CN111504465A - Colorimeter matching method, colorimeter correction method and system - Google Patents

Abstract

The invention provides a colorimeter matching method, a colorimeter correction method and a colorimeter correction system, wherein the colorimeter matching method comprises the following steps: acquiring the through optical core diameter of the optical fiber input end, determining the field angle of the optical fiber input end based on the through optical core diameter of the optical fiber input end and determining the field angle of the lens based on the field angle of the optical fiber input end; controlling target light rays emitted by the area to be detected to enter the lens at an angle of field and then enter the input end of the optical fiber at an angle of field so that the target light rays are emitted from the output end of the optical fiber; and controlling the target light emitted from the output end of the optical fiber to be incident to the spectrometer, wherein the end face profile of the output end of the optical fiber is matched with the slit profile of the receiving end of the spectrometer. The invention solves the problem of low measurement efficiency caused by poor light receiving capability of the colorimeter in the prior art.

Description

Colorimeter matching method, colorimeter correction method and system

Technical Field

The invention relates to the field of colorimeters, in particular to a colorimeter matching method, a colorimeter correction method and a colorimeter correction system.

Background

With the gradual improvement of quality evaluation systems of luminescent products such as color displays, illumination light sources and the like, accurate measurement of color and brightness of the displays and the like becomes more and more important, and the color measurement is mainly performed by a tristimulus-value type colorimeter. A colorimeter refers to a laboratory instrument that measures or specifies color by comparison with synthetic pigments. A typical colorimeter has a standard light source, three colored filters, photocells, and a standard reflective panel, and more advanced colorimeters have photocells and electronic circuitry instead of the human eye as the receptor, thus speeding up the acquisition of results. The result of colorimetry is called chroma (chroma).

The widely used types of tristimulus-value measuring devices are mainly classified into two types, a filter colorimeter and a spectral colorimeter. The filter type colorimeter directly obtains X (red), Y (green) and Z (blue) tristimulus values based on a CIE color matching function and R, G, B three-primary-color filters matched with human cone cells in color. The spectral colorimeter forms a continuous spectrum in a visible waveband by using grating or prism light splitting, and then calculates X, Y, Z tristimulus values according to the CIE1931 standard.

At present, high yield and high quality are required in industrial production, and therefore, a colorimeter is required to have high measurement speed and high measurement accuracy and repeatability under low light. Therefore, the colorimeter needs to collect the light emitted from the screen or the light source to be measured as much as possible and transmit the collected light to the photosensitive chip in its entirety under the condition that the exposure time is the same. However, the spectral colorimeter collects a relatively small amount of light, resulting in relatively low measurement efficiency.

Thus, there is a need for a colorimeter matching method based on colorimeters to efficiently collect transmitted light.

Disclosure of Invention

The invention aims to provide a colorimeter matching method, a colorimeter correction method and a colorimeter correction system, which are used for solving the problem that in the prior art, the light receiving capacity of a spectral colorimeter is poor, so that the measurement efficiency is low.

It is a further object of the present invention to improve the accuracy of colorimeter measurements.

To achieve the above object, the present invention is realized by:

in a first aspect, a colorimeter matching method is provided, the method comprising:

acquiring the through optical core diameter of an optical fiber input end, determining an opening angle of the optical fiber input end based on the through optical core diameter of the optical fiber input end and determining a field angle of a lens based on the opening angle of the optical fiber input end;

controlling target light rays emitted by a region to be detected to enter the lens at the field angle and then enter the input end of the optical fiber at the field angle so as to enable the target light rays to be emitted from the output end of the optical fiber;

and controlling the target light emitted from the output end of the optical fiber to enter a spectrometer, wherein the end face profile of the output end of the optical fiber is matched with the slit profile of the receiving end of the spectrometer.

