CN204214544U - A kind of optical radiation measurement device based on filter unit - Google Patents

Abstract

The invention discloses a kind of optical radiation measurement device based on filter unit, filter unit is corrected on a small quantity by introducing, the spectral power distribution in whole detecting band can be obtained without the need to a large amount of narrow wave band color filter, this spectral power distribution also can be utilized to correct by the actual spectrum response function of feature color-filter unit and the difference of theoretical spectral response function, to the measuring error that photochromism value is introduced, reduce the real color of target to be measured, the information of the aspects such as brightness, be applicable to the detector of nearly all type, and have easy and simple to handle, cost is low, fast response time, accuracy of measurement high.

Description

A kind of optical radiation measurement device based on filter unit

[technical field]

The invention belongs to optical radiation measurement field, be specifically related to a kind of optical radiation measurement device based on filter unit.

[background technology]

Existing optical radiation measurement mainly comprises two kinds of approach, and a kind of is spectral power distribution by measuring target to be measured, obtains photometric and chromatric value; Another kind utilizes photodetector and feature color filter to combine to form various characteristic response function (as CIE colourimetric matching function, (photopic vision/noctovision/mesopic vision) human eye spectral luminous efficiency function etc.), obtain the light quantity and tristimulus values etc. of target to be measured, thus calculate the parameters such as color.Relative to the technical scheme of spectral power distribution accurately measuring target to be measured, the Photodetection system using color filter and photodetector to combine obviously in Measuring Time and cost advantageously.

Traditional utilize photodetector and color filter combination to measure target to be measured mainly to comprise following several method:

(1) a large amount of narrow-cut filter is cut successively (for the visible ray of 380nm-780nm in detector (as silicon photocell, black-white CCD etc.) front setting, for obtaining 10nm precision, 40 transmission regions are at least needed to be the narrow-cut filter of 10nm), detector receives the response under different arrowband respectively, multiple response is integrated, thus realizing the measurement of spectral power distribution in detecting band, recycling spectral power distribution obtains various photochromism value.The method needs a large amount of narrow-cut filter mutually to switch, and not only cost is high, and device is complicated, complex operation, length consuming time.

(2) in the front setting respectively of detector (as silicon photocell, black-white CCD etc.), there is the color filter of different spectral response characteristic, response function and the different color filter of detector itself form different combination spectrum response functions, to realize the measurement of different photochromism value.The method cannot obtain the spectral power distribution of target to be measured, and be limited by the many factors such as technique, environment, cost, detector and color filter combine differing greatly of the actual spectrum response function that forms and theoretical response function (as CIE tristimulus values spectral response functions), cause accuracy of measurement low, the accurate fields of measurement that requirement is higher can not be used for.

In addition, notification number is that CN201464052U also discloses a kind of multispectral look radiation temperature measurement device based on colored CCD, by arranging the color filter of a triple channel narrow-band spectrum transmitance response characteristic before colored CCD, three above-mentioned narrow-band spectrum transmitance responses have red, green, blue three unimodal centre wavelengths, during measurement, light is by this color filter, the measuring-signal of the different spectrum of multichannel can be obtained simultaneously, realize the measurement of colour temperature, can meet the measurement demand of temperature field, but the method can not be used for the occasion needing more multispectral survey.

In a word, prior art or adopt the higher spectrometer of testing cost or accuracy of measurement is low or complex operation or test function single, the effects such as accuracy of measurement is high, powerful, easy to operate, cost is low cannot be had concurrently.

[summary of the invention]

For the deficiencies in the prior art, the present invention aims to provide a kind of optical radiation measurement device quick, accurate, applied widely, utilize limited correction filter unit can realize the high-precision rapid survey of the spectral power distribution of target to be measured, and based on the spectral power distribution recorded and theory characteristic response function, deviation between effective correction photodetector actual measurement response and true value, realizes the Measurement accuracy of different response.

The present invention is achieved through the following technical solutions: a kind of optical radiation measurement method based on filter unit, it is characterized in that, comprise one or more probe unit, n (n >=2) plants feature color-filter unit, the individual correction filter unit of m (m >=2), the combination spectrum response of known probe unit and feature color-filter unit and the transmitance of correction filter unit; Feature color-filter unit be set before probe unit and correct filter unit, being combined by both and obtain the multiple actual measurement response of target to be measured; In wave band to be measured, choose one or more sample area, according to the actual measurement response expression formula Simultaneous Equations of correspondence, calculate the spectral power distribution in wave band to be measured.

