EP0892921A1 - Procede et dispositif pour la detection de proprietes d'objets - Google Patents

Procede et dispositif pour la detection de proprietes d'objets

Info

Publication number
EP0892921A1
EP0892921A1 EP97922840A EP97922840A EP0892921A1 EP 0892921 A1 EP0892921 A1 EP 0892921A1 EP 97922840 A EP97922840 A EP 97922840A EP 97922840 A EP97922840 A EP 97922840A EP 0892921 A1 EP0892921 A1 EP 0892921A1
Authority
EP
European Patent Office
Prior art keywords
objects
wavelength
information
detector
different
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.)
Withdrawn
Application number
EP97922840A
Other languages
German (de)
English (en)
Inventor
Thomas Kantimm
Thomas Huth-Fehre
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.)
Institut fuer Chemo und Biosensorik Muenster eV ICB
Original Assignee
Institut fuer Chemo und Biosensorik Muenster eV ICB
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 Institut fuer Chemo und Biosensorik Muenster eV ICB filed Critical Institut fuer Chemo und Biosensorik Muenster eV ICB
Publication of EP0892921A1 publication Critical patent/EP0892921A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/28—Investigating the spectrum
    • G01J3/30—Measuring the intensity of spectral lines directly on the spectrum itself
    • G01J3/36—Investigating two or more bands of a spectrum by separate detectors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
    • B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
    • B07C5/34—Sorting according to other particular properties
    • B07C5/342—Sorting according to other particular properties according to optical properties, e.g. colour
    • B07C5/3422—Sorting according to other particular properties according to optical properties, e.g. colour using video scanning devices, e.g. TV-cameras

