CN101718586B - Method and system for calibrating standard colorimetric plate for cotton colorimeter - Google Patents
Method and system for calibrating standard colorimetric plate for cotton colorimeter Download PDFInfo
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- CN101718586B CN101718586B CN2009101551689A CN200910155168A CN101718586B CN 101718586 B CN101718586 B CN 101718586B CN 2009101551689 A CN2009101551689 A CN 2009101551689A CN 200910155168 A CN200910155168 A CN 200910155168A CN 101718586 B CN101718586 B CN 101718586B
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Abstract
The invention provides a special method for calibrating a standard colorimetric plate for a cotton colorimeter, comprising the following steps: irradiating a standard white plate with symmetric visible light source in the 45-degree angle direction; receiving and focusing reflected light and eliminating parasitic light; transmitting the reflected light signal; obtaining the reflected signal intensity of each wavelength of the standard colorimetric plate to be tested; and calibrating the reflectance of each wavelength of the standard colorimetric plate. The invention also provides a system for calibrating the standard colorimetric plate for the cotton colorimeter, comprising a microprocessor, a testing bench, a symmetric continuous spectrum visible light source, a first optical system; a second optical system, a monochromator, a photomultiplier tube, an amplifier and an analog/digital converter. The amplified electrical signal is sampled under the control of the microprocessor and is transmitted to the microprocessor. The testing condition is closer to the cotton color testing condition, is beneficial to controlling the cotton colorimeter calibration precision and is available to the more accurate test and calibration of the standard colorimetric plate of different area.
Description
Technical field
The present invention relates to the scaling method and the system of standard colorimetric plate for cotton colorimeter.
Background technology
The Colour Measurement of cotton is an important evidence of cotton classification.As the spectral luminous efficiency characteristic of the necessary comprehensively human eye of the colorimeter instrument of cotton color measurement and the spectral characteristic of its lighting source, measuring system should meet the illumination and the dimensional measurement condition of international standard simultaneously, could estimate objectively and the test data that exchanges cotton color.The demarcation of cotton color instrument is the method that adopts Standard colour board, present domestic institute accepted standard colour table is to be directed to the Standard colour board that U.S. Uster company is provided substantially, therefore in the development process of homemade cotton color instrument, develop Standard colour board voluntarily and will no longer need import U.S. Uster company standard colour table, simultaneously for the measuring accuracy that guarantees homemade cotton color instrument, improve the production domesticization degree of homemade cotton color instrument, the capability of independent innovation of cotton inspection industry and the degree of self-sufficiency of crucial common technology and product are significant, and to the canonical measure of standard colorimetric plate for cotton colorimeter and the development of calibration system, be the basis and the guarantee of above-mentioned work.
The canonical measure of the general colour table that in the past appeared in the newspapers and calibration system adopt spectrophotometer method.Spectrophotometer is a kind of surveying instrument with discontinuous wavelength sampling reflecting object or transparent objects.Because the structure difference of different objects molecule, also different with receptivity to the reflection of different wave length light, therefore, every kind of object all has specific reflection and transmitted spectrum.Can from the mixed spectra that contains various wavelength, separate, and the instrument of measuring its transmission and reflection characteristic is called spectrophotometer with monochromatic wavelength.
The employed wavelength coverage difference of spectrophotometer, can be divided into ultraviolet spectrum, visible spectrum, infrared spectrum and all band spectrum, therefore, spectrophotometer can be divided into visible spectrophotometer, ultraviolet spectrophotometer, fluorospectrophotometer, infrared spectrophotometer etc.Be which kind of spectrophotometer mainly all is made up of light source, monochromator, slit, absorber detector system 5 parts.
Spectrophotometer provides usually uses the white-light illuminating light source.And the reflected light that comprises the refraction of diffusion back, and allow to measure the light summation that when discontinuous wavelength, reflects.Spectrophotometric accuracy is by the several factors decision, but one of most important factor is spectral band (i.e. the scope of every some wavelength in measured spectrum).Use spectrophotometer can draw absorption spectrum curve, medium with spike spectrophotometric method curve requires spectrophotometer can pass through narrow wave band, typical wavelength interval is 1nm, and 5nm, comparatively cheap instrument usually can be by the bandwidth of 10nm or 20nm.
