • a curved or circular object i.e. having a substantially circular cross- section
  • Such embodiments can be referred to as "optical inspection of curved/circular surface embodiments”.
  • a system for continuously imaging a surface of an object including a support frame, a drum, an optical assembly and a processor.
  • the drum is mounted to the support frame, the drum having an inner periphery and a hollow body for receiving the object therethrough, the hollow body having an input end section, an output end section, and a central rotation axis extending through the input end section and the output end section, the drum being drivable to rotate about the central rotation axis in a conveying mode.
  • the optical assembly is mounted to the drum, such that the optical assembly rotates along with the drum in the conveying mode.
  • the optical assembly includes a light source configured to generate light toward the inner periphery of the inner hollow portion to illuminate the object, and a detector configured for detecting a resulting light emanating from the object, and producing a signal representative of the resulting light.
  • the processor is operatively connected to the detector, the processor being configured for receiving and processing the signal representative of the resulting light, thereby continuously generating an unwrapped image of the surface of the object and planarly representing the surface of the object.
  • the object is conveyed at a feeding speed in the conveying mode and the drum is configured to rotate at an adjustable rotational speed, the adjustable rotational speed being proportional to the feeding speed.
  • the adjustable rotational speed is included between 0 and 300 RPM.
  • the processor is mounted onto the rotatable drum.
  • the support frame includes a fixed holder, the fixed holder including a slip ring, the slip ring being operatively connected to the drum near or at the input end section.
  • the hollow body is cylindrical.
  • the system further includes at least one guiding element configured for supporting and guiding the object in the conveying mode.
  • the at least one guiding element is mounted near or at the output end section, and is configured for maintaining the object near a center of the hollow body.
  • the light has a spectral profile including a visible waveband extending from 390 to 800 nm.
  • the light source includes a plurality of light-emitting diodes.
  • the light source conforms to a shape of the inner periphery of the drum.
  • the system further includes a diffusing optical component, the diffusing optical component being optically coupled with the light source.
  • the diffusing optical component is a diffusing coating provided on a surface of the inner periphery of the drum.
  • the detector is a line scan camera.
  • the line scan camera has an X axis and a width extending along the X axis, the width being about 200 mm and having 2048 pixels along the X axis, such that the line scan camera has a spatial resolution of about 0.1 mm/pixel.
  • an acquisition rate of the line scan camera is included between 0 and 2000 lines/second and a bandwidth of the line scan camera is about 4 Mbytes/second.
  • the line scan camera is a monochrome line scan camera.
  • the detector is selected from the group consisting of: a 2D optical profiler, a 3D optical profiler, color line scan cameras, a charge coupled device (CCD), and a CMOS camera.
  • a focus, an aperture and a field of view of the detector are each individually adjustable.
  • the system further includes a programmable rotary encoder mounted to the drum to clock an image acquisition by the detector.
  • the system further includes a control unit including a servo-motor for driving a rotation of the drum.
  • control unit includes a microcontroller operatively connected to the light source, the detector and the servo-motor.
  • the drum is placed downstream of a cable stranding machine, the control unit being operatively connected to the stranding machine and being further configured for adjusting the adjustable rotational speed upon reception of information about the object being conveyed.
  • the object is a stranded cable and said information includes a pitch of the stranded cable.
  • the detector and the processor are combined into a single integrated device.
  • the single integrated device is a smart camera.
  • the light source includes two linear dome light sources and the detector includes two detection modules.
  • the two linear dome light sources are respectively mounted at a first pair of diametrically opposed points of the drum and the first pair of diametrically opposed points defines a first axis
  • the two detection modules are respectively mounted at a second pair of diametrically opposed points of the rotatable drum and the second pair of diametrically opposed points defines a second axis, the first axis being substantially perpendicular to the second axis.
  • the processor is configured for identifying a defect on the surface of the object, identifying a number of defects in a portion of the surface of the object, identifying a minimum/maximum size of the defect in the portion of the object, and identifying a quantity of a length of object being conveyed per unit of time.
  • the system is operatively connected to an operation unit, the processor being remotely connected to the operation unit.
  • the system further includes a wireless network card
  • the operation unit includes a programmable logic controller, the operation unit being remotely connected to the programmable logic controller through the wireless network card.
  • the operation unit is configured for receiving the signal representative of the resulting light from the processor through the wireless network card and is operable to operate the system upon reception of the signal representative of the emanating light.
  • a communication between the processor and the programmable logic controller relies on a communication protocol through an input/output port.
  • the communication protocol is a Modbus TCP/IP protocol.
  • the operation unit further includes an external router and an external computer, the processor being operatively connectable to the external router for transferring results of an analysis from the processor to the router.
  • the external computer includes a user interface and a display for displaying the results of the analysis.
  • the resulting light includes diffusely reflected light produced through diffuse reflection of the light off the object.
  • a system for continuously imaging a surface of a conveyed object, the conveyed object having a pitch and being conveyed at a feeding speed includes a drum, an optical assembly and a processor.
  • the drum drum has an input end section and an output end section, a central rotation axis extending from the input end section to the output end section and defining a conveying path, and a hollow body for receiving the conveyed object along the conveying path at the feeding speed, the hollow body having an inner periphery.
  • the optical assembly is mounted to the drum and is rotatable about the central rotation axis at an adjustable rotational speed, the adjustable rotational speed being proportional to the pitch of the conveyed object and to the feeding speed.
  • the optical assembly includes two light sources and two detectors.
  • the two light sources project light toward the inner periphery of the hollow body and illuminate the conveyed object, the two light sources being respectively mounted at a first pair of diametrically-opposed positions of the hollow body.
  • the two detectors detect resulting light emanating from the conveyed object, and output a signal representative of the resulting light, the two detectors being respectively mounted at a second pair of diametrically- opposed positions of the hollow body.
  • the processor is operatively connected to the two detectors, the processor being configured for receiving the signal representative of the resulting light, and being configured for continuously generating an unwrapped image of the surface of the conveyed object, thereby allowing to planarly represent the surface of the conveyed object.
  • the adjustable rotational speed is included between 0 and 300 RPM.
  • the processor is mounted onto the rotatable drum.
  • the support frame includes a fixed holder, the fixed holder including a slip ring, the slip ring being operatively connected to the drum at the input end section.
  • the hollow body is cylindrical.
  • the system further includes at least one guiding element configured for supporting and guiding the conveyed object.
  • the at least one guiding element is mounted near or at the output end section, and is configured for maintaining the object near a center of the hollow body.
  • the light has a spectral profile including a visible waveband extending from 390 to 800 nm.
  • the two light sources each includes a plurality of light-emitting diodes.
  • each one of the two light sources conforms to a shape of the inner periphery of the drum.
  • the system further includes a diffusing optical component, the diffusing optical component being optically coupled with the two light sources.
  • the diffusing optical component is a diffusing coating provided on a surface of the inner periphery of the drum.
  • each one of the two detectors is a line scan camera.
  • the line scan camera has an X axis and a width extending along the X axis, the width being about 200 mm and having 2048 pixels along the X axis, such that the line scan camera has a spatial resolution of about 0.1 mm/pixel.
  • an acquisition rate of the line scan camera is included between 0 and 2000 lines/second and a bandwidth of the line scan camera is about 4 Mbytes/second.