Definitions

  • the invention relates to a method and a device for recognizing properties of objects, for example moving objects, according to the preamble of the main claim or the subordinate claim.
  • a sorting device in the prior art, in which objects on a belt are moved past a camera, for example a CCD camera, which records images composed of pixels.
  • a rotating filter wheel is arranged in front of the camera and is designed for different wavelengths. E ⁇ are recorded in succession at different wavelengths while rotating the filter wheel, the images being stored as pixels or image points as three-dimensional data sets in a memory.
  • the wavelengths of the filters of the filter wheel are selected in accordance with the objects to be sorted, so that depending on the wavelength-dependent pixel information stored in the memory, it can be concluded which material it is.
  • This known device is a serial system which leads to measurement errors and artifacts in the case of rapidly moving objects.
  • the invention is therefore based on the object of providing a method and a device for recognizing properties of objects which enable simultaneous image detection at different wavelengths with only one inexpensive detector array.
  • a device for recognizing properties of objects with a inexpensive and fast simultaneous detector are made available. It arises from the virtual splitting of a detector array into different sectors and exposure each sector with the full image, but each with different wavelength-selective filters, a compromise between spectral resolution and spatial resolution, but since many tasks for recognizing properties require only a few wavelengths and a large number of pixels, this compromise is not disadvantageous .
  • a three-dimensional data record with two location information and one spectral information can be obtained from a two-dimensional detector array, in contrast to the prior art mentioned above, all data points are determined simultaneously, i.e. when the object moves, this no longer plays a role or, in other words, the time dimension does not have to be used.
  • the detector array can even be designed as a line camera, that is to say one-dimensionally, the images of the objects to be detected being based on the cellular scanning and the Motion can be saved as pixels of different intensities.
  • the required three-dimensional data set can be generated with an only one-dimensional and therefore inexpensive detector array.
  • the information for the three-dimensional data set can thus be obtained with a two-dimensional detector array, while the two location information can be obtained in the case of objects moving in a uniform or controlled manner. tion of the data sets by the imaging location on a one-dimensional detector array and the time is obtained.
  • the device and the method according to the invention can be used for different recognition tasks, for example for material recognition, whereby sorting tasks, for example sorting cans or bottles of different plastics, sorting rubble or compost sorting can be solved.
  • Another detection task is moisture measurement, for example for dried vegetables for ready meals.
  • different physical states such as ice and water, are determined in particular to determine the state of the road from the air, the device according to the invention being arranged in an aircraft and the movement of the objects due to the relative movement between the aircraft and the earth is caused.
  • FIG. 1 shows a schematic representation of a device for recognizing properties of objects moving on a conveyor belt according to the present invention
  • FIG. 2 shows a schematic perspective view of the filter and imaging optics and of a detector array according to one first exemplary embodiment of the invention
  • Fig. 3 is a sectional view corresponding to the arrangement of FIG. 2, and
  • FIG. 4 shows a sectional view corresponding to FIG. 3 according to a further exemplary embodiment of the invention.
  • Infrared camera for example a CCD camera forming a detector array, wherein the camera 4 images the objects 1 on the tape as a pixel pattern according to their local resolution.
  • a filter and imaging optics arrangement 5 which is shown in more detail in FIGS. 2 and 3, is connected into the beam path between band 2 and camera 4.
  • the filter and imaging optics arrangement 5 consists of several wavelength-selective filters, the spectral transmission curves of which are selected in accordance with the spectral properties of the different materials to be sorted in the rubble.
  • the filter and imaging optics arrangement 5 has imaging optics assigned to the filters, which split the image of the objects 1 on the band 2 in such a way that it is imaged multiple times with different wavelengths on different areas of the detector surface of the camera 4.
  • the wavelength-selective images are stored as image points or pixels in an image memory 6, which is designed, for example, as a computer Evaluation unit 7 is connected.
  • the evaluation unit 7 carries out an evaluation by comparing the image point signals with the corresponding spectral curves of the different materials to be sorted or correlating them, in order to recognize the different materials or material properties.
  • corresponding signals are sent to separating devices via a control input 8, via which the objects 1 are separated according to their material properties.
  • a display 9 can be provided on which the images are displayed.
  • FIGS. 2 and 3 show a filter and imaging optical arrangement 5 for the case of a two-dimensional detector array with an indication of the beam path.
  • four filters 10 with different spectral transmission curves are arranged next to one another in a plane, each of which is followed by lenses 11, which image the object 1 at different locations in the detector field 12 as images 13 at different wavelengths.
  • the detector field is thus virtually split into different sectors or areas and each sector is exposed to the full image at different wavelengths.
  • the detector field 12 serves as a simultaneous detector.
  • the images 13 on the detector field 12 are drawn far apart for the sake of clarity, of course they will be closer together in order to make better use of the detector field 12.
  • FIG. 4 shows a further example of the filter and imaging optics arrangement 5 of FIG. 1.
  • optical wedges 14 are used, which are aligned in accordance with the desired imaging areas. Downstream of the wedges 14 is a converging lens 15 which images 13 on detector field 12.
  • Filters with appropriate imaging optics can be selected depending on the detection tasks and the resolution of the detector arrangement. It is also conceivable for one of the filters to pass a broader wavelength range or the full spectrum, in which case it can be omitted.
  • a detector field is used in FIG. 2, but a detector row can also be provided as a one-dimensional detector arrangement, with a movement of the objects which is constant in the direction and measurable in the amount of the speed then being received as a further dimension.
  • the objects can be moved uniformly, but a different state of motion can also be used as a basis, but this must be measurable or calculable.
  • the same imaging optics shown are to be used in a form reduced to a spatial direction.
  • PVC bottles are used in the beverage industry, whereby these are used by other beverage bottles, which are usually made of polyethylene terephthalate.
  • halat PET
  • Filters 10 with characteristic wavelengths of, for example, 1125 and 1225 nm or 1655 and 1750 nm can be used, the distinction being made according to these wavelengths.
  • moisture measurement which is important, for example, for the drying and freezing of vegetables, the characteristic wavelengths for dry and moist being, for example, 900 and 970 nm or 1050 and 1650 nm or 1280 and 1440 nm.
  • Another area of application is in the detection of the road condition in relation to icing, the images of the road being taken by an aircraft, for example a helicopter.
  • the method according to the invention it is possible to determine the road condition independently of the de-icing salt content.
  • icebergs can be found in the sea.
  • the characteristic wavelengths of water and ice are 1430 and 1480 to 1490 nm.
  • biodegradable organic materials can also be separated from synthetic materials such as waxes and plastics.
  • the characteristic wavelengths would be around 1440 nm for the organic materials and 1200 nm for the synthetic materials.

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • General Physics & Mathematics (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

L'invention concerne un procédé et un dispositif pour la détection de propriétés d'objets (1), selon lequel des images (13) sont enregistrées dans différentes gammes de longueurs d'onde, au moyen d'un ensemble détecteur (4, 12), et les informations de pixels fonction des longueurs d'onde sont stockées dans une mémoire (6). Une unité d'évaluation (7) détermine les propriétés des objets sur la base d'informations de longueurs d'onde prédéterminées et d'informations de longueurs d'onde de pixels. Au moins deux images de l'objet présentant différentes longueurs d'onde sont reproduites simultanément dans une direction de l'espace, sur différentes zones localisées de l'ensemble détecteur, par l'intermédiaire de filtres (10) à sélection de longueurs d'onde et de dispositifs associés de reproduction optique (11, 14, 15).
EP97922840A 1996-04-12 1997-04-11 Procede et dispositif pour la detection de proprietes d'objets Withdrawn EP0892921A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19616176 1996-04-12
DE1996116176 DE19616176A1 (de) 1996-04-12 1996-04-12 Verfahren und Vorrichtung zur Erkennung von Eigenschaften bewegter Objekte
PCT/DE1997/000764 WO1997039336A1 (fr) 1996-04-12 1997-04-11 Procede et dispositif pour la detection de proprietes d'objets