As a further improvement of the present invention, the determining the opening angle of the input end of the optical fiber based on the pass optical core diameter of the input end of the optical fiber comprises:

acquiring the clear aperture of the lens and the numerical aperture of the optical fiber;

determining a focal length of a lens based on the clear aperture and the numerical aperture

θ is an aperture angle of the input end of the optical fiber, NA is a numerical aperture of the optical fiber, and D is a clear aperture of the lens;

determining an opening angle of the optical fiber input end based on a pass optical core diameter of the optical fiber input end and the focal length

Wherein α is β/2, α is the angle of view of the lens, and d is the pass optical core diameter of the input end of the optical fiber.

As a further improvement of the invention, the contour of the slit at the receiving end of the spectrometer is rectangular;

the end surface profile of the output end of the optical fiber is rectangular formed by arranging a plurality of sub optical fibers.

In a second aspect, the present invention provides a colorimeter correction method applied to the method of the first aspect, the correction method including:

acquiring a preset wavelength value corresponding to a characteristic peak of light emitted by an auxiliary light source;

acquiring spectral data of the spectrometer to determine a wavelength value corresponding to each characteristic peak based on the spectral data;

and determining a wavelength fitting correction value based on the preset wavelength value and the wavelength value corresponding to each characteristic peak, so as to correct the target measurement value of the spectrometer based on the wavelength fitting correction value.

As a further improvement of the present invention, before acquiring the preset wavelength value corresponding to the characteristic peak of the auxiliary light source, the method includes:

and starting the auxiliary light source to preheat the auxiliary light source within a preset time.

In a third aspect, the present invention also provides a colorimeter comprising:

the lens is used for receiving target light rays emitted by a region to be measured, wherein the target light rays are incident to the lens at the angle of field of the lens;

an optical fiber for receiving a target ray emitted by the lens, wherein the target ray is incident on the input end of the optical fiber at an opening angle of the input end of the optical fiber, the opening angle is determined based on a clear core diameter of the input end of the optical fiber, and the field angle is determined based on the opening angle; and

a spectrometer for receiving the target light emitted from the output end of the optical fiber;

and the end face contour of the output end of the optical fiber is matched with the slit contour of the receiving end of the spectrometer.

As a further improvement of the invention, the opening angle of the input end of the optical fiber

The field angle α of the lens is β/2;

wherein d is the through optical core diameter of the optical fiber input end, f is the focal length of the lens, and

d is the clear aperture of the lens, θ is the aperture angle of the input end of the optical fiber, and θ ═ arcsin (NA), NA is the numerical aperture of the optical fiber.

As a further improvement of the invention, the contour of the slit at the receiving end of the spectrometer is rectangular;

the end surface profile of the output end of the optical fiber is rectangular formed by arranging a plurality of sub optical fibers.

In a fourth aspect, there is provided a colorimeter correction system applied to the colorimeter of the third aspect, the correction system including:

the acquisition unit is used for acquiring a preset wavelength value corresponding to a characteristic peak of light emitted by the auxiliary light source and acquiring spectral data of the spectrometer;

the data processing unit is used for determining a wavelength value corresponding to each characteristic peak according to the spectral data and determining a wavelength fitting correction value according to the preset wavelength value and the wavelength value corresponding to each characteristic peak;

and the spectrometer receives the wavelength fitting correction value to correct the target measurement value according to the wavelength fitting correction value.

As a further improvement of the invention, the method also comprises the following steps:

the collimating lens is used for receiving the light rays emitted by the auxiliary light source and emitting collimated light rays to the dodging sheet; and

and the light homogenizing sheet is used for converting the collimated light rays emitted by the collimating lens into uniform light rays so as to obtain the target light rays.

The invention has the beneficial effects that:

the colorimeter matching method obtains the field angle of the optical fiber input end through the through optical core diameter of the optical fiber input end, determines the field angle of the lens according to the field angle of the optical fiber input end, enables target light to enter the lens at the field angle and then enter the input end of the optical fiber at the field angle, and enables the size of light spots to be within the outline range of the optical fiber input end, so that the optical fiber input end can receive all the target light, and the light intensity of the light entering a spectrometer through the optical fiber output end is improved. In addition, the end face contour of the output end of the optical fiber is set to be matched with the slit contour of the receiving end of the spectrometer, so that the light intensity of the target light received by the spectrometer can be further improved. Therefore, it is not difficult to find that the light receiving capacity of the colorimeter can be effectively improved by the colorimeter matching method, so that the measurement efficiency of the colorimeter is improved.