The present invention by arranging feature color-filter unit and correcting filter unit before probe unit, and target to be measured is detected unit and receives, to obtain multiple actual measurement responses of target to be measured under different characteristic color-filter unit and difference correct the compound action of filter unit; Due to the corresponding specific wave band to be measured of actual measurement response, several sample area are chosen in wave band to be measured, thus above-mentioned actual measurement response by the combination spectrum response and sample area that correct the transmitance of filter unit, probe unit and feature color-filter unit averaged spectrum power carry out mathematical expression, again by the mathematic(al) representation simultaneous equations of above-mentioned difference actual measurement response, the average power of each sample area can be solved, and then obtain the spectral power distribution of target to be measured in wave band to be measured.

Compared to the prior art only arranging feature color-filter unit before probe unit, this technical scheme is on the prior art basis that traditional color-filter unit and probe unit combine, introduce innovatively and correct filter unit on a small quantity, the high precision spectral power distribution of target to be measured can be obtained, and obtain more high-precision characteristic response value with this, without the need to conventional spectrometers and other complex configurations, there is the features such as accuracy of measurement is high, easy and simple to handle, powerful, cost is low.

The present invention also limits by following technical scheme and perfect further:

Arranged by the combination of m correction filter unit and determine corresponding wave band to be measured, the concrete steps obtaining the spectral power distribution of wave band to be measured are as follows:

1a) under same feature color-filter unit, one or more corrects a certain actual measurement response obtaining target to be measured under filter unit, under the effect of different characteristic color-filter unit, to obtain in wave band to be measured n and survey response A ₁... A _k..., A _n;

In wave band to be measured, 1c) choose w (1≤w≤n) individual sample area, select w to survey response expression formula Simultaneous Equations, calculate the average power P (λ of sample area ₁) ... P (λ _i) ..., P (λ _w), namely obtain the spectral power distribution in wave band to be measured.

In wave band to be measured, probe unit is as follows in the actual measurement response expression formula through a kth feature color filter:

$A_k=\underset{i=1}{\overset{w}{\mathrm{\Σ}}}P\left({\mathrm{\λ}}_i\right)I_k\left({\mathrm{\λ}}_i\right)\mathrm{\τ}\left({\mathrm{\λ}}_i\right)\mathrm{\Δ}{\mathrm{\λ}}_i---\left(1\right)$

Wherein Δ λ _ithe scope of i-th sample area, P (λ _i) be average power in i-th sample area, I _k(λ _i) be at Δ λ _ithe combination spectrum response of an interior kth feature color-filter unit and probe unit, τ (λ _i) be correct filter unit at Δ λ _iinterior transmitance.

It is to be noted, the number of selectable sample area depends on the quantity of feature color-filter unit, the sample area number selected in wave band to be measured should be less than or equal to the quantity of feature color-filter unit, the kind of feature color-filter unit determines the number of sample area actual measurement response expression formula, particularly, the w≤n in visible (1).If the sample area chosen is greater than the quantity of feature color-filter unit, then the quantity of unknown number (average power of sample area) is greater than the quantity of equation, and system of equations cannot solve.

In wave band to be measured, sampling interval Δ λ _iwith combination spectrum response I _k(λ _i) can have and different choose mode.Δ λ _ican equidistantly or non-equidistance choose, sample area is not overlapping mutually and all sample area sums cover whole correction wave band.I _k(λ _i) then got, at Δ λ by the spectral response functions combination of feature color-filter unit and probe unit _iin wave band, I _k(λ _i) being generally fixed value, this fixed value can be that feature color-filter unit and probe unit are at Δ λ _ithe mean value of the spectral response functions in wave band, also can be the response that both combination spectrum response functions are a bit located, or be the weighted value of combination spectrum response function.

For a certain correction wave band 400nm-440nm, comprise 4 kinds of feature color-filter units, in this wave band to be measured, choose 4 sample area (w=4):

◆ these 4 sample area can equidistantly be chosen, and are respectively 400nm-410nm, 410nm-420nm, 420nm-430nm and 430nm-440nm, then Δ λ ₁, Δ λ ₂, Δ λ ₃with Δ λ ₄be 10nm, P (λ ₁), P (λ ₂), P (λ ₃) and P (λ ₄) be the averaged spectrum power of 400nm-410nm, 410nm-420nm, 420nm-430nm and 430nm-440nm respectively, and I _k(λ ₁), I _k(λ ₂), I _k(λ ₃) and I _k(λ ₄) be that the combination spectrum response of probe unit and feature color-filter unit is at the mean value of 400nm-410nm, 410nm-420nm, 420nm-430nm and 430nm-440nm respectively.

