CN103411678B - A kind of colourity of light path automatic calibration takes into account colour measurement method - Google Patents
A kind of colourity of light path automatic calibration takes into account colour measurement method Download PDFInfo
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Abstract
The invention discloses a kind of colorimeter of light path automatic calibration, comprise illuminating source, cuvette, correlation optical receiver and data processor, the light signal that described illuminating source sends is input to the receiving end of described correlation optical receiver by described cuvette, the output terminal of described correlation optical receiver and the input end of described data processor communicate to connect, also comprise the compensating light receiver directly receiving the light signal that illuminating source sends, described compensating light receiver comprises vertical type silicon photocell and two-stage amplifier, described vertical type silicon photocell and described two-stage amplifier are connected with data processor after connecting.The invention also discloses a kind of colour measurement method of light path automatic calibration.The present invention improves precision and the accuracy of measurement, overcomes utilizing emitted light decay, realizes the automatic calibration to illuminating source.
Description
Technical field
The present invention relates to a kind of colorimeter, in particular, relate to a kind of colorimeter of light path automatic calibration.
Background technology
Beer-Lambert law is the quantitative basis of absorption photometry, colorimetric analysis and photoelectric colorimetry, and law shows that the absorbed amount of light is proportional in light path the molecule amount producing light absorption.Its specific descriptions are as follows: suppose that a beam intensity is that collimated monochromatic ligth (incident light) vertical irradiation of I0 is in one piece of isotropic uniform pickup dielectric surface, after the absorption layer (light path) by thickness being l, because particle in absorption layer is to the absorption of light, the intensity of this bundle incident light is reduced to It, is called transmitted intensity.Material is directly proportional to the size of the capacity of water of light absorption to all extinction particle sectional areas.Suppose that intensity is that the incident illumination of I is mapped to after on thin-layered medium, light intensity reduces dI, dI is light measuring by degree of absorption in thin-layered medium, be directly proportional to the total sectional area dS of extinction particle in thin layer and the intensity of incident light, through calculating the absorbance A=K*c*l that can obtain thin-layered medium, wherein, K is scale-up factor, can be absorption coefficient or molar absorption coefficient, relevant with the character of absorbing material and the wavelength X of incident light, have nothing to do with the intensity of incident light; L is the thickness of absorbing medium; C is the concentration of extinction material.Beer law shows when the extinction material of a branch of collimated monochromatic ligth perpendicular through a certain even non-scatter, and concentration c and the absorber thickness l of its absorbance A and extinction material are directly proportional.When the thickness l of absorption layer is definite value, the change of absorbance A is only directly proportional to the concentration c of extinction material, Beer law is the philosophy of light absorption, is applicable to all electromagnetic radiation and all extinction materials, comprises gas, solid, liquid, molecule, atom and ion.
From Bill's Lambert law, we will measure absorbance A or the transmittance T of extinction material, Two Variables must be known, i.e. incident intensity I0 and transmitted intensity It, the absorbance A of current measurement extinction material or the colorimeter of transmittance T are all by transmitting illuminant, cuvette and correlation optical receiver are taproot composition, when cuvette is empty, correlation optical receiver place obtains light intensity value and is equivalent to incident intensity angle value I0, after loading solution in cuvette, the value that correlation optical receiver is measured is the value It of transmitted light, thus, absorbance A or the transmittance T that will measure extinction material can be obtained according to Beer-Lambert law.But, current colorimeter is unidirectional test, light source adopts the light emitting diode of small size, light efficiency and the heating of light emitting diode are negative characteristic relation, owing to there is no self-correcting control circuit for light source and compensating light receiver, and only have correlation optical receiver, therefore can only according to the temperature light decay characteristic of luminotron, estimate colorimetric properties, cause colourity to test inaccurate, lack adaptation function, when often the illumination tolerance of luminotron changes a lot, correlation light still calculates colorimetric properties according to invariant, causes very large mistake to test result.
