WO2018110267A1 - Dispositif de mesure de caractéristiques de réflexion/transmission - Google Patents

Dispositif de mesure de caractéristiques de réflexion/transmission Download PDF

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Publication number
WO2018110267A1
WO2018110267A1 PCT/JP2017/042520 JP2017042520W WO2018110267A1 WO 2018110267 A1 WO2018110267 A1 WO 2018110267A1 JP 2017042520 W JP2017042520 W JP 2017042520W WO 2018110267 A1 WO2018110267 A1 WO 2018110267A1
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WO
WIPO (PCT)
Prior art keywords
light emission
light
emission time
temperature
measurement
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Application number
PCT/JP2017/042520
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English (en)
Japanese (ja)
Inventor
澤村　茂樹
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コニカミノルタ株式会社
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Publication date
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Priority to JP2018556540A priority Critical patent/JP7052729B2/ja
Publication of WO2018110267A1 publication Critical patent/WO2018110267A1/fr

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    • 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
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
    • G01J1/44—Electric circuits
    • G01J1/46—Electric circuits using a capacitor
    • 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
    • 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
    • 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
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/27—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using photo-electric detection ; circuits for computing concentration

Definitions

  • the present invention relates to a reflection / transmission characteristic measuring apparatus.
  • a spectrocolorimeter is a device that measures the spectral reflection characteristics of a sample.
  • the spectrocolorimeter irradiates the sample with illumination light and measures the spectral characteristics and the like of the reflected light generated by the sample reflecting the illumination light.
  • a light-emitting circuit supplies power necessary for a light-emitting operation to a light source, the light source performs a light-emitting operation that emits illumination light, and a photodetector outputs a detection signal corresponding to reflected light.
  • the integration circuit integrates the detection signal and outputs an integration signal, and the arithmetic processing unit calculates the result of spectral colorimetry from the output integration signal.
  • the characteristics of the elements provided in the light source provided in the spectrocolorimeter and the light emitting circuit provided in the spectrophotometer depend on the environment and change with time. For this reason, the measurement performance of the spectrocolorimeter also depends on the environment and changes with time. For example, when the environmental temperature changes, the power supplied by the light emitting circuit changes, the amount of illumination light emitted from the light source changes, the amount of reflected light received by the photodetector changes, and the spectrocolorimeter The measurement performance changes. Further, as time passes, the light source deteriorates, the amount of light emitted from the light source decreases, the amount of reflected light received by the photodetector decreases, and the measurement performance of the spectrocolorimeter changes.
  • a reflection characteristic measurement device such as a spectrocolorimeter
  • calibration may be performed so that measurement can be performed accurately even when the amount of light emitted from the light source changes.
  • the techniques described in Patent Documents 1 and 2 are an example.
  • the brightness of a light source is measured by a brightness detection sensor, and when it is determined that the brightness of the light source is not normal, the brightness of the light source is adjusted to a normal brightness. (Paragraphs 0027 and 0028). According to the technique described in Patent Document 1, the brightness of the light source is maintained at a normal value, and the measurement reliability is improved (paragraphs 0030 and 0034).
  • the intensity of the illumination light is changed. Therefore, the spectral intensity of the illumination light changes with the change of the intensity of the illumination light, and is measured. An error may occur in the reflection characteristics.
  • the spectral intensity of the projected light changes as the brightness of the light source is adjusted. There may be an error in accuracy.
  • a correction error may occur in the reflection characteristic because the spectral reflection characteristic is corrected.
  • a correction error may occur in the color measurement value.
  • the invention described in the detailed description of the invention aims to solve these problems.
  • the problems to be solved by the invention described in the detailed description of the invention are to suppress the occurrence of errors in reflection characteristics / transmission characteristics, to suppress the complexity of the structure of the reflection / transmission characteristics measurement apparatus, and to reflect / To prevent the control from becoming complicated in the transmission characteristic measuring apparatus.
  • the reflection / transmission characteristic measurement device includes a light source, a light emitting circuit, a photodetector, an integrator, a storage unit, a control unit, and an arithmetic processing unit.
  • the light source emits illumination light applied to the sample.