◆ these 4 sample area also can be chosen by non-equidistance, are respectively 400nm-404nm, 404nm-412nm, 412nm-424nm and 424nm-440nm, then Δ λ ₁, Δ λ ₂, Δ λ ₃with Δ λ ₄be respectively 4nm, 8nm, 12nm and 16nm, P (λ ₁), P (λ ₂), P (λ ₃) and P (λ ₄) be the averaged spectrum power of 400nm-404nm, 404nm-412nm, 412nm-424nm and 424nm-440nm respectively, and I _k(λ ₁), I _k(λ ₂), I _k(λ ₃) and I _k(λ ₄) be respectively 400nm-404nm, 404nm-412nm, 412nm-424nm and 424nm-440nm averaged spectrum response.

Described wave band to be measured can be the transmission region of bandpass filter, or the combination transmission region of bandpass filter and/or long pass filter and/or short pass filter.Especially, in wavelength band to be measured, beyond all combination transmission regions, also can correct wave band as one.Now, surveying response is the response that the overall response value of not correction up optical filter deducts in all combination transmission regions.Such as, wavelength band to be measured is 400nm ~ 600nm, the bandpass filter of 400nm ~ 440nm can be adopted, the long pass filter of cutoff wavelength 460nm and the short pass filter of cutoff wavelength 500nm combine, the bandpass filter of 500nm ~ 600m and the short pass filter of cutoff wavelength 540nm combine, the bandpass filter of 500nm ~ 600nm and the long pass filter of cutoff wavelength 560nm combine selects 400nm ~ 440nm respectively, 460nm ~ 500nm, 500nm ~ 540nm, the correction wave band of 560nm ~ 600nm, 440nm ~ 460nm beyond all combination transmission regions, 540nm ~ 560nm can correct wave band as one jointly.

The selection of wave band to be measured can be arranged at equiwavelength interval in whole wavelength band to be measured, to obtain the spectral power distribution at equiwavelength interval, or correct band setting in the diff area of feature color filter, to obtain the maximum error of actual characteristic response function and theory characteristic response function, obtain calibration response value more accurately.Described feature color filter diff area is that the array response function of feature color filter and probe unit is greater than the scope of predetermined value with the direct difference of theoretical response function or weighted difference.

After the spectral power distribution obtaining target to be measured, the known described theory characteristic function corresponding to feature color-filter unit, spectral power distribution in detecting band is combined with corresponding theory characteristic function, calculates characteristic response value, be i.e. various photochromism value.Such as, theory characteristic function behaviour eye spectral luminous efficiency function, then can obtain various shading value; Theory characteristic function is CIE colourimetric matching function, then can obtain tristimulus values corresponding to target to be measured.Due to spectral power distribution directly and the weighting of theory characteristic function or integration, can obtain photochromism value accurately, accuracy of measurement is high.

According to spectral power distribution and the theory characteristic function of target to be measured, spectrum resolution correction coefficient K is utilized to revise actual measurement response to obtain the theoretical response value of pin-point accuracy, this spectrum resolution correction coefficient is obtained, shown in specific as follows by the combination spectrum RESPONSE CALCULATION of the spectral power distribution of target to be measured and scaling light source, theory characteristic function, probe unit and feature color-filter unit:

$K=\frac{\underset{\mathrm{\λ}1}{\overset{\mathrm{\λ}2}{\∫}}P{\left(\mathrm{\λ}\right)}_{t}L\left(\mathrm{\λ}\right)\mathrm{d\λ}\underset{\mathrm{\λ}1}{\overset{\mathrm{\λ}2}{\∫}}P{\left(\mathrm{\λ}\right)}_S{I}_k\left(\mathrm{\λ}\right)\mathrm{d\λ}}{\underset{\mathrm{\λ}1}{\overset{\mathrm{\λ}2}{\∫}}P{\left(\mathrm{\λ}\right)}_t{I}_k\left(\mathrm{\λ}\right)\mathrm{d\λ}\underset{\mathrm{\λ}1}{\overset{\mathrm{\λ}2}{\∫}}P{\left(\mathrm{\λ}\right)}_{S}L\left(\mathrm{\λ}\right)\mathrm{d\λ}}$

Wherein, P (λ) _tfor the spectral power distribution of target to be measured, L (λ) is theory characteristic response function, I _k(λ) be the combination spectrum response function of probe unit and feature color-filter unit, P (λ) _sfor the spectral power distribution of scaling light source, (λ 1, λ 2) is the detecting band of probe unit.