Summary of the invention
Technical matters to be solved by this invention is, overcomes the shortcoming of prior art, provides a kind of colorimeter overcoming utilizing emitted light decay, improve the light path automatic calibration testing colourity accuracy.
Meanwhile, present invention also offers a kind of colour measurement method of the light path automatic calibration solved the problem.
In order to solve above technical matters, the invention provides a kind of colorimeter of light path automatic calibration, comprise illuminating source, cuvette, correlation optical receiver and data processor, the light signal that described illuminating source sends is input to the receiving end of described correlation optical receiver by described cuvette, the output terminal of described correlation optical receiver and the input end of described data processor communicate to connect, also comprise the light source self-correction control module be connected with data processor and the compensating light receiver directly receiving the light signal that illuminating source sends, described light source self-correction control module comprises the STM32F103RB chip and at least one road current-limiting circuit that produce pulse width modulating signal, described current-limiting circuit comprises current-limiting resistance and switching tube, the PWM pin of described STM32F103RB sheet is connected with described switching tube, described switching tube is connected with described illuminating source, described illuminating source and described current-limiting resistance are connected with power supply after connecting, described compensating light receiver comprises vertical type silicon photocell and two-stage amplifier, described vertical type silicon photocell and described two-stage amplifier are connected with data processor after connecting.
Being further defined to of the technical program, described illuminating source comprises 4 light emitting diodes, described light source self-correction control module comprises the 4 tunnel current-limiting circuits be connected with 4 PWM pins of STM32F103RB chip respectively, switching tube in each road current-limiting circuit is connected with one of them light emitting diode, be connected with power supply after the circuit connected in series of above-mentioned light emitting diode therewith in the current-limiting circuit of road, the illumination brightness of STM32F103RB chip controls 4 light emitting diodes, and switch controlled 4 light emitting diodes passing through 4 tunnel current-limiting circuits.
Further, described cuvette is two-way light type quartz colorimetric utensil or four-way light type quartz colorimetric utensil.
Further, described correlation optical receiver is BPW69A type silicon photocell.
Further, between described correlation optical receiver and described data processor, operational amplifier is set.
Further, between described correlation optical receiver and described data processor, AD collector is set.
Another technical scheme provided by the invention is: a kind of colour measurement method of light path automatic calibration, and the solution comprised in contrast colors ware carries out step and the automatic calibration step of colorimetric analysis, specifically carries out as follows:
Inject distilled water in F1, cuvette, open illuminating source and correlation optical receiver, the light intensity that now correlation optical receiver receives is incident intensity, and incident intensity is transferred to data processor by correlation optical receiver;
While collection incident intensity, automatic calibration is carried out to the intensity of light path, method is: data processor judges the incident intensity in step F 1, if incident intensity is less than preset value, then control the STM32F103RB chip of light source self-correction control module, the center carrier frequencies signal of 10KHZ is exported by PWM pin, voltage is added on light emitting diode by current-limiting resistance by current-limiting circuit, the carrier frequency signaling that STM32F103RB chip exports improves the voltage of light emitting diode both sides with millesimal stepping, until the incident intensity that data processor receives equals preset value,
In addition, compensating light receiver receives light source initial strength, and initial strength is sent to data processor, and light source initial strength is associated with incident intensity relation storing by data processor;
Inject testing liquid in F2, cuvette, open illuminating source and correlation optical receiver, the light intensity that now correlation optical receiver receives is transmitted intensity, and transmitted intensity is transferred to data processor by correlation optical receiver;
Compensating light receiver receives light source Real-time intensity, and light source Real-time intensity is sent to data processor, the light source initial strength of the light source Real-time intensity received and storage contrasts by data processor, if light source Real-time intensity is lower than light source initial strength, then perform automatic calibration step, be specially: the STM32F103RB chip controlling light source self-correction control module, the center carrier frequencies signal of 10KHZ is exported by PWM pin, voltage is added on light emitting diode by current-limiting resistance by current-limiting circuit, the carrier frequency signaling that STM32F103RB chip exports improves the voltage of light emitting diode both sides with millesimal stepping, until the light source Real-time intensity that data processor receives equals light source initial strength.