  • the light emitting circuit supplies the light source with the power required to emit the illumination light.
  • the light detector outputs a detection signal corresponding to reflected light or transmitted light.
  • the reflected light is generated when the sample reflects the illumination light.
  • the transmitted light is generated when the sample transmits the illumination light.
  • Integrator integrates the detection signal and outputs the integration signal.
  • the storage unit stores at least one light emission time.
  • the integrated signal is the first integrated signal when white calibration is performed and the integrated signal is the second integrated signal when measurement is performed
  • white the light source circuit is controlled so that the light source emits illumination light for a first light emission time included in at least one light emission time. As the first integrated signal becomes smaller, at least one after correction is performed. A correction process for increasing the light emission time is performed on at least one light emission time.
  • the light source emits illumination light for a second light emission time included in at least one light emission time. The light emitting circuit is controlled.
  • the calculation processing unit calculates the reflection / transmission characteristics of the sample from the second integration signal.
  • 1 is a block diagram illustrating a spectrocolorimeter according to a first embodiment. It is a figure which shows the table memorize
  • FIG. 1 is a block diagram illustrating a spectral colorimeter according to a first embodiment.
  • the spectrocolorimeter 1000 illustrated in FIG. 1 irradiates the sample 1020 with the illumination light 1040, receives the reflected light 1041 generated when the sample 1020 reflects the illumination light 1040, and obtains the spectral intensity of the reflected light 1041.
  • the colorimetric value of the sample 1020 is obtained from the spectral intensity. Reflective characteristics other than the colorimetric values may be obtained instead of or in addition to the colorimetric values. For example, spectral reflectance may be obtained. Instead of the reflected light 1041, transmitted light generated when the sample 1020 transmits the illumination light 1040 may be received.
  • the spectrocolorimeter 1000 When transmitted light is received instead of the reflected light 1041, the spectrocolorimeter 1000, which is a reflection characteristic measurement device that obtains reflection characteristics, becomes a transmission characteristic measurement device that obtains transmission characteristics.
  • the spectrocolorimeter 1000 that is a spectrocolorimetric reflection characteristic measurement apparatus may be replaced with a colorimeter that is a stimulus value direct reading reflection characteristic measurement apparatus.
  • the spectrocolorimeter 1000 includes a light source 1060, a light emitting circuit 1061, a photodetector 1062, an integrator 1063, an A / D converter 1064, a control calculation unit 1065, a storage unit 1066, a temperature detector 1067, and a display unit 1068.
  • the photodetector 1062 includes a light receiving element 1080.
  • the integrator 1063 includes an integration circuit 1100.
  • the control calculation unit 1065 includes a control unit 1120 and a calculation unit 1121.
  • the spectrocolorimeter 1000 may include components other than these components.
  • the light source 1060 is a xenon flash lamp, a light emitting diode (LED) or the like, and emits illumination light 1040.
  • the light emitting circuit 1061 supplies the light source 1060 with power required to emit the illumination light 1040.
  • the photodetector 1062 outputs a detection signal 1140 corresponding to the reflected light 1041.
  • the light receiving element 1080 is also called a photosensor, receives the reflected light 1041, and outputs a current corresponding to the reflected light 1041.
  • the detection signal 1140 is a current output from the light receiving element 1080.
  • the photodetector 1062 When transmitted light is received instead of the reflected light 1041, the photodetector 1062 outputs a detection signal corresponding to the transmitted light.
  • the integration circuit 1100 integrates the detection signal 1140 and outputs an integration signal 1160.
  • the integration signal 1160 is obtained by converting the current output from the light receiving element 1080 into a voltage.
  • the A / D converter 1064 converts the integrated signal 1160 that is an analog electric signal into an integrated signal 1180 that is a digital electric signal.
  • the control calculation unit 1065 is an embedded computer and operates according to the installed firmware. A part of the function of the control arithmetic unit 1065 may be carried by hardware that does not execute software.
  • the control unit 1120 controls the light emitting circuit 1061.
  • the calculation unit 1121 calculates the colorimetric value of the sample 1020 from the integrated signal 1180. Therefore, the A / D converter 1064 and the calculation unit 1121 constitute a calculation processing unit 1190 that calculates the colorimetric value of the sample 1020 from the integrated signal 1160.