Further, the colorimeter correction method of the invention determines a wavelength value corresponding to each characteristic peak according to the acquired spectral data, and determines a wavelength fitting correction value according to a preset wavelength value and the wavelength value corresponding to each characteristic peak, so as to write the wavelength fitting correction value into the spectrometer, thereby reducing the wavelength deviation value. Compared with the wavelength deviation value before correction, the wavelength deviation value after correction is greatly reduced after the wavelength of the target light measured by the colorimeter is corrected by the colorimeter correction method. In this way, the spectrum corrects the target measurement value of the colorimeter according to the obtained wavelength fitting correction value, so that the accuracy of the brightness and color coordinates measured by the colorimeter is improved.

Drawings

FIG. 1 is a schematic diagram of optical path transmission according to one embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a colorimeter according to one embodiment of the present invention;

FIG. 3 is a schematic diagram of a spot converging to the input end of an optical fiber;

FIG. 4 is a schematic block diagram of the input end of an optical fiber according to one embodiment of the present invention;

FIG. 5 is a schematic block diagram of a cross-sectional profile of a fiber optic housing and an end face profile of an output end of an optical fiber according to the prior art;

FIG. 6 is a schematic position structure diagram of a light spot and a receiving end of a spectrometer in the prior art;

FIG. 7 is a schematic comparison of an end face profile of an output end of an optical fiber to a slit profile of a receiving end of a spectrometer according to one embodiment of the invention;

FIG. 8 is a schematic block diagram of the cross-sectional profile of the fiber optic housing and the end face profile of the fiber optic output end of one embodiment of the present invention;

FIG. 9 is a schematic cross-sectional view of an end face interface at the output end of an optical fiber using an FC interface;

FIG. 10 is a schematic block diagram of a female header of the FC interface;

FIG. 11 is a schematic comparison of the end face profile of the output end of an optical fiber and the slit profile at the receiving end of a spectrometer according to another embodiment of the present invention;

FIG. 12 is a graph of a standard Gaussian distribution curve corresponding to when the end face profile of the output end of the optical fiber matches the slit profile of the receiving end of the spectrometer and a Gaussian distribution curve corresponding to when the end face profile of the output end of the optical fiber does not match the slit profile of the receiving end of the spectrometer;

FIG. 13 is a schematic block diagram of a colorimeter calibration system according to one embodiment of the present invention;

FIG. 14 is a graph of wavelength deviation versus wavelength data before calibration;

FIG. 15 is a graph showing the relationship between the corrected wavelength deviation and the wavelength data;

FIG. 16 is a schematic flow chart of a colorimeter matching method according to one embodiment of the invention;

FIG. 17 is a schematic flow chart of a colorimeter matching method according to another embodiment of the invention;

fig. 18 is a schematic flow chart of a colorimeter correction method according to an embodiment of the invention.

Detailed Description

The present invention is described in detail with reference to the embodiments shown in the drawings, but it should be understood that these embodiments are not intended to limit the present invention, and those skilled in the art should understand that functional, methodological, or structural equivalents or substitutions made by these embodiments are within the scope of the present invention.

The technical solutions provided by the embodiments of the present invention are described in detail below with reference to the accompanying drawings.

Generally, the core diameter of the input end of the optical fiber is relatively small, and the light emitted to the input end of the optical fiber after passing through the lens is generally difficult to be incident exactly within the profile range of the input end of the optical fiber, so that the light quantity received by the optical fiber is relatively small. Moreover, the slit length (generally 1mm) at the receiving end of the spectrometer is relatively small, and light emitted through the optical fiber is difficult to align with the spectrometer. This results in a relatively poor light-receiving capability of the spectral colorimeter.