Correction feature response directly can utilize spectral power distribution to obtain theoretical response value within the scope of whole detecting band, also can by calculating the response error in each correction wavelength band, actual measurement response is corrected, now, the selection correcting wave band should be arranged in the diff area of characteristic response function.

As a kind of technical scheme, the known described theory characteristic function corresponding to feature color-filter unit, utilizes the actual measurement response of the spectral power distribution correcting detection unit in detecting band:

3a) do not cut correction filter unit, obtain all band actual measurement response under this feature color-filter unit;

Under same feature color-filter unit, 3b) obtain the actual measurement response in m wave band to be measured, calculate its theoretical response value according to the spectral power distribution in wave band to be measured with corresponding theory characteristic function simultaneously, thus obtain the response error in this wave band to be measured;

3c) utilize 3b) in response error correction all band actual measurement response, all band calibration response value in whole detecting band can be obtained.

This technical scheme obtain spectral power distribution basis on, the response of further correcting detection unit, i.e. the photochromism value of target to be measured.The combination spectrum response function of such as probe unit and certain feature color-filter unit is CIE colourimetric matching function curve, then can obtain accurately value; If curve, then can obtain accurately value; If curve, then can obtain accurately value.

The invention also discloses a kind of measurement mechanism for realizing above-mentioned optical radiation measurement method, it is characterized in that, comprise one or more probe unit, n (n >=2) plants feature color-filter unit, the individual correction filter unit of m (m >=2), the combination spectrum response of known probe unit and feature color-filter unit and the transmitance of correction filter unit; Before probe unit, arrange feature color-filter unit and correct filter unit, light is detected unit and receives after overcorrect filter unit and feature color-filter unit.

As a kind of technical scheme, described correction filter unit is bandpass filter; Or correct the combination that filter unit is bandpass filter and/or long pass filter and/or short pass filter.Usually, in detecting band, arrange bandpass filter, or long logical color filter and short logical color filter combination form the logical region of band, the transmission region of bandpass filter or the logical region of band are positioned at the detecting band of probe unit; In addition, long logical color filter and short logical color filter can also be set respectively at detecting band two ends, to avoid the light outside detecting band to introduce parasitic light, guarantee accuracy of measurement.The present invention has no particular limits the quantity correcting filter unit, usually, in visible light wave range, corrects quantity m≤10 of filter unit, while meeting spectral resolution, effectively reduces Measuring Time, equipment cost and instrument volume.

Feature color-filter unit of the present invention can have the technical scheme of multiple realization, such as: described feature color-filter unit and the combination spectrum of probe unit respond and respond for simulating CIE tristimulus values, then can obtain tristimulus values corresponding to target to be measured; Or described feature color-filter unit and the combination spectrum of probe unit respond as to simulate human eye spectral luminous efficiency function, can obtain various shading value; Feature color-filter unit can also comprise the color filter that transmitance perseverance is 1, i.e. through hole.Corresponding, described theory characteristic function can comprise multiple technologies scheme, and such as theory characteristic function is the CIE color matching functions of tristimulus values or is CIE photopic vision human eye spectral luminous efficiency function etc.

As a kind of technical scheme, described correction filter unit is arranged on correcting wheel, by the switching of correcting wheel, difference is corrected filter unit and is cut in the light path before probe unit.Correcting wheel can be circular wheel dish, and different correction filter units is cut in light path by the mode of rotating by successively, or is cut into respectively in light path by alternate manner.Feature color-filter unit also can be arranged on colour wheel, is cut in light path by the mode similar with correcting filter unit, or relative with probe unit fixing.

The present invention is by comparing the combination spectrum response function of probe unit and feature color-filter unit and theory characteristic function, and determine according to comparative result the setting position correcting filter unit, to reach the technical purpose utilizing a small amount of correction filter unit can obtain chromaticity value accurately.In actual measurement, m correct filter unit can have multiple set-up mode in detecting band, such as equiwavelength's spacing arrange or arranged evenly according to diff area:

If a the transmission region interval of () multiple correction filter unit is identical, 6 transmission regions are such as had to be the bandpass filter of 40nm, wavelength interval is 20nm, transmission region is respectively 420nm-460nm, 480nm-520nm, 540nm-580nm, 600nm-640nm, 660nm-700nm, 720nm-760nm, if comprise four kinds of feature color-filter units, then according to the method obtaining spectral power distribution, the spectral power distribution of 10nm bandwidth can be obtained in each transmission region.