Common spectrophotometer measurement object color and luster adopts following structure and principle: after lighting source entered monochromator, its output light was monochromatic light.Monochromatic light enters optical system thereafter, this optical system is mainly chopper and catoptron is formed, when chopper rotates minute surface with respect to illuminated object be 0 ° angle with beam reflection to standard, light beam is not being that 0 ° angle incides sample surfaces with respect to illuminated object when having minute surface, after being integrated the ball mixed light, its emission light receives and is converted to electric signal by PMT, measurement data by contrast standard and sample like this, the spectral reflectance of calculation sample, thus demarcate Standard colour board.Its defective is: be not suitable for the colour table demarcation that cotton color is measured on the one hand, in addition, the zone of measured object is very little, and for colour table, its measured value can not reflect the overall condition of colour table, influences the accuracy that colour table is demarcated.
Summary of the invention
Technical matters to be solved by this invention provides a kind of scaling method that is exclusively used in standard colorimetric plate for cotton colorimeter.For this reason, the present invention is by the following technical solutions: it may further comprise the steps:
1), approach 1 standard white plate by 45 ° of direction illumination spectra reflectance ρ std (λ) with the visible light source of symmetry, and at the reflected light of 0 ° of corner connection receipts standard white plate,
2), reception, focus reflection light and eliminate parasitic light, transmit reflected light signal then,
3), receiving step 2) reflected light signal that transmits, assemble and enter monochromatic system and eliminate second order spectrum,
4), described reflected light signal adopted the scan-type order is monochromatic to be handled, make described reflected light signal be treated to the different wave length monochromatic light of at interval certain wavelength jump output according to sequential,
5), the monochromatic light signal of step 4) is converted to electric signal and output,
6), amplification procedure 5) electric signal of output, sample and send Computer Processing to,
7), by COMPUTER CALCULATION, obtain the reflected signal strength of standard white plate on each wavelength,
8), standard colorimetric plate for cotton colorimeter to be measured is measured according to step 1)-step 7), obtain the reflected signal strength of standard colorimetric plate for cotton colorimeter on each wavelength to be measured,
9), by computing machine according to standard white plate at reflected signal strength on each wavelength and the reflected signal strength of standard colorimetric plate for cotton colorimeter on each wavelength to be measured, demarcate the reflectance on each wavelength of standard colorimetric plate for cotton colorimeter.
Owing to adopt technical scheme of the present invention, light source irradiation angle and reflected light acceptance angle by the most suitable cotton color measurement, can suit the actual conditions that cotton color is measured most, and can make the part of colour table or All Ranges all by light source irradiation according to test request, and be suitable for distance adjustment to colour table and reflected light acceptance point, make the reflected light of colour table effective coverage of required test to be received, thereby improve the accuracy that colour table is demarcated.
Further, in step 8), at first determine the area to be measured of standard colorimetric plate for cotton colorimeter to be measured, the distance between position and the standard colorimetric plate for cotton colorimeter to be measured is received in catoptrical 0 ° of corner connection of regulating standard colorimetric plate for cotton colorimeter to be measured, and the reflected light of the detected part of corresponding area to be measured all is received.
Further, in step 8), receive the intensity of the distance adjusting visible light source of the distance between position and the standard colorimetric plate for cotton colorimeter to be measured according to catoptrical 0 ° of corner connection, the electrical signal amplitude that makes output that light signal is changed is complementary with amplification and sampling process to electric signal, and the maximum reflection signal on each wavelength that Standard colour board to be measured is exported in the time of can obtaining to sample after the coupling reaches the full scale of sampling input.
