WO1995029391A1 - Sensor arrangement for color identification of object surfaces - Google Patents
Sensor arrangement for color identification of object surfaces Download PDFInfo
- Publication number
- WO1995029391A1 WO1995029391A1 PCT/DE1995/000480 DE9500480W WO9529391A1 WO 1995029391 A1 WO1995029391 A1 WO 1995029391A1 DE 9500480 W DE9500480 W DE 9500480W WO 9529391 A1 WO9529391 A1 WO 9529391A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sensor arrangement
- arrangement according
- radiation
- receiver
- transmitters
- Prior art date
Links
- 238000011156 evaluation Methods 0.000 claims abstract description 23
- 230000005855 radiation Effects 0.000 claims abstract description 22
- 230000003287 optical effect Effects 0.000 claims abstract description 18
- 238000001514 detection method Methods 0.000 claims description 9
- 238000010606 normalization Methods 0.000 claims description 2
- 230000001360 synchronised effect Effects 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 claims 1
- 239000003086 colorant Substances 0.000 claims 1
- 230000001629 suppression Effects 0.000 claims 1
- 230000003595 spectral effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 6
- 230000015654 memory Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000003550 marker Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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
- G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
- G01J3/50—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors
-
- 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
- G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
- G01J3/50—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors
- G01J3/501—Colorimeters using spectrally-selective light sources, e.g. LEDs
-
- 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
- G01J3/02—Details
- G01J3/0256—Compact construction
Definitions
- the invention relates to a sensor arrangement for color detection of object surfaces, with light transmitters for emitting optical radiation in different wavelength ranges and light receivers for receiving the remitted radiation, the transmitters having a control circuit with compensation means and the receivers an evaluation scarf ⁇ device for receive signals is assigned.
- color sensors are required with which the detection of objects with at least partially colored surfaces is possible.
- Such color sensors are known from the prior art, which either illuminate the object with white light and evaluate the remitted light with regard to its color components, or also already irradiate the objects with light of defined, different wavelengths.
- Has light transmitter which in the course of a control cycle successively illuminate the colored surface of the respective object by light pulses of predetermined intensity.
- the light reflected from the colored surface in response to the occurring light pulses is received by an electronic light receiver and converted into an electrical signal, and an evaluation device for a color determination is supplied.
- the light transmitters receive individually defined current pulses in accordance with the ambient temperature and compensation continues for the electrical signals emitted by the light receiver of interference signal components which are caused by the ambient temperature and possibly by incident ambient light.
- DE-A-37 06 056 discloses a method for generating and recognizing optical spectra, in which at least two, preferably three, light transmitters of different wavelengths are used.
- the optical radiation of different wavelengths is simultaneously directed to a point of the object with assigned modulation frequencies and the remitted radiation is detected by a receiver adapted to the emitted radiation and evaluated in a downstream electronic evaluation device.
- the evaluation device works either with a demodulator system in the form of narrow-band filters or with a synchronous demodulation determined by the transmitter.
- the demodulated frequencies are assigned to the known emitted modulations of the radiation wavelength and are digitally evaluated after A / D conversion.
- the level of the converted pulse value is to be displayed as a measure of the strength of the reflected or transmitted radiation or a microprocessor is to be connected for further evaluation.
- the object of the invention is therefore to create a sensor arrangement for color detection of object surfaces that can be used with simple means, but nevertheless guarantees reliable color information.
- the problem is solved by the totality of the features of patent claim 1. Advantageous further developments are specified in the subclaims.
- the simple and reliable evaluation is particularly advantageous in the invention. After the sum of the selectively received color values on the one hand and at least one color value component on the other hand, a color value determination is possible by comparing the current measured values.
- the invention provides a color sensor that can be used in particular as a color marker button. It works without fiber optics and, thanks to its focusing optics, recognizes even the smallest color marks on moving objects at the highest transport speeds. Due to the simple structure compared to the prior art, a robust construction is created, with variable mounting options for the color sensor. At the same time, it is easy to use, since a reference color can be stored by so-called "teach-in" methods. Both color and intensity can be learned, and tolerance settings can also be specified for practical use.
- FIG. 1 shows a sensor unit as a complete module for different mounting options
- FIG. 2 shows the optical sight of the sensor arrangement according to FIG. 1
- FIG. 3 shows the arrangement of the LED sensors for the purpose of being more suitable
- Focusing and Figure 4 shows a suitable operating and evaluation circuit for a sensor unit according to Figure 1.
- 1 denotes an operating housing of a color sensor, which essentially has three partial areas: the front area I is round-cylindrical and contains light transmitters on the one hand with associated means for optical focusing and light receivers on the other hand, which form an optical visor.