B () or multiple correction filter unit are arranged evenly according to diff area.In detecting band, the wave band that the direct difference of combination spectrum response function and corresponding theory characteristic function thereof or weighted difference are greater than predetermined value is defined as diff area, in detecting band, comprise one or more diff area, correction filter unit is arranged in diff area.Obtain theoretical response value by the spectral power distribution that calculates and theoretical response function, utilize the error correction overall response value of theoretical response value and actual measurement response.It is pointed out that diff area here directly can judge from the difference of actual spectrum response function and theory characteristic function; Or consider the impact of target light spectral power distributions to be measured, the difference according to both weightings judges.For the latter, owing to cannot learn the accurate spectral power distribution of light source to be measured, the prerequisite of the program is that the experience spectral power distribution of known light to be measured (such as most incandescent lamp be continuous light spectral power distributions, LED occur peak value etc. at blue light components) judges diff area.

Probe unit in the present invention is the minimal set of the opto-electronic conversion obtaining light response to be measured, and it can be one or more single channel photodetector composition, or probe unit is the various photodetection components and parts such as multichannel light electric explorer.Silicon photocell is typical single channel photodetector, when utilizing it to carry out colour measurement, to simulate CIE colourimetric matching function R (λ), G (λ), B (λ) three color filters be separately positioned on silicon photocell before, obtain tristimulus values, i.e. three responses; But, practical combinations spectral response functions and CIE colourimetric matching function difference larger, tint volume accurately cannot be realized measure, utilize measuring method provided by the invention, the correction of tristimulus values can be realized by cutting a small amount of correction filter unit (as bandpass filter), easy to operate, cost is low, accuracy of measurement is high.

CCD is typical multichannel light electric explorer, the general colored CCD of analog color response characteristic that adopts realizes color measuring at present, its different color response is with different characteristic color-filter unit is corresponding above, before colored CCD, bandpass filter is set, according to spectral measurement method disclosed by the invention, the spectral power distribution in each colour element under different band-pass filter can be obtained, namely obtain EO-1 hyperion.The technical scheme of traditional acquisition EO-1 hyperion, by arranging multiple narrow wave band band-pass filter before black-white CCD, to obtain the averaged spectrum power under this narrow wave band; And technical scheme of the present invention, by broadband band-pass filter, multiple averaged spectrum power under utilizing the response in each colour element to calculate this broadband, as described above, by choosing multiple sampled point, the multiple averaged spectrum power under this broadband band-pass filter can be obtained, refinement spectral power distribution.Particularly, to obtain the spectral power of 10nm bandwidth in visible light wave range (380nm-780nm), utilizing conventional solution then to need the band-pass filter of 40 10nm, the averaged spectrum power of 10nm bandwidth could be obtained; If utilize technical scheme of the present invention, the detector array that colored CCD responds for simulation R (λ), G (λ), B (λ), add through hole, be equivalent to be provided with the color filter that spectral response functions perseverance is 1, always have 4 constraint conditions, to realize the spectral power of 10nm bandwidth, the band-pass filter of 6 40nm is then needed to realize, under the prerequisite guaranteeing accuracy of measurement, significantly decrease the quantity of band-pass filter, simplify measuring system, improve measurement efficiency, reduce measurement cost.

The invention has the beneficial effects as follows and correct filter unit on a small quantity by introducing, the spectral power distribution in whole detecting band can be obtained without the need to dispersion element or a large amount of narrow wave band color filter, this spectral power distribution also can be utilized to correct the measuring error introduced by the difference of actual spectrum response function and theoretical spectral response function, reduce the information of the aspects such as the real color of target to be measured, brightness, be applicable to the detector of nearly all type, and have easy and simple to handle, cost is low, fast response time, accuracy of measurement high.

[accompanying drawing explanation]

Accompanying drawing 1 is the schematic diagram of colored CCD pixel response.

Accompanying drawing 2 is schematic diagram of color matching functions and colored CCD real response function;

Accompanying drawing 3 is that utilization corrects the spectral power distribution of filter unit acquisition and comparing of actual light spectral power distributions;

Accompanying drawing 4 is schematic diagram of the optical radiation measurement device based on filter unit;

Accompanying drawing 5 is the schematic diagram of the correction filter unit that correcting wheel is arranged.