The proportionate relationship of incident intensity and transmitted intensity set up by F3, data processor, processes light signal according to Bill's Lambert law, extrapolates the chromatic value of solution in cuvette.
Further, after step F 3 is complete, the STM32F103RB chip of data processor controlled light source self-correction control module, opening and closing by PWM pin gauge tap pipe, the illuminating source changing another kind of wavelength carries out luminescence, repeated execution of steps F1, F2, F3, carry out new colour measurement.
The invention has the beneficial effects as follows: the colorimeter and the colour measurement method thereof that the invention provides a kind of light path automatic calibration, with compensating light receiver, when utilizing emitted light has subtle change, compensating light receiver just can trace into, thus variable quantity is delivered to data processor as important parameter, enable data processor obtain radiative variable quantity accurately, contrast with the quantities received of correlation light, perfectly calculate the chromatic value of solution in cuvette, improve the precision and accuracy measured; Simultaneously, colorimeter of the present invention is with light source self-correction control module, according to the Strength Changes of the light signal of illuminating source, adopt the center carrier frequencies of 10KHZ, regulate with millesimal stepping, obtain good dynamic range, current stability after adjustment is excellent, to illuminating source, overcome utilizing emitted light decay, realize the automatic calibration to illuminating source; Measuring accuracy of the present invention is high, can catch the subtle change of the illumination of luminophor in time, automatically easy to adjust, can directly apply to existing colorimeter, and repacking is convenient, and cost is low.
Accompanying drawing explanation
Fig. 1 is the structural framing figure of the colorimeter of a kind of light path automatic calibration of the present invention;
Fig. 2 is the circuit diagram of compensating light receiver of the present invention;
Fig. 3 is the circuit diagram of light source self-correction control module of the present invention.
Embodiment
Embodiment 1
The colorimeter of a kind of light path automatic calibration that the present embodiment provides, reequip on the basis of original colorimeter, original colorimeter comprises illuminating source, cuvette, correlation optical receiver and data processor, the light signal that illuminating source sends is input to the receiving end of correlation optical receiver by cuvette, and the output terminal of correlation optical receiver and the input end of data processor communicate to connect.When carrying out colour measurement, solution is injected in cuvette, connect the power supply of illuminating source, the light signal sent injects the solution in cuvette, after solution filters, received by correlation optical receiver, and import into data processor, data processor is analyzed the light source received, and obtains the chromatic value of solution in cuvette.
The present embodiment is reequiped above-mentioned colorimeter, adds compensating light receiver and light source self-correction control module, and optimizes the element in above-mentioned colorimeter.
What the element of above-mentioned colorimeter did is optimized for: illuminating source adopts the light emitting diode of the different colours of four high stabilities, is respectively blue LED, and emission wavelength is 460--470nm; Green LED, emission wavelength is 510--530nm; Yellow light-emitting diode, emission wavelength is 580-595nm; Red light emitting diodes, emission wavelength is 615--630nm.Above-mentioned four light emitting diodes all drive luminous by power amplification circuit, during work, only have a lumination of light emitting diode, provide the light source of different wave length, conveniently carry out measuring and verifying.
Correlation optical receiver and illuminating source are arranged at the both sides of cuvette respectively, receive the light signal through filtering.Adopt BPW69A type silicon photocell, it has good Electrophotosensitive in the dynamic range of 400nm-900nm.Cuvette adopts two-way light type quartz colorimetric utensil or four-way light type quartz colorimetric utensil, in order to measurement device solution.Data processor adopts 32 ARM to be the processor of single chip computer of core.