  • the line scan camera is a monochrome line scan camera.
  • each one of the two detectors is selected from the group consisting of: a 2D optical profiler, a 3D optical profiler, color line scan cameras, a charge coupled device (CCD), and a CMOS camera.
  • a focus, an aperture and a field of view of the two detectors are each individually adjustable.
  • the system further includes a programmable rotary encoder mounted to the drum to clock an image acquisition by the two detectors.
  • the system further includes a control unit including a servo-motor for driving a rotation of the drum.
  • the control unit includes a microcontroller operatively connected to the two light sources, the two detectors and the servo-motor.
  • the drum is placed downstream of a cable stranding machine, the control unit being operatively connected to the stranding machine and being further configured for adjusting the adjustable rotational speed upon reception of information about the conveyed object.
  • the conveyed object is a stranded cable and said information includes a pitch of the stranded cable.
  • the detector includes two detection modules. [0067] In some embodiments, the first pair of diametrically-opposed positions of the hollow body defines a first axis; and the second pair of diametrically-opposed positions of the hollow body defines a second axis, the first axis being substantially perpendicular to the second axis
  • the processor is configured for identifying a defect on the surface of the conveyed object, identifying a number of defects in a portion of the surface of the conveyed object, identifying a minimum/maximum size of the defect in the portion of the conveyed object, and identifying a quantity of a length of conveyed object per unit of time.
  • the system is operatively connected to an operation unit, the processor being remotely connected to the operation unit.
  • the system further includes a wireless network card
  • the operation unit includes a programmable logic controller, the operation unit being remotely connected to the programmable logic controller through the wireless network card.
  • the operation unit is configured for receiving the signal representative of the resulting light from the processor through the wireless network card and is operable to operate the system upon reception of the signal representative of the emanating light.
  • a communication between the processor and the programmable logic controller relies on a communication protocol through an input/output port.
  • the communication protocol is a Modbus TCP/IP protocol.
  • the operation unit further includes an external router and an external computer, the processor being operatively connectable to the external router for transferring results of an analysis from the processor to the router.
  • the external computer includes a user interface and a display for displaying the results of the analysis.
  • the resulting light includes diffusely reflected light produced through diffuse reflection of the light off the object.
  • a method for continuously imaging a surface of an object includes steps of: providing the object within a hollow body of a drum having an inner periphery and a central rotation axis; rotating the drum about the central rotation axis, such that an optical assembly mounted to the drum rotates along with the drum; projecting illumination light towards the inner periphery of drum with the optical assembly; detecting resulting light emanating from the object with the optical assembly; producing a signal representative of the resulting light; processing the signal representative of the resulting light with a processor; and continuously generating an unwrapped image of the surface of the object and planarly representing the surface of the object.
  • the object is being conveyed in a conveying mode, and the step of providing the object includes conveying the object along the central rotation axis extending from an input end section to an output end section of the drum.
  • a system for continuously imaging a surface of an object includes a rotatable device, an optical assembly and a processing unit.
  • the rotatable device has an inner hollow portion for receiving the object and has a longitudinal rotation axis.
  • the inner hollow portion has an inner periphery.
  • the optical assembly is mounted onto the rotatable device and is rotatable about the longitudinal rotation axis.
  • the optical assembly includes an illumination unit and a detection unit.
  • the illumination unit projects illumination light toward the inner periphery of the inner hollow portion and illuminates the object.
  • the detection unit detects object light emanating from the object, and outputs optical data representative of the detected object light.
  • the processing unit is operatively connected to the detection unit. The processing unit receives the optical data from the detection unit and continuously generates an unwrapped image of the surface of the object, thereby allowing to planarly represent the surface of the object.
  • a system for continuously imaging a surface of an object includes a rotatable drum, an optical assembly and a processing unit.
  • the rotatable drum has an inner hollow portion for receiving the object and has a longitudinal rotation axis.
  • the inner hollow portion has an inner periphery.
  • the optical assembly is mounted onto the rotatable device and is rotatable about the longitudinal rotation axis.
  • the optical assembly includes an illumination unit and a detection unit.
  • the illumination unit projects illumination light toward the inner periphery of the inner hollow portion and illuminates the object.
  • the detection unit detects object light emanating from the object, and outputs optical data representative of the detected object light.
  • the processing unit is operatively connected to the detection unit.
  • the processing unit receives the optical data from the detection unit and continuously generates an unwrapped image of the surface.
  • a system for continuously imaging a surface of a conveyed object includes a rotatable drum, an optical assembly and a processing unit.
  • the rotatable drum has an input end, an output end, a longitudinal rotation axis and an inner hollow portion.
  • the longitudinal rotation axis extends from the input end to the output and defines a conveying path.
  • the inner hollow portion receives the conveyed object along the conveying path at the feeding speed.
  • the inner hollow portion has an inner periphery.
  • the optical assembly is mounted onto the rotatable drum and is rotatable about the longitudinal rotation axis at a rotational speed. The rotational speed is proportional to the pitch of the object and to the feeding speed.
  • the optical assembly includes an illumination unit and a detection unit.
  • the illumination unit projects illumination light toward the inner periphery of the inner hollow portion and illuminates the conveyed object.
  • the detection unit detects object light emanating from the conveyed object, and outputs optical data representative of the detected object light.
  • the processing unit is operatively connected to the detection unit. The processing unit receives optical data from the detection unit and continuously generates an unwrapped image of the surface of the object, thereby allowing to planarly represent the surface of the object.
  • a rotatable drum such as described herein for use in a system for continuously imaging a surface of an object.
  • the processing unit is mounted onto the rotatable drum.
  • the rotatable drum has a cylindrical body rotatably mounted to an external support frame and the external support frame is stationary.
  • the system further includes a bearing, and the rotatable drum is mounted to the external support frame through the bearing. [0086] In one embodiment, the system further includes a slip ring located near or at the input end of the rotatable drum and operatively connected to the rotatable drum.
  • the system includes a guiding mechanism comprising at least one guiding element for supporting the object.
  • the at least one guiding element is mounted near the output end of the rotatable drum and maintains the object near the center of the inner hollow portion of the rotatable drum.
  • the illumination light emitted by the illumination unit can have a spectrum encompassing an illuminating waveband that lies in the visible range of the electromagnetic spectrum.
  • the object light emanating from the object is representative of an optical response of the object.
  • the illumination unit is based on light-emitting diodes technology.
  • the illumination unit conforms to the inner periphery of the hollow portion of the rotatable drum.
  • the illumination unit comprises a diffusing surface optically coupled with the illumination unit.
  • the diffusing surface could be an acrylic sheet.
  • the rotatable drum rotates about the longitudinal rotation axis at a rotational speed along a rotational path, thereby rotatably engaging the optical assembly about the object.
  • the rotational speed is comprised between 0 and 300 RPM.
  • the detection unit is a line scan camera.
  • the line scan camera has an X axis and a width extending along the X axis.
  • the line scan camera can have a spatial resolution of about 0.1 mm/pixel (i.e. when the width is about 200 mm and has 2048 pixels along the X axis).
  • the acquisition rate of the line scan camera is comprised between 0 and 2000 lines/second, for example when a resolution of the camera along the rotational path is about 0.1 mm/line.