1-probe unit; 2-feature color-filter unit; 3-corrects filter unit; 4-correcting wheel; 5-driving mechanism.

[embodiment]

Embodiment 1

The present embodiment is the optical radiation measurement method based on filter unit, comprise probe unit 1,3 kind of feature color-filter unit 2,5 corrects filter unit, correcting filter unit 3 for transmission region is spaced apart the bandpass filter of 60nm, as shown in Figure 1, probe unit 1 is detector array, detector array and 3 kinds of feature color-filter units 2 combine and form colored CCD, and its combination spectrum response function is respectively R (λ), G (λ) and B (λ).

As shown in Figure 2,5 correct filter unit 3 and detecting band are divided into 9 regions respectively, 400nm-460nm, 460nm-480nm, 480nm-540nm, 540nm-560nm, 560nm-620nm, 620nm-640nm, 640nm-700nm, 700nm-760nm respectively, the transmission region wherein correcting filter unit 3 is respectively 400nm-460nm, 480nm-540nm, 560nm-620nm, 640nm-700nm and 700nm-760nm, and the transmitance of its correspondence is respectively τ ₁(λ), τ ₂(λ), τ ₃(λ), τ ₄(λ) and τ ₅(λ).For above-mentioned transmission region and alternatively non-transparent wave band, the present invention all can obtain its spectral power distribution, and then can obtain the spectral power distribution of whole detecting band, and detailed process is as follows:

For the spectral power distribution of transmission region, for 400nm-460nm, be τ in transmitance ₁(λ) same correction filter unit 3,3 kind of feature color-filter unit 2 combine lower acquisition 3 actual measurement response R ₁, G ₁and B ₁, in 400nm-460nm wave band, choose 3 sample area, be respectively 400nm-420nm, 420nm-440nm and 440nm-460nm, then Δ λ ₁, Δ λ ₂with Δ λ ₃be 20nm, P (λ ₁), P (λ ₂) and P (λ ₃) be the averaged spectrum power of 400nm-420nm, 420nm-440nm and 440nm-460nm respectively, and R (λ _i), G (λ _i) and B (λ _i) be respectively the combination spectrum response of probe unit 1 and feature color-filter unit 2 at the mean value of 400nm-420nm, 420nm-440nm and 440nm-460nm, then the expression formula Simultaneous Equations of 3 actual measurement responses, as shown in the formula described:

$\left\{\begin{array}{c}{R}_1=P\left({\mathrm{\λ}}_1\right)R\left({\mathrm{\λ}}_1\right){\mathrm{\τ}}_1\left(\mathrm{\λ}\right)\mathrm{\Δ}{\mathrm{\λ}}_1+P\left({\mathrm{\λ}}_2\right)R\left({\mathrm{\λ}}_2\right){\mathrm{\τ}}_1\left(\mathrm{\λ}\right)\mathrm{\Δ}{\mathrm{\λ}}_2+P\left({\mathrm{\λ}}_3\right)R\left({\mathrm{\λ}}_3\right){\mathrm{\τ}}_1\left(\mathrm{\λ}\right)\mathrm{\Δ}{\mathrm{\λ}}_3\\ G_1=P\left({\mathrm{\λ}}_1\right)G\left({\mathrm{\λ}}_1\right){\mathrm{\τ}}_1\left(\mathrm{\λ}\right)\mathrm{\Δ}{\mathrm{\λ}}_1+P\left({\mathrm{\λ}}_2\right)G\left({\mathrm{\λ}}_2\right){\mathrm{\τ}}_1\left(\mathrm{\λ}\right)\mathrm{\Δ}{\mathrm{\λ}}_2+P\left({\mathrm{\λ}}_3\right)G\left({\mathrm{\λ}}_3\right){\mathrm{\τ}}_1\left(\mathrm{\λ}\right)\mathrm{\Δ}{\mathrm{\λ}}_3\\ B_1=P\left({\mathrm{\λ}}_1\right)B\left({\mathrm{\λ}}_1\right){\mathrm{\τ}}_1\left(\mathrm{\λ}\right)\mathrm{\Δ}{\mathrm{\λ}}_1+P\left({\mathrm{\λ}}_2\right)B\left({\mathrm{\λ}}_2\right){\mathrm{\τ}}_1\left(\mathrm{\λ}\right)\mathrm{\Δ}{\mathrm{\λ}}_2+P\left({\mathrm{\λ}}_3\right)B\left({\mathrm{\λ}}_3\right){\mathrm{\τ}}_1\left(\mathrm{\λ}\right)\mathrm{\Δ}{\mathrm{\λ}}_3\end{array}\right.$

According to above formula, P (λ can be calculated ₁), P (λ ₂) and P (λ ₃), namely calculate 400nm-420nm, 420nm-440nm and average light spectral power distributions corresponding to 440nm-460nm wave band.Similarly, respectively under the effect of different correction filter units 3, obtain the spectral power distribution in all correction filter unit 3 transmission regions.