Based on the architectural feature of above-mentioned colorimeter, below the structure and working principle of compensating light receiver and light source self-correction control module is described further.
Compensating light receiver and illuminating source are arranged at the homonymy of cuvette, directly receive the light signal that illuminating source sends.Compensating light receiver comprises vertical type silicon photocell and two-stage amplifier, described vertical type silicon photocell and described two-stage amplifier are connected with data processor after connecting, its circuit diagram as shown in Figure 2, the operational amplifier that vertical type osmanthus photoelectric cell D5 and two-stage TLC2252 form is connected with data processor after connecting, as light emitting diode D1, D2, when D3 or D4 is luminous, utilizing emitted light can shine on vertical type silicon photocell D5, amplify through two-stage after vertical type silicon photocell D5 receiving optical signals, formation voltage is proportional to the AD1 signal of illuminance, AD1 is sent into data processor process.What compensating light receiver obtained is proportional to acting as of the AD1 signal of illuminance: be 1. that when injecting testing liquid, AD1 signal sets up corresponding relation with the optical signal transmissive received through correlation optical receiver in cuvette; When injecting testing liquid in cuvette and starting the measurement of colourity, data processor contrasts according to real-time AD1 signal and initial AD1 signal, if signal is decayed, then can be corrected illuminating source by light path self-correcting circuit, in fact self-correcting control circuit for light source and compensating light acceptor circuit form a complete supervisory circuit, its object is exactly the stability in order to maintain utilizing emitted light illumination, the impact of the photo-labile preventing light from causing due to the effect of heat.
The input end of light source self-correction control module is connected with data processor, and its output terminal is connected with illuminating source, controls the luminous intensity of illuminating source, realizes the automatic calibration of illuminating source.Light source self-correction control module comprises the STM32F103RB chip and at least one road current-limiting circuit that produce pulse width modulating signal, described current-limiting circuit comprises current-limiting resistance and switching tube, the PWM pin of described STM32F103RB chip is connected with described switching tube, described switching tube is connected with described illuminating source, and described illuminating source and described current-limiting resistance are connected with power supply after connecting.In the present embodiment, illuminating source comprises 4 light emitting diodes, described light source self-correction control module comprises the 4 tunnel current-limiting circuits be connected with 4 PWM pins of STM32F103RB chip respectively, switching tube in each road current-limiting circuit is connected with one of them light emitting diode, is connected after the circuit connected in series of above-mentioned light emitting diode therewith in the current-limiting circuit of road with power supply.The circuit of the light source self-correction control module of the present embodiment as shown in Figure 3, first via current-limiting circuit is connected with the pin PWM4 of STM32F103RB chip, comprise switching tube Q1 and current-limiting resistance R1 and resistance R2, be connected with switching tube Q1 after pin PWM4 and the resistance R2 of STM32F103RB chip connect, switching tube Q1 is connected with green LED D1 and switches on power after connecting with current-limiting resistance R1; Second tunnel current-limiting circuit is connected with the pin PWM1 of STM32F103RB chip, comprise switching tube Q2 and current-limiting resistance R3 and resistance R4, be connected with switching tube Q2 after pin PWM1 and the resistance R4 of STM32F103RB chip connect, switching tube Q2 is connected with blue LED D2 and switches on power after connecting with current-limiting resistance R3; 3rd tunnel current-limiting circuit is connected with the pin PWM3 of STM32F103RB chip, comprise switching tube Q3 and current-limiting resistance R5 and resistance R6, be connected with switching tube Q3 after pin PWM3 and the resistance R6 of STM32F103RB chip connect, switching tube Q3 is connected with red light emitting diodes D3 and switches on power after connecting with current-limiting resistance R5; 4th tunnel current-limiting circuit is connected with the pin PWM2 of STM32F103RB chip, comprise switching tube Q4 and current-limiting resistance R7 and resistance R8, be connected with switching tube Q4 after pin PWM2 and the resistance R8 of STM32F103RB chip connect, switching tube Q4 is connected with yellow light-emitting diode D4 and switches on power after connecting with current-limiting resistance R7.4 PWM passages of data processor controlled STM32F103RB chip, each only permission passage output pwm signal, controls one of them lumination of light emitting diode, realizes the constant wavelength of illuminating source, meanwhile, be convenient to the exchange of light sources with different wavelengths.Light source self-correction control module is by four PWM passage output pwm signals, and each passage, by current-limiting resistance, is added to voltage on light emitting diode, is controlled the switch of each switching tube by pwm signal.The principle of work of light source self-correction control module is: the mean value of operating voltage