  • the storage unit 1066 stores the information output from the control calculation unit 1065, and stores a table, a measurement count, and a correction count described later.
  • the number of times of measurement is the number of times a measurement described later has been performed.
  • the number of corrections is the number of times correction processing described later has been performed.
  • the temperature detector 1067 detects the temperature of the light emitting circuit 1061.
  • the temperature inside the spectrocolorimeter 1000 other than the temperature of the light emitting circuit 1061 may be detected.
  • Display unit 1068 displays information output from control calculation unit 1065.
  • FIG. 2 is a diagram showing a table stored in the spectrocolorimeter of the first embodiment.
  • a table 1200 illustrated in FIG. 2 is a relationship table that is stored in the storage unit 1066 and defines the relationship between the temperature of the light emitting circuit 1061 and the light emission time of the light source 1060.
  • the five light emission times “85 ⁇ sec” and “ Including 80 ⁇ sec, “75 ⁇ sec”, “65 ⁇ sec” and “60 ⁇ sec”, five temperatures are “10 ° C. or lower”, “10-15 ° C.”, “15-20 ° C.”, “20-35 ° C.” and “35 ° C. or higher”. including. “10 ° C. or less”, “10-15 ° C.”, “15-20 ° C.”, “20-35 ° C.” and “35 ° C.
  • the table 1200 may be replaced with a table including 4 or less or 6 or more temperatures corresponding to 4 or less or 6 or more emission times each including 4 or less or 6 or more emission times.
  • the table 1200 is defined such that the light emission time increases as the temperature decreases.
  • one light emission time corresponding to an arbitrary temperature may be stored in the storage unit 1066.
  • FIG. 3 is a graph illustrating changes in the emitted light amount of a light source depending on the temperature of the light emitting circuit when the light source is a xenon tube.
  • the amount of light emitted from the light source 1060 decreases as the temperature of the light emitting circuit 1061 decreases.
  • the amount of light emitted from the light source 1060 decreases as the temperature of the light emitting circuit 1061 decreases.
  • the loss inside the capacitor increases because the tan ⁇ of the capacitor increases as the temperature of the capacitor provided in the light emitting circuit 1061 decreases. Because.
  • the change in the amount of emitted light when the temperature changes by 5 ° C. may be 10% or more of the amount of emitted light at 25 ° C., and becomes particularly large on the low temperature side.
  • a correction process in which the light emission time of the light source 1060 becomes longer as the temperature of the light emission circuit 1061 becomes lower If performed, the decrease in the amount of light emitted from the light source 1060 is compensated by the extension of the light emission time of the light source 1060, the intensity of the integrated signal 1160 is maintained, and the performance of the spectrocolorimeter 1000 such as a decrease in the S / N ratio is improved. Reduction is suppressed.
  • FIG. 4 is a flowchart illustrating the white calibration procedure performed in the spectrocolorimeter of the first embodiment.
  • the integration signal 1160 is the first integration signal
  • the temperature detected by the temperature detector 1067 is the first temperature
  • step S101 white calibration is started.
  • step S102 following step S101 the temperature detector 1067 detects the temperature.
  • step S103 following step S102 the control unit 1120 sets a first light emission time.
  • the table 1200 is referred to, and the five temperatures are “10 ° C. or lower”, “10-15 ° C.”, “15-20 ° C.”, “20-35 ° C.”, and “35 ° C. or higher”.
  • the first coincidence temperature which is the temperature that coincides with the first temperature, is selected, and the first coincidence temperature is selected from the five light emission times “85 ⁇ sec”, “80 ⁇ sec”, “75 ⁇ sec”, “65 ⁇ sec”, and “60 ⁇ sec”.
  • the first corresponding light emission time which is the light emission time corresponding to is selected, and the first corresponding light emission time is set as the first light emission time.
  • the one light emission time is set as the first light emission time.
  • step S104 the spectrocolorimeter 1000 performs a measurement operation.
  • the sample 1020 becomes a white calibration plate
  • the control unit 1120 controls the light emitting circuit 1061 so that the light source 1060 emits the illumination light 1040 for the first light emission time. Since the table 1200 is defined such that the light emission time becomes longer as the temperature becomes lower, the first light emission time becomes longer as the first temperature becomes lower.