  • the acquisition rate can be limited by the geometrical properties of the object, as well as the rotational speed of the rotatable drum.
  • the bandwidth of the line scan camera is about 4 Mbytes/second (i.e. 2000 lines/second x 2048 pixels x 1 byte).
  • the line scan camera is a monochrome line scan camera.
  • the detection unit could be a 2D or a 3D optical profilers, color line scan cameras, a charge coupled device (CCD), a CMOS camera, or any other cameras, devices and/or sensors allowing to detect and visualize the information constituting an image.
  • the focus, aperture and the field of view of the detection unit are individually adjustable.
  • the detection unit is optically coupled with optical components.
  • the rotational speed of the rotatable drum is adjustable and is adjusted according to the geometrical properties of the object, such as its shape and/or dimension.
  • the system comprises a programmable rotary encoder mounted onto the rotatable drum to clock image acquisition.
  • the programmable rotary encoder is in contact with the external support frame and is operatively connected with at least one optocoupler.
  • the system includes a control unit including a servomotor for rotating the rotatable drum.
  • the control unit includes a microcontroller operatively connected to at least one of the following: the illumination unit, the detection unit and the servo-motor.
  • the detection unit and the processing unit are combined into a single integrated device, such as a smart camera.
  • the spectral detection unit and the processing unit can be part of a smart line scan camera.
  • the illumination unit includes two illumination modules and the detection unit includes two detection modules.
  • the two illumination modules are mounted at a first pair of diametrically opposed points of the rotatable drum and the first pair of diametrically opposed points defines a first axis.
  • the two detection modules are mounted at a second pair of diametrically opposed points of the rotatable drum and the second pair of diametrically opposed points defines a second axis.
  • the first axis is substantially perpendicular to the second axis.
  • the detection unit and the processing unit are two independent interconnected devices.
  • the illumination unit, the detection unit, the processing unit and the control unit are combined into a single integrated device.
  • the illumination unit, the detection unit, the processing unit and the control unit are independent interconnected devices.
  • the processing unit is configured for performing at least one of the following analysis: identifying a defect on the surface of the object, identifying the number of defects in a portion of the surface of the object, identifying the minimum/maximum size of the defect(s) in the portion of the object and/or identifying a quantity of the imaged object per unit of time (i.e. a length of the conveyed object per minute).
  • the system is operatively connected to an operation unit and the processing unit is remotely connected to the operation unit.
  • the operation unit includes a programmable logic controller and the operation unit is remotely connected to the programmable logic controller through a wireless network card.
  • the operation unit is configured for receiving the optical data from the processing unit through the wireless network card and is operable to operate the system upon reception of the optical data.
  • results of the analysis are sent from the processing unit to the programmable logic controller using a communication protocol (i.e. Modbus TCP/IP) through an input/output port.
  • a communication protocol i.e. Modbus TCP/IP
  • the results of the analysis can be sent from the processing unit to the operation unit using discrete signals.
  • the operation unit further includes an external router and an external computer.
  • the processing unit is operatively connectable to the external router.
  • the wireless network card can transfer the results of the analysis from the processing unit to the router.
  • the router is operatively connected to the microcontroller, the input/output port and the external computer.
  • the external computer includes a user interface and a display for displaying the results of the analysis.
  • the object light includes diffusely reflected light produced by diffuse reflection of the illumination light off the object.
  • the system can include a stranding machine for stranding cables near the input end of the rotatable drum.
  • the object is a stranded cable which is conveyed along the conveying path after being stranded by the stranding machine.
  • the stranded cable is conveyed along the conveying path at a feeding speed and has a stranding pitch.
  • the rotational speed of the rotatable drum rotating about the longitudinal rotation axis is proportional to the feeding speed and to the stranding pitch of the stranded cable.
  • control unit is operatively connected to the stranding machine and is configured for adjusting the rotational speed of the rotatable drum upon reception of information provided by the stranding machine.
  • the rotational speed can be adjusted so as to be proportional to the feeding speed of the stranding machine.
  • the processing unit is configured for adjusting at least one of the following parameter of the analysis: pitch of the stranded cable, diameter of the cable, material(s) forming the cable (e.g. aluminum or copper), maximum size of the defect(s) accepted, defect detection threshold (i.e. minimal size of the defect(s)), statistical analysis to be performed onto the stranded cable and/or acquisition rate or resolution (i.e. in mm/line).
  • a method for continuously imaging a surface of an object includes steps of providing the object within an inner hollow portion of a rotatable drum having an inner periphery and having a longitudinal rotation axis, rotating the rotatable drum about the longitudinal rotation axis, projecting illumination light towards the inner periphery of the inner hollow portion, rotary detecting object light emanating from the object, and outputting optical data representative of the detected object light, processing the optical data representative of the detected object light, and continuously generating an unwrapped image of the surface of the object, thereby allowing to planarly represent the surface of the object.
  • the object is a conveyed object and the step of providing the object includes a sub-step of conveying the object along a conveying path extending from an input end to an output end of the rotatable drum.
  • the detecting step includes detecting the object light as diffusely reflected light. In other embodiments, the detecting step includes detecting the object light as specularly reflected light.
  • Figures 1 A and 1 B show schematic representations of a front view and a side view of a system for continuously imaging a surface of an object according to one embodiment.
  • Figures 2A and 2B show different views of a system for continuously imaging a surface of a conveyed object according to one embodiment.
  • Figure 3A and 3B illustrate different views of the system of Figure 2.
  • Figure 4 shows a schematic representation of a system remotely connected to an operation unit according to one embodiment.
  • Figure 5 is an unwrapped image of a surface of an object obtained with a system for continuously imaging a surface of an object, according to one embodiment.
  • Figures 6A and 6B illustrate images of a defect detected on the surface of a cable.
  • connection or coupling refers to any connection or coupling, either direct or indirect, between two or more elements.
  • the connection or coupling between the elements may be mechanical, physical, optical, operational, electrical, wireless, or a combination thereof.
  • optical assembly refers to an apparatus configured to illuminate the surface of an object and acquire images representative of the surface of the object.
  • the optical system could further be understood as a device configured to sense and/or probe light reflected by the surface of the object, according to the needs of a particular application.
  • the optical assembly may provide clear and undistorted images of objects having an outer circular surface.
  • the terms “light” and “optical”, and any variants and derivatives thereof, are intended to refer to electromagnetic radiation in any appropriate region of the electromagnetic spectrum, and are not limited to visible light.
  • the terms “light” and “optical” may encompass electromagnetic radiation with a wavelength ranging from about 390 to 800 nm. More particularly, although one embodiment of the present techniques can be useful in visible range applications, other embodiments could additionally or alternatively operate in other regions of the electromagnetic spectrum, for example in the millimeter, terahertz, infrared and ultraviolet regions.
  • object having a curved or circular surface encompasses any objects having a substantially tubular, filiform or spherical shape, or having a substantially circular cross-section. More particularly, the expression may refer, but is not limited to any objects whose outer surface has a non-null curvature (i.e., is not flat).
  • the object is a cable. In other embodiments, the cable is a stranded cable.
  • Some embodiments of the present invention may be particularly useful in the field of active imaging (i.e., "continuous” and “real-time” imaging).
  • the embodiments described below are designed for carrying out tasks of material surface inspection, and more particularly non-destructive inspection, testing or evaluation, when, for example, the surface of the object (or the surface of a conveyed object) to be inspected may comprise defects distributed onto its surface.