Another technical matters to be solved of the present invention provides a kind of calibration system of realizing the standard colorimetric plate for cotton colorimeter of above-mentioned scaling method.For this reason, the present invention is by the following technical solutions: it comprises:
Microprocessor,
The test board of colour table, test board are provided with colour table and place the position,
With demarcate the Symmetrical Continuous spectrum visible light source that the position of colour table on fixed mechanism is 45 ° of illumination angles;
Be first optical system that the reflected light of described colour table is focused on and eliminates parasitic light at 0 ° of angle with the position of colour table to be calibrated on fixed mechanism;
Second optical system, the light signal convergence that optical fiber is exported enters monochromator and eliminates second order spectrum,
Be provided with the optical fiber of light conducting signal between first optical system and second optical system,
Monochromator, described monochromator are accepted the light signal of second optical system output, and by described microprocessor control, the monochromatic light of the at interval certain wavelength jump output in scan-type ground different wave length;
Photomultiplier receives described monochromatic light and is converted to electric signal;
Amplifier, to the electric signal amplification of photomultiplier output,
Analog/digital converter, by the control of described microprocessor down to the electric signal sampling of amplifying and send microprocessor to,
The distance of the colour table placement position on described first optical system and the test board is adjustable.
Because adopt technical scheme of the present invention, calibration system provided by the present invention has the following advantages:
1, employing double light path 45 degree throw light on and receive at 0 degree, and its test condition more approaches the test condition of cotton color, helps the stated accuracy of cotton color instrument;
2, can adjust the tested area that arrives of tested colour table institute by adjusting the distance of first optical system and tested colour table, so this system can test the Standard colour board of different area, the colour table demarcation is more accurate.
3, because light signal that first optical system obtains is the mean value of bigger tested area, so its light signal is more uniform and stable.
When adopting technique scheme, the calibration system of standard colorimetric plate for cotton colorimeter provided by the present invention also can adopt following further technical scheme:
The blue green light cutoff filter that described second optical system is eliminated second order spectrum by lens and being used for is formed.
Described first optical system is made up of lens, light hurdle and integral mirror.Like this, can the parasitic light beyond the field angle be shielded, have better optics anti-interference function.
Colour table on described first optical system and the test board is placed the distance adjustment of position and control by described controller, and the intensity of described visible light source is adjustable and controlled by described controller.According to the area size of colour table detected part and regulating and controlling, the intensity of described visible light source is adjustable and a distance of being placed according to the colour table on first optical system and the test board by described controller and regulating and controlling by described controller for the distance that colour table on described first optical system and the test board is placed the position.Like this, when tested colour table size changes, by regulating the measuring distance of first optical system, variation that can adaptive coloration board test area, and because test area changes the change that will cause received light signal strength, light signal is at process optical fiber, second optical system, monochromator and photomultiplier, behind amplifier and the ADC, the variation of its signal power can be differentiated by microprocessor, by the control of microprocessor, can make light source reach optimization state and the intensity that is fit to calibration system.
Description of drawings
Fig. 1 is the system schematic of the calibration system embodiment of standard colorimetric plate for cotton colorimeter provided by the present invention.
Fig. 2 is the synoptic diagram of first optical system.
Fig. 3 is the synoptic diagram of second optical system.
Embodiment
With reference to accompanying drawing.The calibration system of standard colorimetric plate for cotton colorimeter provided by the present invention comprises:
Microprocessor, microprocessor are at first born the control of the monochromator length scanning in the system, gain control, signal sampling and with the data communication facility of computing machine; Further, microprocessor also can be born the distance control of the colour table placement position on described first optical system and the test board, the light intensity control of visible light source.
The test board 1 of colour table 2, test board are provided with colour table and place the position.
With demarcate the symmetrical visible light source 31,32 that the position of colour table on fixed mechanism is 45 ° of illumination angles.
Be first optical system that the reflected light of described colour table is focused at 0 ° of angle with the position of colour table to be calibrated on fixed mechanism; Described first optical system is made up of lens 41, light hurdle 42 and integral mirror 43.