because
be the dutycycle of PWM, so the mean value of operating voltage
it is exactly the product of dutycycle and high level voltage.Theoretically, because the operating voltage of we VCC is 5V, according to being 2V by pressure drop during current-limiting resistance conducting, the dutycycle of pwm signal is from 1000/0 to thousand, each stepping is per mille, so the voltage that can regulate is 3/1000ths of supply voltage at every turn, degree of regulation is very little for light emitting diode, the preliminary brightness self-correcting of light emitting diode can be completed, simultaneously light source self-correction control module can also and compensating light receiver form the automatic control system of PID (proportion integration differentiation).
In addition, between the correlation optical receiver of the colorimeter of light path automatic calibration of the present invention and data processor, operational amplifier and AD collector are set.It is core that operational amplifier adopts with TLC2252, coordinates, form the circuits sense equipment amplified light signal with resistance capacitance.AD collector TL431A is benchmark, gathers with 12 AD.
The concrete measuring method of colorimeter to the colourity solution comprised in contrast colors ware of above-mentioned light path automatic calibration carries out step and the automatic calibration step of colorimetric analysis, specifically carries out as follows:
Inject distilled water in F1, cuvette, open illuminating source and correlation optical receiver, the light intensity that now correlation optical receiver receives is incident intensity, and incident intensity is transferred to data processor by correlation optical receiver.
While collection incident intensity, automatic calibration is carried out to the intensity of light path, method is: data processor judges incident intensity, if incident intensity is less than preset value, then control the STM32F103RB chip of light source self-correction control module, the center carrier frequencies signal of 10KHZ is exported by PWM pin, voltage is added on light emitting diode by current-limiting resistance by current-limiting circuit, the carrier frequency signaling that STM32F103RB chip exports improves the voltage of light emitting diode both sides with millesimal stepping, until the incident intensity that data processor receives equals preset value.
In addition, compensating light receiver receives light source initial strength, and initial strength is sent to data processor, and light source initial strength is associated with incident intensity relation storing by data processor.
Inject testing liquid in F2, cuvette, open illuminating source and correlation optical receiver, the light intensity that now correlation optical receiver receives is transmitted intensity, and transmitted intensity is transferred to data processor by correlation optical receiver.
Compensating light receiver receives light source Real-time intensity, and light source Real-time intensity is sent to data processor, the light source initial strength of the light source Real-time intensity received and storage contrasts by data processor, if light source Real-time intensity is lower than light source initial strength, then perform automatic calibration step, be specially: the STM32F103RB chip controlling light source self-correction control module, the center carrier frequencies signal of 10KHZ is exported by PWM pin, voltage is added on light emitting diode by current-limiting resistance by current-limiting circuit, the carrier frequency signaling that STM32F103RB chip exports improves the voltage of light emitting diode both sides with millesimal stepping, until the light source Real-time intensity that data processor receives equals light source initial strength.
The proportionate relationship of incident intensity and transmitted intensity set up by F3, data processor, processes light signal according to Bill's Lambert law, extrapolates the chromatic value of solution in cuvette.
F4, complete a colour measurement after, the STM32F103RB chip of data processor controlled light source self-correction control module, opening and closing by PWM pin gauge tap pipe, the illuminating source changing another kind of wavelength carries out luminescence, repeated execution of steps F1, F2, F3, carry out new colour measurement.