  • the system may be used in the field of imaging stranding cable suitable for high-voltage application. Alternatively, the system may be used in any other industry wherein active imaging of a circular surface may be useful.
  • the expression “real-time imaging” refers to the acquisition of information and/or results that are continuously available for processing, recording and analysis.
  • the expression “real-time acquisition”, or the like can refer, in some context, to "near real-time acquisition”.
  • the present description generally relates to techniques for optical imagery, defects identification and discrimination of objects based on such defects identification. More particularly, the present techniques generally involve generating an image of the surface of the object and performing statistical analysis on the generated image.
  • the term "object” is meant to encompass broadly any structure, feature or information of interest which is to be imaged using the present systems, methods and techniques.
  • the object can be a cable, a stranded cable, a rope, a fiber, or any other element having an outer circular surface.
  • Pitch also referred to as “lay length” refers to a distance in a straight line for a wire to make one complete spiral around the center
  • “Cable” refers to multiple strands laid together helically and being symmetrically arranged, for example in multiple layers with a substantially uniform pitch.
  • the term "cable” and variants thereof may also be understood herein as any elements having a filiform shape (i.e., having a length substantially larger than a width).
  • the term “cable” is not meant to be restricted with respect to size, composition or geometrical properties.
  • one embodiment may be suited for imaging cables having a diameter ranging from about 10 to 50 mm, although other sizes may be envisioned in other embodiments.
  • the cable can be made from aluminum or copper.
  • the cable can be a stranded cable (compact-type or compress-type) and comprise, for example 10 to 25 strands.
  • Each strand may have a pitch (i.e., the length that a strand takes to make a complete winding around the cable, i.e., 360 degrees with respect to its cross-section) of about 133 and 320 mm.
  • a pitch i.e., the length that a strand takes to make a complete winding around the cable, i.e., 360 degrees with respect to its cross-section.
  • the above-mentioned composition, number of strands and pitch of the cables serve as exemplary purposes only, and should not be considered as limitative.
  • the object or cables being inspected by the system may be composed of various kinds of materials including, without limitation, metals, alloys, semiconductors, plastics, ceramics, glasses, fibers and/or organic materials.
  • the object being inspected can either be imaged while being at rest or in movement (i.e., while being conveyed).
  • the object to be imaged will simply be referred to as "object”.
  • the system will be said to be in a conveying mode, and the object is then conveyed along a conveying path, as described in greater detail below, and so will be referred to as a "conveyed object”.
  • conveyed or not does not put any restrictions onto the embodiments which will be described below, and so the two terms may be used interchangeably.
  • the system 20 includes a support frame 26, a drum 27 (sometimes referred to as "a rotatable device"), an optical assembly 34 and a processor 44.
  • the drum 27 has a hollow body 28 for receiving the object 24 and a central rotation axis 30 typically passing through the hollow body 28. More particularly, the hollow body 28 has an input end section 50, an output end section 52, and the central rotation axis 30 extends through the input end section 50 and the output end section 52.
  • the drum 27 When operated in the conveying mode, the drum 27 is drivable to rotate about the central rotation axis 30.
  • the system 20 is configured to receive a conveyed object 24
  • the hollow body 28 also has an inner periphery 32, and the inner periphery 32 has a reflective surface.
  • the reflective surface is made of a material which can provide, for example, a reflection of light, or other types of radiation.
  • the drum 27 can have various dimensions and different geometrical configuration.
  • the drum 27 can have a length that ranges between 20 and 80 cm, and a diameter that ranges between 30 and 150 cm.
  • other dimensions can be used in other alternative embodiments.
  • the diameter of the rotatable drum can be adjusted in view of a desired length for the conveying path 54.
  • the drum 27 is cylindrical, i.e., has a cylindrical body 46. It will however be readily understood that the drum could alternatively have a different shape or configuration.
  • the drum 27 further has an input end section 50 and an output end section 52. It is to be noted that the central rotation axis 30 extends from the input end 50 to the output end 52, and hence defines the conveying path 54, i.e., a trajectory followed by the object being conveyed in the hollow body 28 of the drum 27.
  • the input end section 50 is configured to supply, inject, dispose, transfer or arrange the object 24 to be characterized onto inner hollow portion 28 of the drum 27. As illustrated, the input end section 50 is an open extremity of the hollow body 28, so as to admit a passage of the object 24 therethrough. In some implementations, the input end 50 may be provided downstream of a stranding machine or a storing unit (not shown, i.e., a cable coil) for storing the objects 24 and supplying the object 24 to the input end 50.
  • the output end section 52 is configured to let the object 24 pass after its inspection by the optical assembly 34. As illustrated, the output end section 52 is an open extremity of the hollow body 28, so as to admit a passage of the object 24 therethrough.
  • the speed of the conveyed object 24 along the conveying path 54, i.e., through the hollow body 28 from the input end section 50 to the output end section 52 is adjustable. For example, it can range from about 0 to 500 mm/s (i.e., about 0 to 30 m/min). The speed of the conveyed object 24 can be selected so different detectors 40 may be used.
  • the support frame 26 comprises a fixed holder 56.
  • the system 20 includes aa slip ring 58.
  • the slip ring 58 is herein refer to as an electromechanical device (and variants thereof) configured for transmitting power and/or other electrical signals from the fixed holder 56 to the drum 27.
  • the slip ring 58 allows to drive the drum 27 in rotation while transmitting power or signals to, for example and without being limitative, the optical assembly 34 and the processor 40 provided on the drum 27.
  • the slip ring 58 is located near or at the input end 50 of the drum 27. In such a scenario, the slip ring 58 is operatively connected with the drum 27. More particularly, the slip ring 58 is mounted at an interface between a fixed (i.e., stationary) portion of the support frame 26 and a mobile portion of the support frame 26, such that the drum 27 can rotate when driven by appropriate means.
  • the system 20 also includes a stand 48.
  • the stand 48 is stationary (i.e., remains in a fixed position, or alternatively, does not rotate), and is configured for supporting, for example and without being limitative, the fixed holder 56, as well as the drum 27, the optical assembly 34 and the processor 40.
  • the system 20 includes at least one guiding element 60 (sometimes referred to as a "guiding mechanism").
  • the guiding element 60 is configured for guiding and supporting the object 24.
  • the guiding element 62 can be mounted near the output end 52 of the drum 27 and be positioned such that it maintains the object 24 near a center region (for example, the tolerated deviation may be of about +/- 1 mm) of the hollow body 28 of the drum 27.
  • the configuration and positioning of the guiding element 60 can be advantageous when imaging the object as it is being conveyed, as the guiding element 60 allows stabilizing the object 24 during the optical measurements (i.e., inspection) by the optical assembly 34, which can facilitate locating defects onto the surface 22 of the object 24 by facilitating, for example and without being limitative, the acquisition of a relatively stabilized image.
  • the optical assembly 34 is mounted onto the drum 27, such that the optical assembly 34 rotates along with the drum 27 in the conveying mode. More particularly, when the object 24 is conveyed at a feeding speed in the conveying mode, the drum 27 is configured to rotate at an adjustable rotational speed, the adjustable rotational speed being proportional to the feeding speed.
  • the optical assembly 34 includes a light source 36.
  • the light source 36 is configured and positioned for generating and projecting light 38 toward the inner periphery 32 of the hollow body 28, hence illuminating the object 24 inside the hollow body 28 or as it is conveyed along the conveying path 54.
  • the optical assembly 34 also includes a detector 40.
  • the detector 40 is configured and positioned for detecting resulting light 42 emanating from the object 24, and outputting a signal representative of the resulting light 42, after its detection.
  • the light has a spectrum encompassing an illuminating waveband that lies, for example, in the visible range of the electromagnetic spectrum.
  • the resulting light 42 emanating from the object 24 is representative of an "optical response" of the object 24.
  • the light source 36 is based on light-emitting diodes technology. Alternatively, different lighting technologies could be used such as, for example, solid-state lighting including lasers, light-emitting diodes (LEDs) and organic LEDs (OLEDs), incandescent lighting, halogen lighting, fluorescent light, and discharge lighting.