- the associated operating and evaluation circuits are accommodated in the central area II of the operating housing 1, which forms a flat cuboid with rounded corners.
- the rear area III contains a coupling point for coupling the operating housing 1 to manipulators or the like and also a sensor interface.
- the operating housing 1 is characterized by a robust construction, so that it can be used for rough, practical operation.
- a plurality of component boards 5 and 6 with the associated circuit arrangements can be arranged one above the other and, if necessary, cast.
- a circuit board can advantageously be arranged continuously on the lower level and likewise already carry the light receivers.
- the light emitting arrangement is designated by 10 in FIG. Upstream of it is a collimator lens 11 and a concave mirror 15 in an asymmetrical arrangement, which has a central opening 16 in front of the lens 11. This ensures that the emitted radiation can reach an object surface without being influenced.
- the reflected radiation is focused by the concave mirror 15 onto a receiver 20.
- a reference receiver 21 is also present.
- a transmitting arrangement 10 with an upstream collimator lens 11 is preceded in particular by a mirror 25 of this type with a central opening 26, the two opposite ones Has parabolic surfaces 27 and 28. Further optical units can be coupled to the optical visor thus formed.
- the light transmitter arrangement 10 consists of a first centrally arranged LED 101, for example for radiation in the red area, and eight LEDs 102 to 109 for radiation, for example in the green area, arranged symmetrically for this purpose.
- a complete chip 100 is thus formed, on which electrical connections 111 ff are provided.
- 101 denotes the LED for the red light wavelength range and 102 one of the LEDs 102 to 108 for the green light wavelength range, 20 the first receiver and 21 the second receiver. So far, the optical elements can already be seen in the previous figures.
- the control circuits 40 and 50 each contain an oscillator 41 and 51 for control a clock generator 42 or 52, each with a different modulation frequency, and subsequent voltage current transformers 43 or 53, to which signal generators 44 or 54 are connected in parallel.
- the receivers 20 and 21 are each followed by amplifiers 61 and 71 and - matched to the modulation devices of the control circuits 40 and 50 - corresponding demodulation devices.
- a high-pass filter 65 and 75 and subsequent parallel bandpass filters 66 and 67 or 76 and 77 with subsequent multiplexers 68 and 78 and further low-pass filters 69, 69 'and 79, 79' are available.
- the first channel with the receiver 20 serves to evaluate the signals, while the second channel works with the receiver 21 as a reference channel. Its signals are fed back to the control circuits 40 and 50 of the LEDs 101 and 102 to 108 in order to compensate for operational properties.
- Switching units are available for this purpose, for example subtractors 63 and 73 for intensity control with setpoint input and downstream control amplifiers 64 and 74.
- the signal for the color value GREEN is sent from the evaluation channel to a first memory 81 and the sum signal for the color value (RED + GREEN) to a second memory 91 via a summer 90.
- the memories 81 and 91 which are designed as digital potentiometers, are each adders and / or subtractors 82 and 92, from which the signals reach window comparators 83 and 93.
- the current analog values in the window comparators 83 and 93 can then be compared with the stored values with a variable tolerance.
- the color type is recognized when the current color value portion is GREEN in the window of the corresponding comparator.
- the normalization to the type of color is realized by the window widths of the window comparator 93 which are proportional to the sum of the color value GREEN and the color value RED.
- the sensitivity of the color detection is changed by setting a proportionality factor for these window widths.
- the intensity of the color is recognized in this evaluation when the current sum of the color value GREEN and the color value RED lies in the window of the corresponding comparator.
- the sensitivity of the intensity detection can be changed by setting constant window widths in the window comparator 93. With this arrangement, the actual color value can be recognized when the color type and intensity have been recorded. The minimum intensity is reached when the tolerance of the color type, which is proportional to the sum of the color value green and color value red, lies above the constant hysteresis of the window comparator 98.