Second optical system can make the light signal convergence by optical fiber output enter monochromatic system and eliminate second order spectrum; Described second optical system by lens 51 and the blue green light cutoff filter 52 that is used for eliminating second order spectrum form.
Be provided with the optical fiber 6 of light conducting signal between first optical system and second optical system,
Monochromator, described monochromator are accepted the light signal of second optical system output, and by described microprocessor through the wavelength control unit controls, the at interval certain wavelength jump in scan-type ground is exported the monochromatic light of different wave length;
Photomultiplier PMT receives described monochromatic light and is converted to electric signal;
Amplifier, to the electric signal amplification of photomultiplier output,
Analog/digital converter ADC, ADC is sampled to the electric signal that amplifies down by described microprocessor control and is transferred to computing machine through interfaces such as RS232/USB, after analyzing as calculated, can analyze the spectral characteristic of tested colour table.
The distance of the colour table placement position on described first optical system and the test board is adjustable.Colour table on described first optical system and the test board is placed the distance adjustment of position and is controlled by described controller, the adjusting of described distance can be by placing the position adjustment or realizing by the position adjustment to first optical system to colour table, such as, colour table is placed the position and is arranged on the feed screw nut device, by microprocessor by the control of motor being controlled the rotational angle of leading screw, place the adjustment of position to realize colour table, perhaps first optical system is installed on the mount pad by driven by motor, by the position adjustments of mount pad is controlled in the control of motor, thereby regulate first optical system is placed the position with respect to colour table distance.The distance that colour table on described first optical system and the test board is placed the position by described controller according to colour table area size to be measured and regulating and controlling can both be received the reflected light of the active component to be measured of corresponding area to be measured by first optical system.
The intensity of described visible light source also is adjustable, and realize by control light source driving circuit by described controller, and realize constant current output, the distance that described controller is placed according to the colour table on first optical system and the test board and to intensity of light source regulating and controlling to light source.
Described Symmetrical Continuous spectrum visible light source 31,32 is for being connected in series, can guarantee that so two light source works are under identical working current, because its luminous flux is to measure in advance and pairing, therefore the two light sources that adopted are under identical drive current, its luminous flux is approaching, two like this light sources are basic identical from the light intensity that 2 miter angle degree shine the test position, guaranteed homogeneity.
At timing signal, can adopt following steps:
1), approaches 1 standard white plate by 45 ° of direction illumination spectra reflectance ρ std (λ), and receive the reflected light of standard white plate 0 ° of corner connection with the visible light source 31,32 of described symmetry.
2), by first optical system receive, focus reflection light is to described optical fiber 6, transmits reflected light signals by optical fiber 6.
3), receive the reflected light signal that optical fiber 6 transmits by second optical system.
4), under the control of microprocessor, described reflected light signal adopted by monochromator that the scan-type order is monochromatic to be handled, make described reflected light signal be treated to the different wave length monochromatic light of at interval certain wavelength jump output according to sequential.
The order of scanning can be from the shortwave direction progressively to the long wave scanning direction, and its sweep spacing can determine according to actual needs, for example 1nm, 5nm, 10nm, 20nm etc.
5), the monochromatic light signal of step 4) is converted to electric signal and output, by photomultiplier
6), by amplifier amplification procedure 5) electric signal of output, under the control of microprocessor, be Sstd (λ) by ADC sampling, sampled value, be transferred to computing machine through interfaces such as RS232/USB.
7), by COMPUTER CALCULATION, obtain the reflected signal strength of standard white plate on each wavelength,
In scanning process to standard white plate, by microprocessor control the electric signal by PMT output is sampled after amplifying, its sampled value is Sstd (λ).
The testing tool constant K (λ) of calculating on each wavelength is: K (λ)=Pe (λ) ρ std (λ)/Sstd (λ), and wherein Pe (λ) is the spectral power distribution of lighting source, ρ std (λ) is the spectral reflectance of standard white plate visible light wave range.