To solve the above technical problem, as described with reference to fig. 1 and 2, an embodiment of the invention provides acolorimeter 100 including alens 20 for receiving target light emitted from an area to be measured 10, wherein the target light enters thelens 20 at a field angle α of the lens, anoptical fiber 30 for receiving the target light emitted from thelens 20, wherein the target light enters aninput end 301 of theoptical fiber 30 at an angle β of an input end of the optical fiber, the angle β is an angle of spread of an optical fiber optical core diameter d to a center of thelens 20, which is determined based on the optical core diameter d of the input end of the optical fiber, and the field angle α is determined based on the angle β, and aspectrometer 40 for receiving the target light emitted from anoutput end 302 of the optical fiber.

Wherein, the target light A, A ' (the target light a and the target light a ' are parallel) and B are incident on thelens 20, the angle formed by the target light A, A ' and B and the optical axis C is the field angle α, the angle formed by the two opposite edges of the target light a and the target light B respectively incident on theoptical fiber 30 through the center of thelens 20 and the center of thelens 20 is the field angle β of theinput end 301 of theoptical fiber 30, the field angle of the input end of the optical fiber

The angle of view α of the lens is β/2. d is the diameter of the optical core at the input end of the optical fiber, f is the focal length of the lens, and

d is the clear aperture of the lens, θ is the aperture angle of the input end of the optical fiber, and θ ═ arcsin (NA), NA is the numerical aperture of the optical fiber.

It will be appreciated that the spot of the target light that is focused by thelens 20 onto theinput end 301 of thefiber 30 is shown in figure 3. In the embodiment of the present invention, simulation is performed by using Zemax software based on the size of the optical fiber 30 (generally, 1mm) of the optical core diameter d, so that the diameter of the formed circular light spot is not greater than 1mm, so as to obtain the corresponding end surface position of theinput end 301 of theoptical fiber 30. As shown in fig. 4, a circular spot-size end profile 303 is formed as the end profile of theinput end 301 of theoptical fiber 30 by selecting a plurality of sub-fibers having core diameters of 10um to 50um to arrange. Here, since the end surface profile of theoutput end 302 of theoptical fiber 30 is the same as the end surface profile of theinput end 301 of theoptical fiber 30 in the prior art, the end surface profile of theoutput end 302 of theoptical fiber 30 is also circular. In one embodiment, the slit width of the receivingend 401 of thespectrometer 40 is enlarged to enable the light spot formed by the target light emitted from theoutput end 302 of theoptical fiber 30 to fall within the slit profile of the receivingend 401 of thespectrometer 40, so as to improve the light receiving capability of the colorimeter, and thus improve the measurement efficiency of the colorimeter.

It should be noted that the end profile of theoutput end 302 of theoptical fiber 30 and the end profile of theinput end 301 of theoptical fiber 30 are both cross-sectional profiles formed by a plurality of sub-optical fibers arranged. While the outer perimeter of the fiber optic bulk housingcross-sectional profile 304 is circular in shape, as shown in fig. 5.

Therefore, thecolorimeter 100 according to the embodiment of the invention determines the field angle β of the optical fiber input end through the optical core diameter d of the optical fiber input end, determines the field angle α of thelens 20 according to the field angle β of the optical fiber input end, and enables the size of the light spot of the target light ray which enters theinput end 301 of theoptical fiber 30 through the field angle β after entering thelens 20 through the field angle α to be within the profile range of the optical fiber input end, so as to ensure that the optical fiber input end can receive all the target light rays, thereby improving the light intensity of the light ray which enters the spectrometer through the optical fiber output end and improving the light collection capability of the colorimeter.

It should be noted that, the control target light ray is incident on thelens 20 at the field angle α and then is incident on theinput end 301 of theoptical fiber 30 at the field angle β, and it can be expanded to be explained that the control target light ray is incident on thelens 20 at the field angle α or less, so that the target light ray is incident on theinput end 301 of theoptical fiber 30 at the field angle β or less, it is understood that, in order to ensure that theinput end 301 of theoptical fiber 30 can receive all or most of the target light rays, the field angle β determined by the optical core diameter d of the input end of the optical fiber is the maximum field angle value, so that, when the control target light ray is incident on theoptical fiber 30 through thelens 20, the light spot size can be made within the profile range of the input end of the optical fiber with the optical core diameter d as long as the target light ray is incident on theinput end 301 of theoptical fiber 30 at the field angle β or less, thereby ensuring that the input end of the optical fiber can receive all the target light rays.

