WO2001069172A1 - Dispositif de mesure sans contact - Google Patents

Dispositif de mesure sans contact Download PDF

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Publication number
WO2001069172A1
WO2001069172A1 PCT/US2001/007631 US0107631W WO0169172A1 WO 2001069172 A1 WO2001069172 A1 WO 2001069172A1 US 0107631 W US0107631 W US 0107631W WO 0169172 A1 WO0169172 A1 WO 0169172A1
Authority
WO
WIPO (PCT)
Prior art keywords
measurement
measured object
measurement device
image data
contact sensor
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/US2001/007631
Other languages
English (en)
Inventor
Alfred A. Pease
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.)
Perceptron Inc
Original Assignee
Perceptron 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 Perceptron Inc filed Critical Perceptron Inc
Priority to JP2001568011A priority Critical patent/JP2003527590A/ja
Priority to AU2001240138A priority patent/AU2001240138A1/en
Priority to EP01914787A priority patent/EP1261841A4/fr
Publication of WO2001069172A1 publication Critical patent/WO2001069172A1/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
    • G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
    • 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
    • G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
    • G01B11/25—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures by projecting a pattern, e.g. one or more lines, moiré fringes on the object
    • G01B11/2513—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures by projecting a pattern, e.g. one or more lines, moiré fringes on the object with several lines being projected in more than one direction, e.g. grids, patterns
    • 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
    • G01B11/26—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes

Definitions

  • the present invention relates generally to a non-contact measurement device and, more particularly, a hand-held or tool integrated measurement device for quickly and accurately performing non-contact measurements of dimensions and/or angles associated with various objects in a home or commercial work area.
  • Measurement of angles and dimensions of wood products and woodworking equipment has up to now been performed through the use of various mechanical and electronic calipers, squares, protractors, steel rules, tape measurers, levels, and point range measuring devices.
  • These various devices suffer from mechanical inaccuracies and human visual limitations (such as parallax). Furthermore, these devices require sometimes difficult direct or impossible physical contact with the object being measured.
  • a hand-held or tool integrated measurement device for quickly and accurately performing non-contact measurements of dimensions and/or angles associated with various objects in a home or commercial work area.
  • the measurement device generally includes an user input element, a non-contact sensor, an image processor and a display element packaged in a portable housing assembly.
  • a user initiates the measurement by activating the user input element associated with the measurement device.
  • the non- contact sensor receives a trigger signal from the user input element and is operative to collect image data representative of at least a portion of the surface of a measured object.
  • the image processor in turn receives the image data from the non-contact sensor and is operative to convert the image data into measurement data for the measured object.
  • the display element is operable to visually display the measurement data to the user.
  • a hand-held measurement device measures dimensions of various cuts and angles of wood, plastic, ceramic and metal pieces produced in a home or commercial work area.
  • a portable measurement device may be integrated with various power tool equipment, such as table saws, miter saws, radial arm saws, band saws, the drill presses, routers, shapers, planers, joiners and lathe.
  • Figure 1 is a perspective view of a portable non-contact measurement device in accordance with the present invention.
  • Figure 2 is a diagram illustrating laser triangulation technology as employed in an exemplary non-contact sensor
  • Figure 3 is a block diagram depicting the primary components of the non-contact measurement device in accordance with the present invention
  • Figures 4A and 4B are flow charts depicting an exemplary measurement cycle for the non-contact measurement device in accordance with the present invention.
  • FIGS. 5A and 5B illustrate a first preferred application for the non-contact measurement device in accordance with the present invention.
  • Figure 6 illustrates a second preferred application for the non-contact measurement device in accordance with the present invention.
  • FIG. 1 An exemplary portable measurement device 10 in accordance with the present invention is shown in Figure 1.
  • the portable measurement device 10 is housed in a housing assembly 12 which is sized to be hand-held by a user. It should be appreciated that housing assembly 12 may further include other design features (such as a handle or a hand-formed gripping area) that facilitate the portable nature of the measurement device
  • the operation of the measurement device may be controlled via the user interface elements integrated into the housing assembly 12.
  • one or more push buttons 14 are used to receive input from the user and a display 16 is used to visually output measurement data to the user.
  • the portable measurement device 10 is based on well known laser triangulation technology heretofore employed in various commercially available non- contact sensors.
  • a non-contact sensor 100 projects one or more planes of laser light 101 towards an object 102.
  • the laser plane 101 is projected by a light source assembly 107 that preferably includes a laser diode, a laser projection lens assembly and accompanying electronics for controlling the light source assembly.
  • the points of intersection of the projected laser plane and the object 103 are then imaged by a electronic camera assembly 104.
  • the electronic camera assembly 104 preferably comprises an imaging array (e.g, CCD or CMOS), a lens assembly, and accompanying electronics for controlling the electronic camera assembly.
  • the image data for a flat object oriented perpendicular to the laser plane is a nominally straight line as shown in inset 105. Due to the triangular relationship between the light source and the electronic camera assembly, displacement of the object 102 toward or away from the sensor 100 results in the movement of the image data up and down, respectively.
  • the resolution of vertical displacement in the image (V) depends on the thickness of the laser line, the number of pixels in the electronic camera and the overall signal to noise ratio of the imaging system.
  • the triangulation angle (at the center of the field) is typically between 15 degrees and 25 degrees.
  • FIG. 3 illustrates the basic components associated with the portable measurement device 10 of the present invention.
  • the portable measurement device 10 generally includes one or more user input elements 18, a controller 20, a non-contact sensor 22, an image processor 24, a display 26, and a power supply (e.g., a battery). It should be appreciated that one or more subcomponents from an exemplary non-contact sensor (rather than a complete sensor unit) may be incorporated into the portable measurement device 10.
  • One or more user input elements 18 receive input commands from a user of the measurement device. Input commands may include power on/off commands, measurement trigger commands, measurement mode commands, measurement origin offset commands, etc. The input commands are in turn communicated to the controller 20.
  • the user input elements 18 may assume a variety of forms, including push buttons, radial knobs, a touch screen display, or a combination thereof.
  • the controller 20 controls the overall operation of the measurement device 10.
  • the controller 20 interfaces with the non-contact sensor 22 to facilitate acquisition of image data for a measured object.
  • the controller 20 may issue power on/off commands and/or power setting commands to the light source associated with the non-contact sensor 22.
  • the controller 20 may also issue power on/off commands, measurement trigger commands, exposure commands, resolution setting commands, and/or data transfer commands to the imaging array associated with non-contact sensor 22.
  • the controller 20 interfaces with the image processor 24.
  • the image processor 24 is adapted to retrieve image data from the non-contact sensor 22 and to convert the image data into measurement data for the measured object.
  • the image processor 24 includes one or more algorithms for converting the raw image data into measurement data as is well known in the art. It is envisioned that a different algorithm may be used depending on the type of measurement being taken (e.g., width of an object, angle between two adjacent surface, etc.) by the device.
  • a display 26 embedded into the housing of the measurement device is used to visually display the measurement data to the user. To do so, the display is adapted to receive measurement data from the image processor 24. In addition, the display 26 may further receive input commands from the controller as to how the dimensional data is to be displayed to the user.
  • the display 26 may be graphic or numeric and assume a variety of forms, such as an LED or a LCD.
  • the portable measurement device 10 may optionally include an external communication port 28 (e.g., RS-322, USB, wireless port, etc). It is envisioned that the controller 20 may transmit measurement data via the communication port 28 to an external source. In addition, the controller 20 may also receive remote activation commands or updates to the software algorithms via the communication port 28 from an external source.
  • An external communication port 28 e.g., RS-322, USB, wireless port, etc.
  • the controller 20 may transmit measurement data via the communication port 28 to an external source.
  • the controller 20 may also receive remote activation commands or updates to the software algorithms via the communication port 28 from an external source.