  • LEDs light-emitting diodes
  • OLEDs organic LEDs
  • the light source 36 can conform to a shape of the inner periphery 32 of the hollow body 28 of the drum 27.
  • the system 20 can further comprise a diffusing optical component.
  • the diffusing optical component is optically coupled with the light source 36.
  • the diffusing optical component includes a diffusing surface (not shown).
  • the diffusing optical surface is a diffusing coating provided on a surface of the inner periphery 32 of the drum 27.
  • the diffusing optical component could be an acrylic sheet.
  • the light source 36 is typically configured for emitting light in a continuous regime. It will however be readily understood that the light source 36 could be operated either in a continuous regime or an intermittent regime, according to one's needs or the targeted applications. Some factors may also influence the configuration of the light source 36, such as the wavelength, power, spatial and spectral profiles of the light 38. In some targeted application, it may be useful to operate the light source 36 so as it generates low power and diffused light 38, which may limit, for example, optical effect (i.e., the formation of hotspots or unwanted light reflection) into the object 24.
  • optical effect i.e., the formation of hotspots or unwanted light reflection
  • the light source 36 could be coupled to optical components (not shown) configured to alter at least some of the properties of the light 38 prior to its interaction with the object 24.
  • optical components herein refers, but is not limited to: lenses, mirrors, filters, and other suitable reflective, refractive and/or diffractive optical components.
  • the position of the light source 36 may also be adjustable, for example if it is required or could be more efficient to control the irradiance of the light 38 on the object 24.
  • the detector 40 is configured to detect light 42 emanating from the object upon its irradiation by the light 38.
  • detector broadly refer to any optical detector or combination of optical detectors for measuring light emanating from the object that can be used for optical inspection purposes.
  • the expression "light emanating from” is herein generally understood as any light which has interacted with the object 24 prior to its detection by detector 40, and so may result from absorption- reemission, fluorescence emission and/or nonlinear optical processes.
  • the resulting light 42 may represent a portion of the illumination light 48 that was not totally absorbed by the object 24 and that was at least partially reflected by the object 24.
  • the detector 40 can comprise or be coupled with optical components which have been previously described for altering the resulting light 42.
  • the drum 27 rotates about the central rotation axis 30 at a rotational speed along a rotational path 68, thereby rotatably engaging the optical assembly 34 (and so the light source 36 and the detector 40) about the object 24.
  • the detector 40 is a line scan camera 64.
  • the line scan camera has an X axis and a width extending along the X axis.
  • the line scan camera 64 can have, for example, a spatial resolution of about 0.1 mm/pixel (i.e., when the width is about 200 mm and has 2048 pixels along the X axis).
  • the acquisition rate of the line scan camera can be comprised between 0 and 2000 lines/second, for example when a resolution of the camera along the rotational path is about 0.1 mm/line.
  • the acquisition rate can be limited by the geometrical properties of the object 24, as well as the rotational speed of the drum 27.
  • the bandwidth of the line scan camera is about 4 Mbytes/second (i.e. 2000 lines/second x 2048 pixels x 1 byte).
  • the line scan camera is a monochrome line scan camera.
  • the detection unit could be a 2D or a 3D optical profilers, color line scan cameras, a charge coupled device (CCD), a CMOS camera, or any other cameras, devices and/or sensors allowing to detect and visualize the information constituting an image.
  • CCD charge coupled device
  • CMOS camera or any other cameras, devices and/or sensors allowing to detect and visualize the information constituting an image.
  • the drum 27 may comprise at least one slot 66 substantially aligned with at least a portion of the field of view 65 of the line scan camera 64, i.e., the field of view 65 of the line scan camera 64 encompasses the slot 66.
  • the slot 66 is substantially aligned with the line scan camera 64, as the camera rotates about the longitudinal axis 30.
  • the line scan camera 64 has focus, a field of view 65 and an aperture.
  • the focus, field of view 65 and the aperture of the line scan camera 64 are adjustable, according to principles well known by one skilled in the art.
  • the resulting light 42 typically includes diffusely reflected light produced by diffuse reflection of the illumination light off the object 24.
  • the rotational speed of the drum 27, (and so of the optical assembly 34, is comprised between 0 and 300 RPM. Of course, this interval may vary according to one's needs or according to the targeted applications.
  • the system 20 more particularly allows adjusting the rotational speed of the drum 27 according to the geometrical properties of the object 24, such as its shape and/or dimension, and as to accommodate to the properties of the object 24 which have been previously described.
  • the light source 36 includes two linear dome light sources 70,72 (sometimes referred to as "illumination modules") and the detector 40 includes two detection modules 74,76.
  • the two linear dome light sources 74, 76 are mounted at a first pair of diametrically opposed positions 78,80 of the drum 27 and the first pair of diametrically opposed points defines a first axis 82.
  • the two detection modules are mounted at a second pair of diametrically opposed positions 84,86 of the drum 27 and the second pair of diametrically opposed points defines a second axis 88.
  • the first axis 82 is substantially perpendicular to the second axis 88.
  • a heat sink 89 is provided onto the drum 27.
  • the heat sink 89 can be in thermal contact with at least one of the following: the light 36, the detector 40 and the processor 44.
  • the processor 44 is mounted onto the drum 27 and operatively connected to the detector 40.
  • the processor 44 is configured for receiving a signal representative of the resulting light 42 from the detector 40 and continuously generating an image representative of the surface 22 of the object 24.
  • the system 20 allows generating a planar image of the circular surface 22 of the object 24, and so allows generating an "unwrapped image” (e.g. a linear image representing an unwrapped strand of a cable) of the circular surface 22.
  • the "unwrapped image” may help locating the presence of defects on the surface 22 of the object. 24.
  • the processor 44 is configured for performing at least one of the following operations: identifying a defect on the surface of the object 24, identifying the number of defects in a portion of the surface 22 of the object 24, identifying the minimum/maximum size of the defect(s) in the portion of the object 24 and/or identifying a quantity of the imaged object 24 per unit of time (i.e., the length of the conveyed object per minute).
  • identifying a defect on the surface of the object 24 identifying the number of defects in a portion of the surface 22 of the object 24, identifying the minimum/maximum size of the defect(s) in the portion of the object 24 and/or identifying a quantity of the imaged object 24 per unit of time (i.e., the length of the conveyed object per minute).
  • the general principles underlying such operation are generally well known to one skilled in the art.
  • the processor 44 can be implemented as a single unit or as a plurality of interconnected processing sub-units.
  • the processing unit can be embodied by a computer, a microprocessor, a microcontroller, a central processing unit, or by any other type of processing resource or any combination of such processing resources configured to operate collectively as a processing unit.
  • the processor 44 can be implemented in hardware, software, firmware, or any combination thereof, and be connected to the various components of the spectral identification system via appropriate communication ports.
  • the system 20 comprises a programmable rotary encoder 90 mounted onto the drum 27 to clock the image acquisition.
  • the programmable rotary encoder 90 is in contact with the external fixed holder 56 and is operatively connected with at least one optocoupler 92.
  • the programmable rotary encoder 90 can be provided with a 24 VDC power supply (not illustrated).
  • the system 20 may comprise two optocouplers 92 operatively connected to the programmable rotary encoder 90, for sharing the electrical signal between the two detection modules 74,76.
  • the control unit 94 may include a microcontroller 98 operatively connected to at least one of the following: the light source 36, the detector 40 and a servomotor 96.
  • the detector 40 and the processor 44 are combined into a single integrated device.
  • the detector 40 and the processor 44 can be part of a smart line scan camera 64.
  • the detector 40 and the processor 44 are two independent interconnected devices.
  • the light source 36, the detector 40, the processor 44 and the control unit 94 are combined into a single integrated device.
  • the light source 36, the detector 40, the processor 44 and the control unit 94 are independent interconnected devices.