Referring to fig. 6, the end profile of the optical fiber in the prior art (i.e. theend profile 303 of the circular light spot size formed by arranging a plurality of sub-optical fibers) is generally circular, and theslit profile 402 of the spectrometer receiving end is rectangular, i.e. the slit of the spectrometer receiving end is a rectangular slit (generally, the rectangular slit is a strip with a length of 1mm and a width of several tens to several hundreds of micrometers). Since the spot shape (circular) of the light exiting from the fiber does not match the slit profile (rectangular) of the spectrometer, the spectrometer receives less light exiting from the fiber and the light acceptance of the spectrocolorimeter is poorer. Even in the embodiment of expanding the slit width at the receiving end of the spectrometer, since the end profile of the optical fiber does not match the slit profile of the spectrometer and is limited by the wavelength precision, the slit width at the receivingend 401 of thespectrometer 40 is generally expanded to not more than 500um, and therefore, thespectrometer 40 cannot effectively collect the target light emitted from the output end of the optical fiber, and further cannot maximally collect the target light emitted from the output end of the optical fiber. It should be noted that the slit profile at the receiving end of the spectrometer refers to a cross-sectional profile at the receiving end of the spectrometer that can receive the light emitted from the output end of the optical fiber.

In order to maximize the collection of the target light rays exiting the output end of the optical fiber by the spectrometer, in thecolorimeter 100 of an embodiment of the invention, the end face profile of theoutput end 302 of the optical fiber is matched to the slit profile of the receivingend 401 of thespectrometer 40. Specifically, the shape of the end face profile of theoutput end 302 of the optical fiber is the same as or similar to the shape of the slit profile of the receivingend 401 of thespectrometer 40, and the size of the end face profile of theoutput end 302 of the optical fiber is equal to or approximately equal to the size of the slit profile of the receivingend 401 of thespectrometer 40.

In one specific embodiment, as shown in fig. 7(a), the slit profile of the receivingend 401 of thespectrometer 40 is rectangular. As shown in fig. 7(b), the end surface profile of theoutput end 302 of theoptical fiber 30 is made rectangular by arranging a plurality of sub-optical fibers (arranged according to the length-width ratio of the rectangular slit at the receivingend 401 of the spectrometer 40), and the end surface profile of the output end of the optical fiber (i.e. the rectangular cross-sectional profile 303' formed by arranging a plurality of sub-optical fibers) and the cross-sectional profile of the optical fiber housing are as shown in fig. 8. It can be seen that, because the end face profile of theoutput end 302 of the optical fiber matches with the slit profile of the receivingend 401 of thespectrometer 40, the light spot formed by the target light emitted from theoutput end 302 of theoptical fiber 30 is rectangular, and the size of the light spot is equal to or approximately equal to the size of the slit profile of the receivingend 401 of thespectrometer 40, therefore, the target light emitted from theoptical fiber 30 can fall within the slit profile range of the receivingend 401 of thespectrometer 40, so that thespectrometer 40 can receive most or even all of the target light, so as to further improve the light intensity of the target light received by the spectrometer, and maximize the capability of thespectrometer 40 to collect the target light. Therefore, it is easy to find that the light receiving capacity of the spectrometer can be effectively improved through the colorimeter provided by the embodiment of the invention, so that the measurement efficiency of the colorimeter is effectively improved.