In the present embodiment, in step F 1, use distilled water to demarcate colorimeter, under four kinds of colourity, distilled water is demarcated as T=It/I0=100%.In the present embodiment, configuration liquor potassic permanganate has carried out measuring (cuvette with identical), and the data obtaining penetrability T are as follows:
Can obtain according to Bill's Lambert law, colourity A=lg (I0/It)=lg (the 1/T)=K*c*l of liquor potassic permanganate; Proportional coefficient K=[lg (1/T)]/[c*l]; Because use identical cuvette, there is identical light path, can be used as a light path unit.And the volumetric molar concentration of liquor potassic permanganate is the integral multiple of 0.001MOL/L, can using 0.001MOL/L as a unit, therefore, Proportional coefficient K=[lg (1/T)]/[N*0.001MOL/L* light path unit], by obtaining corresponding K value for [unit is: 1/ (0.001mol/l* light path unit)] to the process of above data.
Can find out that the K value of ruddiness to liquor potassic permanganate is 0.15 by above data, the K value of gold-tinted to liquor potassic permanganate is 0.30, and Bill's Lambert law tells us: K is scale-up factor, can be absorption coefficient or molar absorption coefficient.It is relevant with the character of absorbing material and the wavelength X of incident light.Have nothing to do with the intensity of incident light.We see when incident light [red (615--630nm), yellow (580-595nm)] their the K value of same substance (potassium permanganate) to different wave length is different, are respectively 0.15 and 0.30.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of application claims.
Claims (8)
1. the colorimeter of a light path automatic calibration, comprise illuminating source, cuvette, correlation optical receiver and data processor, the light signal that described illuminating source sends is input to the receiving end of described correlation optical receiver by described cuvette, the output terminal of described correlation optical receiver and the input end of described data processor communicate to connect, it is characterized in that, also comprise the light source self-correction control module be connected with data processor and the compensating light receiver directly receiving the light signal that illuminating source sends, described light source self-correction control module comprises the STM32F103RB chip and at least one road current-limiting circuit that produce pulse width modulating signal, described current-limiting circuit comprises current-limiting resistance and switching tube, the PWM pin of described STM32F103RB sheet is connected with described switching tube, described switching tube is connected with described illuminating source, described illuminating source and described current-limiting resistance are connected with power supply after connecting, described compensating light receiver comprises vertical type silicon photocell and two-stage amplifier, described vertical type silicon photocell and described two-stage amplifier are connected with data processor after connecting.
2. the colorimeter of a kind of light path automatic calibration according to claim 1, it is characterized in that, described illuminating source comprises 4 light emitting diodes, described light source self-correction control module comprises the 4 tunnel current-limiting circuits be connected with 4 PWM pins of STM32F103RB chip respectively, switching tube in each road current-limiting circuit is connected with one of them light emitting diode, is connected after the circuit connected in series of above-mentioned light emitting diode therewith in the current-limiting circuit of road with power supply.
3. the colorimeter of a kind of light path automatic calibration according to claim 1 and 2, is characterized in that, described cuvette is two-way light type quartz colorimetric utensil or four-way light type quartz colorimetric utensil.
4. the colorimeter of a kind of light path automatic calibration according to claim 1 and 2, is characterized in that, described correlation optical receiver is BPW69A type silicon photocell.
5. the colorimeter of a kind of light path automatic calibration according to claim 1 and 2, is characterized in that, arranges operational amplifier between described correlation optical receiver and described data processor.
6. the colorimeter of a kind of light path automatic calibration according to claim 1 and 2, is characterized in that, arranges AD collector between described correlation optical receiver and described data processor.