  • step S105 the control unit 1120 determines whether or not the first integration signal is within the allowable range. When it is determined in step S105 that the first integrated signal is within the allowable range, the control unit 1120 executes step S106 following step S105. When determining in step S105 that the first integrated signal is not within the allowable range, the control unit 1120 executes steps S107 to S113 subsequent to step S105.
  • step S106 white calibration is completed.
  • step S107 the control unit 1120 determines whether or not the number of measurements is less than N, which is the standard number of measurements. When it is determined that the number of times of measurement is less than N times, the control unit 1120 executes steps S108 to S110 subsequent to step S107. When it is determined that the number of measurements is N or more, the control unit 1120 executes step S111 to step S113 following step S107.
  • step S107 when it is estimated that there is an individual difference of the light source 1060, the first correction process suitable for the case where there is an individual difference of the light source 1060 in steps S108 to S110 is performed.
  • the second correction process suitable for the case where the degradation of the light source 1060 exists in steps S111 to S113 is performed. The first correction process and the second correction process are different from each other.
  • step S108 the control unit 1120 determines whether the first integral signal is smaller than the lower limit of the allowable range or larger than the upper limit of the allowable range.
  • step S109 the control unit 1120 executes step S109 following step S108.
  • step S110 the control unit 1120 executes step S110 following step S108.
  • step S109 the control unit 1120 corrects the table 1200.
  • the five light emission times included in the table 1200 are corrected so that the five light emission times after correction are longer than the five light emission times before correction.
  • the five light emission times are uniformly extended by 5 ⁇ sec.
  • the correction amounts of the five light emission times may be different from each other.
  • step S110 the control unit 1120 corrects the table 1200.
  • the five light emission times included in the table 1200 are corrected so that the five light emission times after correction are shorter than the five light emission times before correction.
  • the correction processing is performed on the five light emission times such that the corrected five light emission times become longer as the first integrated signal becomes smaller.
  • step S102 is executed again. Moreover, after step S110 is performed, step S102 is performed again. Thus, the first correction process is repeated until the first integrated signal is within the allowable range.
  • step S111 the control unit 1120 determines whether or not the table 1200 has been corrected. If it is determined in step S111 that the table 1200 has not been corrected, the control unit 1120 executes step S112 following step S111. When it is determined in step S111 that the table 1200 has been corrected, the control unit 1120 executes step S113 following step S111.
  • step S112 the control unit 1120 corrects the table 1200.
  • the five light emission times included in the table 1200 are corrected so that the five light emission times after correction are longer than the five light emission times before correction.
  • the table 1200 is corrected.
  • step S113 the control unit 1120 causes the display unit 1068 to display an error.
  • the error display is a warning display indicating that the light source 1060 has deteriorated.
  • an error display is performed.
  • the error display is estimated that the light source 1060 is deteriorated. To be done. The standard number of times of one time may be replaced with the number of times of another standard.
  • step S102 is executed again.
  • FIG. 5 is a flowchart illustrating a measurement procedure performed in the spectrocolorimeter of the first embodiment.
  • the integral signal 1160 is the second integral signal
  • the temperature detected by the temperature detector 1067 is the second temperature
  • step S121 color measurement is started.
  • step S122 following step S121 the temperature detector 1067 detects the temperature.
  • step S123 following step S122 the control unit 1120 sets the second light emission time.
  • the table 1200 is referred to, and the five temperatures are “10 ° C. or lower”, “10-15 ° C.”, “15-20 ° C.”, “20-35 ° C.”, and “35 ° C. or higher”.
  • the second coincidence temperature which is the temperature that coincides with the second temperature, is selected from “85 ⁇ sec”, “80 ⁇ sec”, “75 ⁇ sec”, “65 ⁇ sec”, and “60 ⁇ sec”, which are the five light emission times.
  • the second corresponding light emission time which is the light emission time corresponding to is selected, and the second corresponding light emission time is set as the second light emission time.
  • step S124 the spectrocolorimeter 1000 performs a colorimetric operation.