8), standard colorimetric plate for cotton colorimeter to be measured is measured according to step 1)-step 7), obtain the reflected signal strength of standard colorimetric plate for cotton colorimeter on each wavelength to be measured,
In scanning process to standard colorimetric plate for cotton colorimeter, by microprocessor control the electric signal by PMT output is sampled after amplifying, its sampled value is S (λ).
9), by computing machine according to standard white plate at reflected signal strength on each wavelength and the reflected signal strength of standard colorimetric plate for cotton colorimeter on each wavelength to be measured, demarcate standard colorimetric plate for cotton colorimeter.
The standard colorimetric plate for cotton colorimeter spectral reflectance ρ (λ) of required demarcation.By K (λ)=Pe (λ) ρ (λ)/S (λ) as can be known:
ρ(λ)＝ρstd(λ)/Sstd(λ)×S(λ)
Replenish standard colorimetric system according to CIE1964 and calculate colour table XYZ tristimulus values.
In step 8), at first determine the area to be measured of standard colorimetric plate for cotton colorimeter to be measured, by microprocessor according to area to be measured, the distance between position and the standard colorimetric plate for cotton colorimeter to be measured is received in catoptrical 0 ° of corner connection of regulating standard colorimetric plate for cotton colorimeter to be measured, and the reflected light of the detected part of corresponding area to be measured is all received by first optical system.
In step 8), also following processing can carried out: according to the distance of the distance between first optical system and the standard colorimetric plate for cotton colorimeter to be measured, further regulate the intensity of visible light source again, the electrical signal amplitude exported among the PMT and thereafter amplification sampling process are complementary, maximum reflection signal on each wavelength that Standard colour board to be measured is exported in the time of can obtaining to sample after the coupling reaches the full scale of sampling input, improves sampling precision.
Claims (9)
1. the scaling method of standard colorimetric plate for cotton colorimeter is characterized in that it may further comprise the steps:
1), approach 1 standard white plate by 45 ° of direction illumination spectra reflectance ρ std (λ) with the visible light source of symmetry, and at the reflected light of 0 ° of corner connection receipts standard white plate,
2), reception, focus reflection light and eliminate parasitic light, transmit reflected light signal then,
3), receiving step 2) reflected light signal that transmits, assemble and enter monochromatic system and eliminate second order spectrum,
4), described reflected light signal adopted the scan-type order is monochromatic to be handled, make described reflected light signal be treated to the different wave length monochromatic light of at interval certain wavelength jump output according to sequential,
5), the monochromatic light signal of step 4) is converted to electric signal and output,
6), amplification procedure 5) electric signal of output, sample and send Computer Processing to,
7), by COMPUTER CALCULATION, obtain the reflected signal strength of standard white plate on each wavelength,
8), the standard white plate in step 1)-step 7) is replaced with standard colorimetric plate for cotton colorimeter to be measured, and measure, obtain the reflected signal strength of standard colorimetric plate for cotton colorimeter on each wavelength to be measured according to step 1)-step 7),
9), by computing machine according to standard white plate at reflected signal strength on each wavelength and the reflected signal strength of standard colorimetric plate for cotton colorimeter on each wavelength to be measured, demarcate the reflectance on each wavelength of standard colorimetric plate for cotton colorimeter.
2. the scaling method of standard colorimetric plate for cotton colorimeter as claimed in claim 1, it is characterized in that in step 8), determine the area to be measured of standard colorimetric plate for cotton colorimeter to be measured, the distance between position and the standard colorimetric plate for cotton colorimeter to be measured is received in catoptrical 0 ° of corner connection of regulating standard colorimetric plate for cotton colorimeter to be measured, and the reflected light of the detected part of corresponding area to be measured all is received.
3. the scaling method of standard colorimetric plate for cotton colorimeter as claimed in claim 2, it is characterized in that in step 8), receive the intensity of the distance adjusting visible light source of the distance between position and the standard colorimetric plate for cotton colorimeter to be measured according to catoptrical 0 ° of corner connection, the electrical signal amplitude that makes output that light signal is changed is complementary with amplification and sampling process to electric signal, and the maximum reflection signal on each wavelength that Standard colour board to be measured was exported when the coupling back obtained sampling reaches the full scale of sampling input.