Publications (1)

Publication Number Publication Date
EP0892921A1 true EP0892921A1 (fr) 1999-01-27

Family

ID=7792195

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97922840A Withdrawn EP0892921A1 (fr) 1996-04-12 1997-04-11 Procede et dispositif pour la detection de proprietes d'objets

Country Status (3)

Country Link
EP (1) EP0892921A1 (fr)
DE (1) DE19616176A1 (fr)
WO (1) WO1997039336A1 (fr)

Families Citing this family (10)

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Publication number Priority date Publication date Assignee Title
DE19728966C2 (de) * 1997-03-25 1999-03-18 Optomed Optomedical Systems Gmbh Bildgebendes Spektrometer
ATE249033T1 (de) * 1997-07-01 2003-09-15 Optomed Optomedical Systems Gmbh Bildgebendes spektrometer
DE19742093A1 (de) 1997-09-24 1999-03-25 Kostal Leopold Gmbh & Co Kg Photoelektrisches Sensorarray
DE19855503B4 (de) * 1998-12-01 2006-12-28 BSH Bosch und Siemens Hausgeräte GmbH Wäschebehandlungsmaschine
DE10156157A1 (de) * 2001-11-15 2003-05-28 Bsh Bosch Siemens Hausgeraete Verfahren und Vorrichtung zur Identifizierung eines Gegenstandes
DE20315118U1 (de) * 2002-10-02 2004-02-05 Veselic, Marija Erfassungssystem und Erfassungsvorrichtung
DE10314424A1 (de) * 2003-03-28 2004-10-07 Cammann, Karl, Prof. Dr. Warnsystem zum Zwecke einer ortsaufgelösten Feststellung von vereisten Oberflächenstellen
US20050263682A1 (en) * 2004-05-28 2005-12-01 Eikenberry Stephen S Dual prism/filter for narrowband photometry
FR2938650B1 (fr) * 2008-11-14 2014-10-10 Suez Environnement Procede et dispositif pour evaluer le taux de matiere organique dans des dechets
CN114164790B (zh) * 2021-12-27 2022-05-10 哈尔滨职业技术学院 一种智能化路面清压实冰雪设备及其使用方法

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US3747755A (en) * 1971-12-27 1973-07-24 Massachusetts Inst Technology Apparatus for determining diffuse and specular reflections of infrared radiation from a sample to classify that sample
DE2327355A1 (de) * 1973-05-29 1975-01-02 Deutsche Forsch Luft Raumfahrt Verfahren zur fernerkundung insbesondere der erdoberflaeche sowie geraet zur durchfuehrung des verfahrens
US4043668A (en) * 1975-03-24 1977-08-23 California Institute Of Technology Portable reflectance spectrometer
FI860648A7 (fi) * 1986-02-12 1987-08-13 O.Kytoelae Ja Kumpp. Ky. Foerfarande och anordning foer bestaemning av vattenhalten hos oljebaserade och liknande vaetskor.
US5024530A (en) * 1989-12-26 1991-06-18 Lockheed Missiles & Space Company, Inc. Multichannel telecentric filtered imager
DE4008280A1 (de) * 1990-03-15 1991-09-19 Tzn Forschung & Entwicklung Verfahren zur ermittlung des fahrbahnoberflaechenzustandes
DE4115784A1 (de) * 1990-06-09 1991-12-12 Deutsche Plakat Werbung Drehbarer beleuchteter werbetraeger fuer wechselnde motive
US5120126A (en) * 1991-06-14 1992-06-09 Ball Corporation System for non-contact colored label identification and inspection and method therefor
IL101612A0 (en) * 1992-04-16 1992-12-30 Electro Optics Ind Ltd Apparatus and method for inspecting articles such as agricultural produce
DE4309939C2 (de) * 1993-03-26 1996-10-02 Guenter Dr Ing Dau Verfahren und Vorrichtung zur vollautomatischen Analyse der Mischgüte von Feststoffmischern

Non-Patent Citations (1)

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Title
See references of WO9739336A1 *

Also Published As

Publication number Publication date
DE19616176A1 (de) 1997-10-16
WO1997039336A1 (fr) 1997-10-23

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