  • the control unit 1120 controls the light emitting circuit 1061 so that the light source 1060 emits the illumination light 1040 for the second light emission time. Since the table 1200 is defined such that the light emission time becomes longer as the temperature becomes lower, the second light emission time becomes longer as the second temperature becomes lower.
  • step S125 the control unit 1120 determines whether or not the second integration signal is saturated. When it is determined in step S125 that the second integrated signal is not saturated, the control unit 1120 executes step S126. When it is determined in step S126 that the second integrated signal is saturated, control unit 1120 executes step S127.
  • step S126 the arithmetic processing unit 1190 calculates a colorimetric value from the second integration signal, and the colorimetry is completed.
  • step S127 the control unit 1120 causes the display unit 1068 to display an error.
  • the error display is a warning display prompting calibration.
  • the spectrocolorimeter 1000 of the first embodiment since the intensity of the illumination light 1040 is not changed and the colorimetric value of the light source 1060 is not corrected, the occurrence of an error in the colorimetric value is suppressed, In the spectrocolorimeter 1000, the control is prevented from becoming complicated. Further, since a mechanism for monitoring the intensity of the illumination light 1040 is not required, the structure of the spectrocolorimeter 1000 is suppressed from becoming complicated.
  • the reflection / transmission characteristic measuring apparatus may be used in the measurement field for measuring reflection / transmission characteristics.

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Abstract

Afin de supprimer des erreurs dans la mesure de caractéristiques de réflexion/transmission, de réduire la complexité de la structure d'un dispositif de mesure de caractéristiques de réflexion/transmission et de réduire la complexité de commande du dispositif de mesure de caractéristiques de réflexion/transmission, dans le dispositif de mesure de caractéristiques de réflexion/transmission de l'invention, un signal de détection correspondant à la lumière réfléchie ou à la lumière transmise est intégré, et le signal intégré est produit ; si le signal intégré est un premier signal intégré pendant la mise en oeuvre d'un étalonnage du blanc, et que le signal intégré est un second signal intégré pendant la mise en oeuvre d'une mesure, alors, (1) pendant la mise en oeuvre de l'étalonnage du blanc, une lumière d'éclairage est émise uniquement pendant un premier temps d'émission de lumière choisi parmi au moins un temps d'émission de lumière, et le(s) temps d'émission de lumière est/sont soumis à un traitement de correction de sorte que plus le premier signal intégré est faible, plus la post-correction d'au moins un temps d'émission de lumière est longue ; et (2) pendant la mise en oeuvre d'une mesure, la lumière d'éclairage est émise uniquement pendant un deuxième temps d'émission de lumière choisi parmi le(s) temps d'émission de lumière.
PCT/JP2017/042520 2016-12-12 2017-11-28 Dispositif de mesure de caractéristiques de réflexion/transmission WO2018110267A1 (fr)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030048449A1 (en) * 2001-05-16 2003-03-13 Vander Jagt Peter G. Color measurement instrument with modulated illumination
JP2007057529A (ja) * 2005-08-24 2007-03-08 Xerox Corp 分光測光計のターゲット距離変動補償
JP2008232920A (ja) * 2007-03-22 2008-10-02 Anritsu Corp ガス検知装置及び該装置を用いた校正方法並びに波長確認方法
JP2010127661A (ja) * 2008-11-25 2010-06-10 Horiba Ltd 光沢計
JP2011242392A (ja) * 2010-05-17 2011-12-01 Luminex Corp １以上の材料の測定を行うためのシステム及び方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030048449A1 (en) * 2001-05-16 2003-03-13 Vander Jagt Peter G. Color measurement instrument with modulated illumination
JP2007057529A (ja) * 2005-08-24 2007-03-08 Xerox Corp 分光測光計のターゲット距離変動補償
JP2008232920A (ja) * 2007-03-22 2008-10-02 Anritsu Corp ガス検知装置及び該装置を用いた校正方法並びに波長確認方法
JP2010127661A (ja) * 2008-11-25 2010-06-10 Horiba Ltd 光沢計
JP2011242392A (ja) * 2010-05-17 2011-12-01 Luminex Corp １以上の材料の測定を行うためのシステム及び方法

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