4. realize the calibration system of the standard colorimetric plate for cotton colorimeter of the described scaling method of claim 1, it is characterized in that it comprises:
Microprocessor,
The test board of colour table, test board are provided with colour table and place the position,
Be the Symmetrical Continuous spectrum visible light source of 45 ° of illumination angles with the position of colour table on fixed mechanism;
Be first optical system that the reflected light of described colour table is focused on and eliminates parasitic light at 0 ° of angle with the position of colour table on fixed mechanism;
Second optical system, the light signal convergence that optical fiber is exported enters monochromator and eliminates second order spectrum,
Be provided with the optical fiber of light conducting signal between first optical system and second optical system,
Monochromator, described monochromator are accepted the light signal of second optical system output, and by described microprocessor control, the monochromatic light of the at interval certain wavelength jump output in scan-type ground different wave length;
Photomultiplier receives described monochromatic light and is converted to electric signal;
Amplifier, to the electric signal amplification of photomultiplier output,
Analog/digital converter, by the control of described microprocessor down to the electric signal sampling of amplifying and send microprocessor to,
The distance of the colour table placement position on described first optical system and the test board is adjustable.
5. the calibration system of standard colorimetric plate for cotton colorimeter as claimed in claim 4, it is characterized in that described second optical system by lens and the blue green light cutoff filter that is used for eliminating second order spectrum form.
6. the calibration system of standard colorimetric plate for cotton colorimeter as claimed in claim 4 is characterized in that described first optical system is made up of lens, light hurdle and integral mirror.
7. the calibration system of standard colorimetric plate for cotton colorimeter as claimed in claim 4, it is characterized in that colour table on described first optical system and the test board places the distance adjustment of position and controlled by controller, the intensity of described visible light source is adjustable and by described controller control.
8. the calibration system of standard colorimetric plate for cotton colorimeter as claimed in claim 4, it is characterized in that distance that colour table on described first optical system and the test board places the position by controller according to colour table area size to be measured and regulating and controlling.
9. the calibration system of standard colorimetric plate for cotton colorimeter as claimed in claim 4 is characterized in that described Symmetrical Continuous spectrum visible light source is for being connected in series.
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| CN2009101551689A CN101718586B (en) | 2009-12-07 | 2009-12-07 | Method and system for calibrating standard colorimetric plate for cotton colorimeter |
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| CN2009101551689A CN101718586B (en) | 2009-12-07 | 2009-12-07 | Method and system for calibrating standard colorimetric plate for cotton colorimeter |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103344337B (en) * | 2013-06-21 | 2015-03-18 | 杭州新叶光电工程技术有限公司 | Cotton color instrument with LED lighting source |
| CN104048760A (en) * | 2014-06-11 | 2014-09-17 | 江阴市纤维检验所 | Objective ranking method for cotton color levels |
| CN108279032B (en) * | 2018-01-17 | 2023-09-15 | 歌尔科技有限公司 | Product performance testing method and system |
| CN110706473B (en) * | 2019-09-06 | 2021-06-11 | 南京工程学院 | Gas data acquisition device and data acquisition method based on single-wavelength reflection |
| CN111521297B (en) * | 2020-04-28 | 2021-04-06 | 北京航空航天大学 | Spectrum-temperature calibration device and method suitable for phosphorescence ratio light intensity method |
| CN112161708B (en) * | 2020-09-30 | 2023-03-24 | 湖南福瑞印刷有限公司 | Spectrum preprocessing method for calculating color tristimulus values |
| CN112683826A (en) * | 2020-12-24 | 2021-04-20 | 广电计量检测（重庆）有限公司 | Correction method and device of calibration color plate for percutaneous jaundice tester |
| CN114486754B (en) * | 2022-01-11 | 2023-09-15 | 中国测试技术研究院 | Method for eliminating influence of light source fluctuation on object chromaticity measurement based on normalization coefficient |
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