  • the system 20 is operatively connected to an operation unit 100.
  • the operation unit is configured for operating the system 20 and/or a production line of the object 24.
  • the processor 44 is remotely connected to the operation unit 100.
  • the operation unit 100 includes a programmable logic controller 102 and the operation unit 100 is remotely connected to the processor 44 through a wireless network card 104 (included in the system 20).
  • the operation unit 100 is typically configured for receiving the optical data from the processor 44 through the wireless network card 104 and is operable or used to operate the system 20 upon reception of the optical data. For example, in a scenario where a defect is detected on the surface 22 of the object 24, the operation unit 100 may be useful for stopping the system 20 (or the production line of the object 24), which allows a user to interact (i.e. insert a new object or remove the object 24 from the system 20) in a non-hazardous, safe, and efficient manner.
  • the results of the analysis are sent from the processor 44 to the programmable logic controller 102 using a communication protocol (e.g. , Modbus TCP/IP) through an input/output port 106, following steps that are well known by one skilled in the art.
  • a communication protocol e.g. , Modbus TCP/IP
  • the results of the analysis can be sent from the processor 44 to the operation unit 102 using discrete signals.
  • the operation unit 100 further includes an external router 108 and an external computer 1 10 operatively connected to the router 108.
  • the processor 44 is operatively connected to the external router 108.
  • the wireless network card 104 can transfer the results of the analysis from the processor 44 to the router 108.
  • the router 108 is operatively connected to at least one of the microcontroller 98, the input/output port 106 and the external computer 1 10.
  • the external computer 1 10 includes a user interface and a display for displaying the results of the analysis and the image of the surface 22 of the object 24.
  • the external computer 1 10 may allow the user to operate (interact with) the system 20.
  • Such configuration may be useful for the operator controlling, i.e., starting, stopping and/or adjusting parameters of the system 20 or the line of production of the object 24, based on the image displayed on the computer 1 10 screen, as well as selecting properties of the object 24 to be imaged (and the associated required analysis parameters).
  • the system 20 can include or be mounted near a stranding machine (not shown) for stranding cables.
  • the stranding machine is located near the input end section 50 of the drum 27 and the object 24 is a stranded cable which is conveyed along the conveying path 54 after being stranded (i.e. "formed") by the stranding machine.
  • the stranded cable is conveyed along the conveying path 54 at a feeding speed and has a stranding pitch.
  • the feeding speed of the cable (at the input end 50) is typically comprised between 0 to 500 mm/s, but may of course vary according to some of the characteristics of the object 24.
  • the adjustable rotational speed of the drum 27 rotating about the longitudinal rotation axis 30 is proportional to the feeding speed and to the stranding pitch of the stranded cable.
  • the operation unit 100 is operatively connected to the stranding machine and is configured for adjusting the rotational speed of the drum 27 upon reception of information provided by the stranding machine.
  • the processor 44 is configured for adjusting at least one of the following parameters of the analysis: pitch of the stranded cable, diameter of the cable, material(s) forming the cable (e.g., aluminum or copper), maximum size of the defect(s) accepted, defect detection threshold (i.e., minimal size of the defect(s)), statistical analysis to be performed onto the stranded cable and/or acquisition rate or resolution (i.e., in mm/line).
  • pitch of the stranded cable e.g., diameter of the cable, material(s) forming the cable (e.g., aluminum or copper), maximum size of the defect(s) accepted, defect detection threshold (i.e., minimal size of the defect(s)), statistical analysis to be performed onto the stranded cable and/or acquisition rate or resolution (i.e., in mm/line).
  • defect detection threshold i.e., minimal size of the defect(s)
  • statistical analysis to be performed onto the stranded cable i.e., in mm/line.
  • planar image 1 12 may be useful to visually inspect the surface of the stranded cable.
  • the cable is typically composed of a plurality of strand surfaces 1 14, and each strand surface 1 14 is separated from its neighboring strand surface 1 14 by a cavity 1 16.
  • the system 20 allows to obtain a clear and relatively undistorted two-dimensional representation a three-dimensional object in real-time or in near real-time.
  • the system 20 continuously generates an unwrapped image of the surface of the object being inspected and further planarly represents the surface of the object.
  • the planar image 1 12 facilitate the visual inspection of the cable.
  • a defect 1 18, which could be, for example and without being limitative, the adhesive material leaking between each of the strand surfaces 1 14 and protruding from the cavity 1 16 may be more easily identified by a visual recognition system or by an operator.
  • the system is configured for continuously imaging a surface of a conveyed object.
  • the conveyed object has a pitch and can be conveyed at a feeding speed.
  • the system includes a drum.
  • the drum has an input end section and an output end section; a central rotation axis extending from the input end section to the output end section and defining a conveying path; and a hollow body for receiving the conveyed object along the conveying path at the feeding speed.
  • the hollow body has an inner periphery.
  • the system also includes an optical assembly mounted to the drum.
  • the optical assembly is rotatable about the central rotation axis at an adjustable rotational speed.
  • the adjustable rotational speed is proportional to the pitch of the conveyed object and to the feeding speed.
  • the optical assembly includes two light sources and two detectors.
  • the two light sources project light toward the inner periphery of the hollow body and illuminate the conveyed object.
  • the two light sources are respectively mounted at a first pair of diametrically-opposed positions of the hollow body.
  • the two detectors detect resulting light emanating from the conveyed object and output a signal representative of the resulting light.
  • the two detectors are respectively mounted at a second pair of diametrically-opposed positions of the hollow body.
  • the system according to this implementation further includes a processor operatively connected to the two detectors.
  • the processor receives the signal representative of the resulting light, and is configured for continuously generating an unwrapped image of the surface of the conveyed object, thereby allowing to planarly represent the surface of the conveyed object.
  • the present description also relates to a method for continuously imaging an object or a cable, as well as a method for continuously imaging a conveyed object (e.g. a cable). Such methods can be performed with the system such as described above.
  • the method includes steps of providing the object within a hollow body of a drum having an inner periphery and a central rotation axis; rotating the drum about the central rotation axis, such that an optical assembly mounted to the drum rotates along with the drum; projecting light towards the inner periphery of drum with the optical assembly; detecting resulting light emanating from the object with the optical assembly; producing a signal representative of the resulting light; processing the signal representative of the resulting light with a processor; and continuously generating an unwrapped image of the surface of the object and planarly representing the surface of the object.
  • the object is being conveyed in a conveying mode
  • the step of providing the object includes a sub-step of conveying the object along the central rotation axis extending from an input end section to an output end section of the drum.
  • the method includes a step of providing an object within a hollow body of a drum having an inner periphery and having a longitudinal rotation axis.
  • the method includes a step of rotating the rotatable drum about the longitudinal rotation axis, and also includes a step of projecting illumination light towards the inner periphery of the inner hollow portion with an optical assembly.
  • the method further includes a step of detecting, with a detector, resulting light emanating from the object as the drum and the optical assembly rotates about the longitudinal rotation axis, and outputting a signal or optical data representative of the resulting light.
  • the method further includes a step of processing the signal or the optical data representative of the resulting light.
  • the method includes a step continuously generating an unwrapped image of the surface of the object. The above-mentioned step may allow, for example, to planarly represent the surface of the object.
  • the detecting step can include detecting the object light as diffusely reflected light. In other embodiments, the detecting step includes detecting the object light as specularly reflected light.
  • the method further includes a step of selecting properties of the object, a step of displaying the image of the surface of the object, and a step of stopping the system if a defect is detected onto the surface of the object.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)