For in detecting band, correct the wave band outside filter unit 3 transmission region, i.e. 460nm-480nm, 540nm-560nm and 620nm-640nm, 5 are being corrected the actual measurement response sum obtained after filter unit 3 cuts light path all successively, with the difference of not placing the total actual measurement response correcting filter unit 3, be the actual measurement response of above-mentioned wave band, then under different characteristic color-filter unit 2 acts on, obtain 3 kinds of actual measurement responses, by 460nm-480nm, 540nm-560nm and 620nm-640nm wave band are as sample area, the then expression formula Simultaneous Equations of 3 actual measurement responses, as shown in the formula described:

$\left\{\begin{array}{c}R-\underset{i=1}{\overset{5}{\mathrm{\Σ}}}\frac{R_i}{{\mathrm{\τ}}_i\left(\mathrm{\λ}\right)}=P^{\′}\left({\mathrm{\λ}}_1\right)R^{\′}\left({\mathrm{\λ}}_1\right)\mathrm{\Δ}{\mathrm{\λ}}_1^{\′}+P^{\′}\left({\mathrm{\λ}}_2\right)R^{\′}\left({\mathrm{\λ}}_2\right)+P^{\′}\left({\mathrm{\λ}}_3\right)R^{\′}\left({\mathrm{\λ}}_3\right)\mathrm{\Δ}{\mathrm{\λ}}_3^{\′}\\ G-\underset{i=1}{\overset{5}{\mathrm{\Σ}}}\frac{G_i}{{\mathrm{\τ}}_i\left(\mathrm{\λ}\right)}=P^{\′}\left({\mathrm{\λ}}_1\right)G^{\′}\left({\mathrm{\λ}}_1\right)\mathrm{\Δ}{\mathrm{\λ}}_1^{\′}+P^{\′}\left({\mathrm{\λ}}_2\right)G^{\′}\left({\mathrm{\λ}}_2\right)\mathrm{\Δ}{\mathrm{\λ}}_2^{\′}+P^{\′}\left({\mathrm{\λ}}_3\right)G^{\′}\left({\mathrm{\λ}}_3\right)\mathrm{\Δ}{\mathrm{\λ}}_3^{\′}\\ B-\underset{i=1}{\overset{5}{\mathrm{\Σ}}}\frac{B_i}{{\mathrm{\τ}}_i\left(\mathrm{\λ}\right)}=P^{\′}\left({\mathrm{\λ}}_1\right)B^{\′}\left({\mathrm{\λ}}_1\right)\mathrm{\Δ}{\mathrm{\λ}}_1^{\′}+P^{\′}\left({\mathrm{\λ}}_2\right)B^{\′}\left({\mathrm{\λ}}_2\right)\mathrm{\Δ}{\mathrm{\λ}}_2^{\′}+P^{\′}\left({\mathrm{\λ}}_3\right)B^{\′}\left({\mathrm{\λ}}_3\right)\mathrm{\Δ}{\mathrm{\λ}}_3^{\′}\end{array}\right.$

The averaged spectrum power of 460nm-480nm, 540nm-560nm and 620nm-640nm is calculated according to above formula, the spectral power distribution corrected in filter unit (3) transmission region with each combines, and can obtain the spectral power distribution in whole detecting band.As shown in Figure 3, in figure "-●-" be the averaged spectrum power in above-mentioned sample area, and solid line is theoretical light spectral power distributions, both compare and can find out, the devices such as unfavorable spectrometer, adopt optical radiation measurement method of the present invention, accurately can obtain the spectral power distribution in wave band to be measured.In like manner, can said method be utilized, obtain the spectral power distribution in detecting band, outside transmission region, thus obtain the spectral power distribution in whole detecting band.