  • a typical measurement cycle for the above-described measurement device 10 is depicted in Figure 4. Initially, device preparation steps are performed by the user. In step 400, the user selects the measurement mode for the device. The measurement mode indicates the type of measurement that is to be taken (e.g., width of an object, angle between two adjacent surfaces, etc.) by the device.
  • the measurement mode determines the algorithm used to convert the image data into measurement data as well as dictates the how the measurement data will be displayed to the user.
  • the sensor is powered on by the user in step 402. As a result, the measure laser plane and possibly an auxiliary alignment beam are projected from the measurement device 10.
  • the user directs the measurement device towards the object to be measured in step 404.
  • the measurement device is positioned such that the measured object falls within the field of view of the non-contact sensor.
  • an auxiliary laser light source may be used to assist the user in localizing the measured object within the center of the field of view of the sensor.
  • the user can then trigger a measurement as shown in step 406.
  • a trigger command is generated and sent to the controller.
  • the controller sets the camera exposure to some predefined value and then commands the camera to capture image data at step 408. It is also envisioned that the user may set the camera exposure via the user input elements as part of the above-described device preparation process.
  • the image data may be partially processed to determine correctness of the exposure setting as shown in step 410.
  • the exposure setting is dependent on various factors such as the angle of incidence and the material of the measured object.
  • the adequacy of the exposure is evaluated in step 412. If the exposure setting for the camera is not correct, the controller may estimate the correct setting at step 416 and adjust the exposure setting at step 418 before commanding the camera to take another image. This process may be repeated until an accurate exposure setting cycle is obtained. It is envisioned that no more than two cycles would be needed in a typical application in order to achieve an accurate exposure setting. Moreover, it is expected that the time for this iterative process is much less than a second. In the event that no exposure setting is deemed to be adequate after some predefined number of iterations or some predefined threshold time, then a fault indicator is provided to the user.
  • the image data is fully processed in step 420.
  • the image data is transferred from the sensor to the image processor.
  • the image processor in turn converts the image data to measurement data using the applicable algorithm.
  • the measurement data is visually displayed to the user.
  • a visual indicator of the measurement mode as well as a visual representation of the measured object may also be displayed to the user.
  • the measurement data may also be stored for subsequent processing in a memory space residing on the device. The above-described measurement cycle (or some portion thereof) may be repeated to obtain additional measurement data.
  • the measurement device may be powered down upon completion of the measurement cycle at step 426. After some predefined time period of inactivity, it is envisioned that the sensor will power down to a standby mode. In the standby mode, the display is still readable until the measurement device is completely turned off. It is to be understood that only the relevant steps of the measurement cycle are discussed above, but that other software-implemented instructions may be needed to control and manage the overall operation of the portable measurement device.
  • Figures 5A and 5B illustrate a first preferred application for the portable measurement device 10 of the present invention.
  • the portable measurement device 10 is hand-held to measure various dimensional or angular attributes of a measured object.
  • Measurement data for the object may include (but is not limited to) the angle between any two surfaces, compound angle for any two surfaces, the height of an object, the width of an object, and the diameter of an object.
  • the measurement device 10 is measuring the height of a board.
  • the measurement device 10 may measure the angle between two surface as shown in Figure 5B. It is envisioned that many other types of dimensional or angular measurements (e.g., width and depth of slots or holes in an object) are also within the scope of the present invention.
  • a hand-held measurement device preferably uses at least two projected laser planes to improve the accuracy of measurement data.
  • the second laser plane is used to eliminate error caused by a non-normal incident angle of the projected laser plane with the surface of the measured object. In this way, the measurement device need not be perpendicular to the measure object in order to obtain accurate measurement data.
  • the portable nature of the measurement device 10 allows it to be placed on any flat surface (e.g., on a workbench or on the floor), mounted in a stand, or positioned in other areas of a typical work environment, such that the housing assembly of the device serves as a reference plane for the measurement data.
  • FIGS 6A and 6B illustrates a second preferred application for the portable measurement device 10 of the present invention.
  • the measurement device is integrated with a power tool assembly.
  • a power tool assembly While the following description is provided with reference to a table saw, it is readily understood that the broader aspects of the present invention are applicable to other types of power tool assemblies, such as radial arm saws, band saws, drill presses, router, shapers, planers, joiners, and lathes.
  • the power tool assembly 600 includes a work table 602 adapted to support at least one power tool in a proximate location to the work table, and a support structure 604 for supporting the work table 602 in an elevated position above a substantially planar surface, such as the surface of a workbench or the floor.
  • a saw blade 606 extends through a working surface 608 of the table as shown in Figure 6A.
  • the power tool assembly 600 may further include a movable guide fence 609 as is well known in the art.
  • the portable measurement device 10 is slidably mounted and movable along the surface of the working surface of table as shown in Figure 6A.
  • a slide slot 610 is formed into the working surface of the table to facilitate the movement of the measurement device along the work table 602.
  • a slide member 612 is disposed into one of the grooves 614 which are formed in the housing assembly of the measurement device 10.
  • the slide member 612 of the measurement device in turn slidably engages the slide slot 610 of the working table 602.
  • the measurement device 10 is slidably movable along the length of the work table.
  • other known techniques may be used to mounting the measurement device to the work table. Rather than a detachable accessory, the measurement device may alternatively be part of or incorporated into the structure of the power tool assembly.
  • the measurement device 10 may determine various measurements associated with the power tool support assembly and the operation of an accompanying power tool.
  • types of applicable measurements may include (but is not limited to) the angle of the saw blade relative to the working surface, the height of the saw blade, the saw blade run out, the angle of the guide fence relative to the saw blade or to the working surface, the distance between the guide fence and the saw blade, and the height of a workpiece on the work table.
  • selectable measurement modes may be dependent on the type and configuration of the power tool assembly. Therefore, it is envisioned that other types of measurements are also within the scope of the present invention.
  • the present invention provides a significant advance in the art of portable measurement devices.
  • the invention quickly and accurately performs non-contact measurements of dimensions and/or angles associated with various objects in a home or commercial work area. While the invention has been described in its presently preferred form, it will be understood that the invention is capable of modification without departing from the spirit of the invention as set forth in the appended claims.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)