Abstract

La présente invention concerne un système d'imagerie en continu d'une surface d'un objet. Le système comprend un cylindre monté sur un cadre de support et ayant une périphérie interne et un corps creux pour recevoir l'objet à travers celui-ci. Le corps creux comporte des sections d'extrémité d'entrée et d'extrémité de sortie, et un axe de rotation central s'étendant à travers les sections d'extrémité d'entrée et de sortie. Le cylindre peut être entraîné pour tourner autour de l'axe de rotation central dans un mode de transport. Le système comprend un ensemble optique comprenant une source de lumière et un détecteur monté sur le cylindre, de sorte que l'ensemble optique tourne avec le cylindre dans le mode de transport. Le système comprend en outre un processeur configuré pour traiter un signal représentatif d'une lumière résultante provenant de l'objet, de façon à générant en continu une image non enveloppée de la surface de l'objet et représentant de façon plane la surface de l'objet.
PCT/CA2018/050505 2017-05-01 2018-04-30 Système et procédé pour l'imagerie optique continue d'une surface d'un objet Ceased WO2018201238A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201762492620P 2017-05-01 2017-05-01
US62/492,620 2017-05-01

Publications (1)

Publication Number Publication Date
WO2018201238A1 true WO2018201238A1 (fr) 2018-11-08

Family

ID=64015961

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CA2018/050505 Ceased WO2018201238A1 (fr) 2017-05-01 2018-04-30 Système et procédé pour l'imagerie optique continue d'une surface d'un objet

Country Status (1)