7. a colour measurement method for light path automatic calibration, is characterized in that: the solution comprised in contrast colors ware carries out step and the automatic calibration step of colorimetric analysis, specifically carries out as follows:
Inject distilled water in F1, cuvette, open illuminating source and correlation optical receiver, the light intensity that now correlation optical receiver receives is incident intensity, and incident intensity is transferred to data processor by correlation optical receiver;
While collection incident intensity, automatic calibration is carried out to the intensity of light path, method is: data processor judges the incident intensity in step F 1, if incident intensity is less than preset value, then control the STM32F103RB chip of light source self-correction control module, the center carrier frequencies signal of 10KHZ is exported by PWM pin, voltage is added on light emitting diode by current-limiting resistance by current-limiting circuit, the carrier frequency signaling that STM32F103RB chip exports improves the voltage of light emitting diode both sides with millesimal stepping, until the incident intensity that data processor receives equals preset value,
In addition, compensating light receiver receives light source initial strength, and initial strength is sent to data processor, and light source initial strength is associated with incident intensity relation storing by data processor;
Inject testing liquid in F2, cuvette, open illuminating source and correlation optical receiver, the light intensity that now correlation optical receiver receives is transmitted intensity, and transmitted intensity is transferred to data processor by correlation optical receiver;
Compensating light receiver receives light source Real-time intensity, and light source Real-time intensity is sent to data processor, the light source initial strength of the light source Real-time intensity received and storage contrasts by data processor, if light source Real-time intensity is lower than light source initial strength, then perform automatic calibration step, be specially: the STM32F103RB chip controlling light source self-correction control module, the center carrier frequencies signal of 10KHZ is exported by PWM pin, voltage is added on light emitting diode by current-limiting resistance by current-limiting circuit, the carrier frequency signaling that STM32F103RB chip exports improves the voltage of light emitting diode both sides with millesimal stepping, until the light source Real-time intensity that data processor receives equals light source initial strength,
The proportionate relationship of incident intensity and transmitted intensity set up by F3, data processor, processes light signal according to Bill's Lambert law, extrapolates the chromatic value of solution in cuvette.
8. the colour measurement method of a kind of light path automatic calibration according to claim 7, it is characterized in that, after step F 3 is complete, the STM32F103RB chip of data processor controlled light source self-correction control module, opening and closing by PWM pin gauge tap pipe, the illuminating source changing another kind of wavelength carries out luminescence, and repeated execution of steps F1, F2, F3 carry out new colour measurement.
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| EP0081702A1 (en) * | 1981-11-25 | 1983-06-22 | Kollmorgen Technologies Corporation | Electro-optical system for color monitoring |
| CN2034686U (en) * | 1988-04-19 | 1989-03-22 | 中国科学院声学研究所 | Photo-electricity liquid state colourity detecting installation |
| EP1544604A1 (en) * | 2003-12-17 | 2005-06-22 | Siemens Aktiengesellschaft | Wavelength modulation spectroscopy method |
| CN203455076U (en) * | 2013-07-24 | 2014-02-26 | 江苏苏威尔科技有限公司 | Optical path automatic correction colorimeter |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0081702A1 (en) * | 1981-11-25 | 1983-06-22 | Kollmorgen Technologies Corporation | Electro-optical system for color monitoring |
| CN2034686U (en) * | 1988-04-19 | 1989-03-22 | 中国科学院声学研究所 | Photo-electricity liquid state colourity detecting installation |
| EP1544604A1 (en) * | 2003-12-17 | 2005-06-22 | Siemens Aktiengesellschaft | Wavelength modulation spectroscopy method |
| CN203455076U (en) * | 2013-07-24 | 2014-02-26 | 江苏苏威尔科技有限公司 | Optical path automatic correction colorimeter |
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Denomination of invention: Colorimeter and chrominance measurement method for automatically correcting light path Effective date of registration: 20191216 Granted publication date: 20151118 Pledgee: Nanjing Bank Co., Ltd. Chengnan Branch Pledgor: Jiangsu SWR Science & Technology Co., Ltd. Registration number: Y2019320000363 |
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