Abstract

La présente invention concerne un dispositif de mesure (10) manuel ou à outil intégré permettant de mesurer sans contact de manière rapide et précise des dimensions et/ou des angles associés à divers objets dans une maison ou une zone de travail commerciale. Ce dispositif de mesure (10) comprend généralement au moins un élément d'entrée d'utilisateur (18), un capteur sans contact (22), un processeur d'images (24), et un élément d'affichage (26) intégrés dans un boîtier portatif. Pendant la marche, l'utilisateur commence l'opération de mesure en activant l'élément d'entrée d'utilisateur (18) associé au dispositif de mesure (10). Le capteur sans contact (22) reçoit de l'élément d'entrée d'utilisateur (18) un signal de déclenchement et agit de façon à recueillir des données d'images correspondant au moins à une partie de la surface d'un objet mesuré. Le processeur d'images (24) reçoit alors les données d'images du capteur sans contact (22) et les convertit en données de mesure pour l'objet mesuré. L'élément d'affichage (26) affiche alors visuellement les données de mesure pour l'utilisateur.
PCT/US2001/007631 2000-03-10 2001-03-09 Dispositif de mesure sans contact Ceased WO2001069172A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2001568011A JP2003527590A (ja) 2000-03-10 2001-03-09 非接触測定装置
AU2001240138A AU2001240138A1 (en) 2000-03-10 2001-03-09 A non-contact measurement device
EP01914787A EP1261841A4 (fr) 2000-03-10 2001-03-09 Dispositif de mesure sans contact

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US18859200P 2000-03-10 2000-03-10
US60/188,592 2000-03-10

Publications (1)

Publication Number Publication Date
WO2001069172A1 true WO2001069172A1 (fr) 2001-09-20

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Family Applications (1)

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PCT/US2001/007631 Ceased WO2001069172A1 (fr) 2000-03-10 2001-03-09 Dispositif de mesure sans contact

Country Status (4)

Country Link
EP (1) EP1261841A4 (fr)
JP (1) JP2003527590A (fr)
AU (1) AU2001240138A1 (fr)
WO (1) WO2001069172A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005107232A2 (fr) 2004-04-21 2005-11-10 Nextengine, Inc. Dispositif de balayage d'objets tridimensionnels portatif
EP1785693A1 (fr) * 2005-11-15 2007-05-16 General Electric Company Jauge optique pour mesurer un contour d'arête
EP1877726A4 (fr) * 2005-03-11 2008-08-06 Creaform Inc Systeme autoreference et appareil de lecture optique 3d
US7499830B2 (en) 2005-11-15 2009-03-03 General Electric Company Computer-implemented techniques and system for characterizing geometric parameters of an edge break in a machined part
US7564571B2 (en) 2003-10-17 2009-07-21 Inos Automationssoftware Gmbh Method for calibrating a camera-laser-unit in respect to a calibration-object
US8082120B2 (en) 2005-03-11 2011-12-20 Creaform Inc. Hand-held self-referenced apparatus for three-dimensional scanning
US8284240B2 (en) 2008-08-06 2012-10-09 Creaform Inc. System for adaptive three-dimensional scanning of surface characteristics
CN115597457A (zh) * 2022-10-28 2023-01-13 招商局重庆公路工程检测中心有限公司（Cn） 辅助垂直百分表及百分表与被测面垂直的判断方法