Country Link
WO (1) WO2018201238A1 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111257321A (zh) * 2018-11-30 2020-06-09 泰科电子(上海)有限公司 线缆检测设备
CN112649440A (zh) * 2020-12-19 2021-04-13 郑州东辰科技有限公司 一种线缆表面毛刺检测装置
CN113474617A (zh) * 2018-11-14 2021-10-01 艾福泰克公司 位置检测器、门打开检测装置及相关方法
CN114113105A (zh) * 2021-11-12 2022-03-01 宁波新胜中压电器有限公司 一种电缆接头的检测设备及检测方法
IT202100021662A1 (it) * 2021-08-10 2023-02-10 Lasertecno S R L Dispositivo per il controllo ottico di un difetto su una superficie esterna di un corpo estruso o laminato di grande lunghezza, assieme di controllo e metodo
IT202100021650A1 (it) * 2021-08-10 2023-02-10 Lasertecno S R L Dispositivo per il controllo ottico di una marcatura su un cavo o un corpo estruso di grande lunghezza, assieme di controllo e metodo
WO2023017409A1 (fr) * 2021-08-10 2023-02-16 Lasertecno S.R.L. Dispositif de contrôle optique de marque ou de défaut sur un câble ou un corps extrudé de grande longueur, ensemble de commande et procédé
CN115791808A (zh) * 2023-01-09 2023-03-14 江苏云舟通信科技有限公司 电缆检验数据无线通信传输平台
EP4321837A1 (fr) * 2022-08-10 2024-02-14 Nexans Procédé pour déterminer la qualité d'une surface de câble
EP4715373A1 (fr) * 2024-09-23 2026-03-25 Komax Singapore Pte. Ltd. Système d'inspection de câble

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4358202A (en) * 1980-07-28 1982-11-09 Essex Group, Inc. Apparatus and method for monitoring the surface character of circular objects
US4887155A (en) * 1986-12-06 1989-12-12 Robert Massen Method and arrangement for measuring and/or monitoring properties of yarns or ropes
US20060098200A1 (en) * 2004-11-06 2006-05-11 Saurer Gmbh & Co. Kg Yarn sensor
US20070246643A1 (en) * 2004-07-16 2007-10-25 Jean-Fancois Fardeau Surface Analysis of an Elongated Object
US8844387B1 (en) * 2010-07-09 2014-09-30 General Construction Company, Inc. Inspection sled

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4358202A (en) * 1980-07-28 1982-11-09 Essex Group, Inc. Apparatus and method for monitoring the surface character of circular objects
US4887155A (en) * 1986-12-06 1989-12-12 Robert Massen Method and arrangement for measuring and/or monitoring properties of yarns or ropes
US20070246643A1 (en) * 2004-07-16 2007-10-25 Jean-Fancois Fardeau Surface Analysis of an Elongated Object
US20060098200A1 (en) * 2004-11-06 2006-05-11 Saurer Gmbh & Co. Kg Yarn sensor
US8844387B1 (en) * 2010-07-09 2014-09-30 General Construction Company, Inc. Inspection sled

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113474617A (zh) * 2018-11-14 2021-10-01 艾福泰克公司 位置检测器、门打开检测装置及相关方法
CN111257321A (zh) * 2018-11-30 2020-06-09 泰科电子(上海)有限公司 线缆检测设备
US11403743B2 (en) * 2018-11-30 2022-08-02 Tyco Electronics (Shanghai) Co. Ltd. Cable detection apparatus
CN111257321B (zh) * 2018-11-30 2023-07-28 泰科电子(上海)有限公司 线缆检测设备
CN112649440A (zh) * 2020-12-19 2021-04-13 郑州东辰科技有限公司 一种线缆表面毛刺检测装置
CN112649440B (zh) * 2020-12-19 2024-08-16 广东能洋电力建设有限公司 一种线缆表面毛刺检测装置
IT202100021650A1 (it) * 2021-08-10 2023-02-10 Lasertecno S R L Dispositivo per il controllo ottico di una marcatura su un cavo o un corpo estruso di grande lunghezza, assieme di controllo e metodo
WO2023017409A1 (fr) * 2021-08-10 2023-02-16 Lasertecno S.R.L. Dispositif de contrôle optique de marque ou de défaut sur un câble ou un corps extrudé de grande longueur, ensemble de commande et procédé
IT202100021662A1 (it) * 2021-08-10 2023-02-10 Lasertecno S R L Dispositivo per il controllo ottico di un difetto su una superficie esterna di un corpo estruso o laminato di grande lunghezza, assieme di controllo e metodo
CN114113105A (zh) * 2021-11-12 2022-03-01 宁波新胜中压电器有限公司 一种电缆接头的检测设备及检测方法
EP4321837A1 (fr) * 2022-08-10 2024-02-14 Nexans Procédé pour déterminer la qualité d'une surface de câble
CN115791808A (zh) * 2023-01-09 2023-03-14 江苏云舟通信科技有限公司 电缆检验数据无线通信传输平台
EP4715373A1 (fr) * 2024-09-23 2026-03-25 Komax Singapore Pte. Ltd. Système d'inspection de câble
WO2026062613A1 (fr) * 2024-09-23 2026-03-26 Komax Singapore Pte. Ltd. Système d'inspection de câbles

Similar Documents

Publication Publication Date Title
WO2018201238A1 (fr) Système et procédé pour l'imagerie optique continue d'une surface d'un objet
US9188545B2 (en) Container inspection apparatus and method
CN102944928B (zh) 一种三维内窥镜及其三维重建方法
JP2010164588A (ja) 測定面を照明するための装置、ならびに物体の視覚的特性を特定するための装置および方法
TW201312101A (zh) 太陽電池單元檢查裝置
BR112013033824B1 (pt) Inspeção ótica de recipientes
GB2473230A (en) Automated cigarette production line inspection apparatus using a contact image sensor to examine a rotating smoking article
CN100547394C (zh) 基于图像信息融合技术的水果品质检测系统
WO2012080686A1 (fr) Appareil de formation d'image de caractéristiques d'une tige
KR101850336B1 (ko) 회전 비전 검사 시스템 및 회전 비전 검사 방법
US8786300B2 (en) Probe assembly and methods for use in inspecting a component
CN102798515A (zh) 灯具空间光谱分布快速测量装置与方法
CN103720459B (zh) 一种基于单滑环和无线控制激发光扫描的荧光分子断层成像装置及方法
CN205665177U (zh) 线缆护套表面瑕疵检测仪
KR102493209B1 (ko) Ai 기반 외관검사시스템용 영상검출장치
JP2016148598A (ja) カシメ端子などの物品の外周撮影装置、それを有する外観検査装置及び端子圧着電線製造方法
EP4243670A1 (fr) Système d'endoscope rotatif comportant un tube d'insertion rotatif
US20150211982A1 (en) High speed magnetic oscillating device
HUP0402119A2 (hu) Eljárás és berendezés folyékony terméket tartalmazó csomagolásokon történő mérések elvégzésére
JP6672897B2 (ja) 検査装置及び回転体の検査方法
KR102456998B1 (ko) 폴리곤미러 기반 미세 격자 패턴 생성 장치
KR102041905B1 (ko) 스마트기기를 이용한 대상체 표면 촬영이 가능한 휴대형 멀티미디어 정보 획득장치
CN104374545A (zh) 光纤成像式快速光参数测试仪
JP5358743B2 (ja) 表面検査装置
KR100335685B1 (ko) 레이저광을 이용한 관 내부 측정시스템 및 그 측정방법

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 18794346

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 18794346

Country of ref document: EP

Kind code of ref document: A1