- FIG. 4 A practical evaluation results from FIG. 4, which achieves an application of the color sensor that can also be carried out by the layperson as a user. According to the same principle, a color sensor with three wavelength ranges can be operated if the evaluation circuit is designed accordingly.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP95915137A EP0756698A1 (en) | 1994-04-20 | 1995-04-10 | Sensor arrangement for color identification of object surfaces |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEP4413594.7 | 1994-04-20 | ||
DE4413594A DE4413594A1 (en) | 1994-04-20 | 1994-04-20 | Sensor arrangement for color detection of object surfaces |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1995029391A1 true WO1995029391A1 (en) | 1995-11-02 |
Family
ID=6515878
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1995/000480 WO1995029391A1 (en) | 1994-04-20 | 1995-04-10 | Sensor arrangement for color identification of object surfaces |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0756698A1 (en) |
DE (1) | DE4413594A1 (en) |
WO (1) | WO1995029391A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5963333A (en) * | 1996-09-12 | 1999-10-05 | Color Savvy Systems Limited | Color sensor |
FR2758389A1 (en) * | 1997-01-16 | 1998-07-17 | Raymond Breton | Method for recognising or identifying colours on printed substrate |
DE10106284B4 (en) * | 2001-02-02 | 2018-10-18 | Oligo Lichttechnik Gmbh | Method and device for checking color matching |
DE102009054136A1 (en) | 2009-11-20 | 2011-05-26 | Astech Angewandte Sensortechnik Gmbh | Method for stabilizing drift of color sensor, involves equipping measuring channel with useful multi-band photo receiver, and synchronously enabling electronic signal processing of reference receiver and useful receiver |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3706056A1 (en) * | 1986-06-10 | 1988-05-11 | Baeckmann Reinhard | Process for generating and detecting optical spectra and a switching and sensor system, in particular for sewing and textiles automation |
EP0319769A1 (en) * | 1987-12-03 | 1989-06-14 | Siemens Aktiengesellschaft | Colour-sensing device for identifying objects with a coloured surface |
EP0522548A1 (en) * | 1991-07-10 | 1993-01-13 | Eaton Corporation | Color sensor employing optical fiber bundles with varied diameters |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1011165B (en) * | 1955-12-10 | 1957-06-27 | Leitz Ernst Gmbh | Objective colorimeter |
DE3003607C2 (en) * | 1980-02-01 | 1984-01-05 | Dr.-Ing. Rudolf Hell Gmbh, 2300 Kiel | Circuit arrangement for partial post-correction of color recognition spaces during color recognition |
DE3332750C2 (en) * | 1983-09-10 | 1991-03-28 | Detectron Elektronik GmbH & Co, 7131 Wurmberg | Color mark button |
DE3543416A1 (en) * | 1985-12-09 | 1987-06-11 | Hoechst Ag | METHOD FOR PHOTOMETRICALLY EVALUATING COLOR FIELDS ON TEST STRIPS |
US4760250A (en) * | 1986-09-29 | 1988-07-26 | Spectramed, Inc. | Optoelectronics system for measuring environmental properties having plural feedback detectors |
DE8813466U1 (en) * | 1988-10-27 | 1988-12-15 | Roesler, Klaus-Dieter, Dipl.-Ing., 2803 Weyhe, De | |
DD297241A5 (en) * | 1990-08-14 | 1992-01-02 | Technische Hochschule Leipzig,De | METHOD FOR POINTLY DETERMINING THE SPECTRAL REMISSIONING FUNCTION BY MEANS OF AN OPTOELECTRONIC COLOR MEASURING HEAD |
GB2253481B (en) * | 1991-03-07 | 1994-08-10 | Babcock & Wilcox Co | Fibre optic colour balance monitors |
US5231472A (en) * | 1991-09-16 | 1993-07-27 | Ppg Industries, Inc. | Color matching and characterization of surface coatings |
DE4137128A1 (en) * | 1991-11-12 | 1993-05-13 | Bernstein Senso Plus | Read head for bar codes - has several transmitters of different spectral colours to obtain good reflection of light from bar code contg. lines of several spectral colours |
DE4305006A1 (en) * | 1992-03-23 | 1993-09-30 | Buehler Ag | Automatic handling, sorting and sepn. of waste material - preliminarily sorts by size, density or volume and secondarily identifies by spectrographic analysis, for reclaiming recyclable items |
-
1994
- 1994-04-20 DE DE4413594A patent/DE4413594A1/en not_active Withdrawn
-
1995
- 1995-04-10 WO PCT/DE1995/000480 patent/WO1995029391A1/en not_active Application Discontinuation
- 1995-04-10 EP EP95915137A patent/EP0756698A1/en not_active Ceased
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3706056A1 (en) * | 1986-06-10 | 1988-05-11 | Baeckmann Reinhard | Process for generating and detecting optical spectra and a switching and sensor system, in particular for sewing and textiles automation |
EP0319769A1 (en) * | 1987-12-03 | 1989-06-14 | Siemens Aktiengesellschaft | Colour-sensing device for identifying objects with a coloured surface |
EP0522548A1 (en) * | 1991-07-10 | 1993-01-13 | Eaton Corporation | Color sensor employing optical fiber bundles with varied diameters |
Also Published As
Publication number | Publication date |
---|---|
DE4413594A1 (en) | 1995-10-26 |
EP0756698A1 (en) | 1997-02-05 |
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