Families Citing this family (1)

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Publication number Priority date Publication date Assignee Title
JP6989408B2 (ja) * 2018-02-15 2022-01-05 株式会社東芝 携帯型ケーブル測長・切断器

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US4730190A (en) * 1986-10-29 1988-03-08 Winlam Company Hand-held measuring device
US5207007A (en) * 1991-11-25 1993-05-04 Cucinotta Anthony J Set-up tool
US6137564A (en) * 1998-02-03 2000-10-24 Robert Bosch Gmbh Distance measuring device

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US4758093A (en) * 1986-07-11 1988-07-19 Robotic Vision Systems, Inc. Apparatus and method for 3-D measurement using holographic scanning
GB2292605B (en) * 1994-08-24 1998-04-08 Guy Richard John Fowler Scanning arrangement and method
KR19980029435A (ko) * 1996-10-25 1998-07-25 이해규 비접촉식 센서를 이용한 공작물 치수 측정 장치

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US4730190A (en) * 1986-10-29 1988-03-08 Winlam Company Hand-held measuring device
US5207007A (en) * 1991-11-25 1993-05-04 Cucinotta Anthony J Set-up tool
US6137564A (en) * 1998-02-03 2000-10-24 Robert Bosch Gmbh Distance measuring device

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Title
See also references of EP1261841A4 *

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7564571B2 (en) 2003-10-17 2009-07-21 Inos Automationssoftware Gmbh Method for calibrating a camera-laser-unit in respect to a calibration-object
US9549168B2 (en) 2004-04-21 2017-01-17 Nextpat Limited Hand held portable three dimensional scanner
EP1747663A4 (fr) * 2004-04-21 2012-01-18 Nextengine Inc Dispositif de balayage d'objets tridimensionnels portatif
WO2005107232A2 (fr) 2004-04-21 2005-11-10 Nextengine, Inc. Dispositif de balayage d'objets tridimensionnels portatif
US7912673B2 (en) 2005-03-11 2011-03-22 Creaform Inc. Auto-referenced system and apparatus for three-dimensional scanning
US8032327B2 (en) 2005-03-11 2011-10-04 Creaform Inc. Auto-referenced sensing method for three-dimensional scanning
US8082120B2 (en) 2005-03-11 2011-12-20 Creaform Inc. Hand-held self-referenced apparatus for three-dimensional scanning
EP1877726A4 (fr) * 2005-03-11 2008-08-06 Creaform Inc Systeme autoreference et appareil de lecture optique 3d
US8140295B2 (en) 2005-03-11 2012-03-20 Creaform Inc. Auto-referenced sensing device for three-dimensional scanning
US7499830B2 (en) 2005-11-15 2009-03-03 General Electric Company Computer-implemented techniques and system for characterizing geometric parameters of an edge break in a machined part
US7489408B2 (en) 2005-11-15 2009-02-10 General Electric Company Optical edge break gage
EP1785693A1 (fr) * 2005-11-15 2007-05-16 General Electric Company Jauge optique pour mesurer un contour d'arête
US8284240B2 (en) 2008-08-06 2012-10-09 Creaform Inc. System for adaptive three-dimensional scanning of surface characteristics
CN115597457A (zh) * 2022-10-28 2023-01-13 招商局重庆公路工程检测中心有限公司（Cn） 辅助垂直百分表及百分表与被测面垂直的判断方法

Also Published As

Publication number Publication date
EP1261841A4 (fr) 2003-09-17
JP2003527590A (ja) 2003-09-16
AU2001240138A1 (en) 2001-09-24
EP1261841A1 (fr) 2002-12-04

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