After the spectral power distribution obtaining target to be measured, utilize the response of the further correcting detection unit 1 of spectral power distribution, i.e. the photochromism value of target to be measured.Being a certain feature color-filter unit 2 of R (λ) with the combination spectrum response function of probe unit (1), its actual measurement of the acquisition obtained under certain corrects the effect of filter unit 3 (such as transmission region is 400nm-460nm) response R ₁, the theory characteristic function corresponding to this feature color-filter unit 2 known is the theoretical response value R that X (λ) obtains this feature color-filter unit 2 ₁':

R ₁′＝P(λ ₁)X(λ ₁)τ ₁(λ)Δλ ₁+P(λ ₂)X(λ ₂)τ ₁(λ)Δλ ₂+P(λ ₃)X(λ ₃)τ ₁(λ)Δλ ₃

Then the response error of this certain correction filter unit is Δ R ₁=R ₁'-R ₁, utilize this response error and the total actual measurement response R of this feature color-filter unit 2 of recoverable when not cutting correction filter unit 3.Further, can correct in different correction filter units 3, utilize cumulative correction error to obtain the total actual measurement response R ' after correction:

$R^{\′}=R+\underset{i=1}{\overset{5}{\mathrm{\Σ}}}\mathrm{\Δ}{R}_i$

Similarly, the actual measurement response under above-mentioned bearing calibration can be utilized to correct different characteristic color-filter unit 2, obtains measured value accurately.

Actual measurement response, corrected value and theoretical value thereof under table 1 different characteristic color-filter unit 2

Characteristic response value	Measured value	Corrected value	Theoretical value
				R	116.50	81.01	84.89
G	69.90	51.63	48.34
				B	82.23	71.21	71.71

On from table can find out, compared to measured value, the response after correction accurately can reflect real theoretical response value, and namely above-mentioned bearing calibration can obtain response more accurately.

Embodiment 2

The present embodiment is the optical radiation measurement device based on color-filter unit, comprise probe unit 1,4 kind of feature color-filter unit 2,5 corrects filter unit 3, correcting wheel 4 and driving mechanism 5, correcting filter unit 3 for transmission region is spaced apart the bandpass filter of 60nm, 5 are corrected filter unit 3 and are arranged on correcting wheel 4, are cut into successively in light path by driving mechanism 5; Correcting wheel 4, feature color-filter unit 5 are inwardly arranged successively relative to probe unit 1, probe unit 1 is detector array, feature color-filter unit 2 is three color filters and a through hole, three color filters and detector array combine and form colored CCD, and namely its combination spectrum response function is respectively R (λ), G (λ) and B (λ).Before probe unit 1, arrange feature color-filter unit 2 and correct filter unit 3, light is detected unit 1 and receives after overcorrect filter unit 3 and feature color-filter unit 2.Concrete method of testing is with embodiment 1.

Claims (8)

1. the optical radiation measurement device based on filter unit, it is characterized in that, comprise one or more probe unit (1), n kind feature color-filter unit (2), m correction filter unit (3), wherein n >=2, m >=2, the combination spectrum response of known probe unit (1) and feature color-filter unit (2) and the transmitance of correction filter unit (3); Probe unit (1) front arrange feature color-filter unit (2) and correct filter unit (3), light be detected after overcorrect filter unit (3) and feature color-filter unit (2) unit (1) reception.

2. optical radiation measurement device as claimed in claim 1, it is characterized in that, described correction filter unit (3) is bandpass filter; Or correct the combination that filter unit (3) is bandpass filter and/or long pass filter and/or short pass filter.

3. optical radiation measurement device as claimed in claim 1, is characterized in that, in visible light wave range, and quantity m≤10 of described correction filter unit (3).

4. optical radiation measurement device as claimed in claim 1, it is characterized in that, comprise correcting wheel (4), described correction filter unit (3) is arranged on correcting wheel (4), by the switching of correcting wheel (4), difference is corrected filter unit and is cut in the front light path of probe unit (1).

5. optical radiation measurement device as claimed in claim 1, is characterized in that, described probe unit (1) is one or more single channel photodetector composition; Or described probe unit (1) is multichannel light electric explorer.

6. the optical radiation measurement device as described in claim 1 or 5, is characterized in that, described probe unit (1) is detector array, and detector array and feature color-filter unit (2) combine and form colored CCD.

7. optical radiation measurement device as claimed in claim 1, it is characterized in that, described feature color-filter unit (2) comprises the color filter that spectral response functions perseverance is 1, i.e. through hole.

8. optical radiation measurement device as claimed in claim 1, is characterized in that, described feature color-filter unit (2) is three kinds of feature color-filter units (2) of imitative CIE tristimulus values response.