It will be appreciated that the end face interface of theoutput end 302 of theoptical fiber 30 is typically connected to the receivingend 401 of thespectrometer 40 using an SMA905 or FC interface. For example, the end face interface of theoutput end 302 of theoptical fiber 30 is connected to the receivingend 401 of thespectrometer 40 by using an FC interface. As shown in fig. 9, the male end of the FC port, which is clamped to the fiber optic monoblock housing, has aboss 305. Fig. 10 is a schematic structural view of a female head of an FC interface having apositioning notch 403 therein for catching theboss 305. The female head of the FC interface in fig. 10 is connected to the receivingend 401 of thespectrometer 40, so that the male head of the FC interface and the female head of the FC interface are positioned by clamping theprotrusion 305 of the male head of the FC interface in thepositioning notch 403 of the female head of the FC interface, and the male head of the FC interface and the female head of the FC interface are positioned and then screwed, so that the purpose of positioning is achieved before theoptical fiber 30 is connected with thespectrometer 40.

However, the end profile of theoutput end 302 of theoptical fiber 30 may be non-rotationally symmetric due to the rectangular profile of the end profile of theoutput end 302 of theoptical fiber 30, as the plurality of sub-fibers are rearranged to match the slit profile (e.g., rectangular profile) of the receivingend 401 of thespectrometer 40. Although the positioning function can be achieved through the FC interface, the end face profile of theoutput end 302 of theoptical fiber 30 may be slightly different from the slit profile of the receivingend 401 of thespectrometer 40 due to the precision of the processing, as shown in fig. 11. Thus, an error may be caused in the measured wavelength of the target light to cause the measured brightness and color coordinates to deviate from the true values, as shown in fig. 12, a curve d is a standard gaussian distribution curve corresponding to the matching of the end profile of theoutput end 302 of theoptical fiber 30 and the slit profile of the receivingend 401 of thespectrometer 40, wherein the abscissa corresponding to the peak value is the relative wavelength value; the curve c is a gaussian distribution curve corresponding to the case where the end surface profile of theoutput end 302 of theoptical fiber 30 is not matched with the slit profile of the receivingend 401 of thespectrometer 40, and the abscissa corresponding to the peak value by gaussian fitting is the relative wavelength value in this state. The difference Δ λ between the peaks of the curve c and the curve d is the wavelength deviation. The abscissa is the number of pixels on the spectrometer (the number of pixels is in a one-to-one correspondence with wavelength), and the ordinate is the light intensity of the light.

In order to reduce the wavelength deviation Δ λ, an embodiment of the present invention further provides acolorimeter correction system 200, which is applied to thecolorimeter 100 according to any of the above embodiments, as shown in fig. 13, where thecorrection system 200 includes: an obtainingunit 202 for obtaining a preset wavelength value corresponding to a characteristic peak of the light emitted by the auxiliarylight source 201 and for obtaining spectral data of thespectrometer 40; thedata processing unit 203 determines a wavelength value corresponding to each characteristic peak according to the spectral data, and determines a wavelength fitting correction value according to a preset wavelength value and the wavelength value corresponding to each characteristic peak; thespectrometer 40 receives the wavelength fit correction value to correct the target measurement value according to the wavelength fit correction value. Thecolorimeter correction system 200 may further include: acollimator 204 for receiving the light emitted from the auxiliarylight source 201 through thecollimator 204 and emitting the collimated light to thedodging sheet 205; and alight homogenizing sheet 205, which converts the collimated light emitted by thecollimating lens 204 into uniform light through thelight homogenizing sheet 205 to obtain the target light.

Specifically, when thecolorimeter correction system 200 is used, the auxiliarylight source 201 is first turned on to be preheated for a preset time (e.g., 10 minutes, 20 minutes, 30 minutes, etc.). Then, the light entrance of thecolorimeter 100 is closely attached to thelight uniformizing sheet 205, and the spectrum data of thespectrometer 40 is acquired by theacquisition unit 202, so that the spectrum data of thespectrometer 40 is transmitted to thedata processing unit 203. Thedata processing unit 203 determines a wavelength value corresponding to each characteristic peak (for example, a full width at half maximum of each characteristic peak) according to the spectral data, and determines a wavelength fitting correction value (a wavelength fitting correction value may be obtained by performing polynomial fitting on the preset wavelength value and the wavelength value corresponding to each characteristic peak) according to the preset wavelength value and the wavelength value corresponding to each characteristic peak, so as to write the wavelength fitting correction value into thespectrometer 40, so as to reduce the wavelength deviation value. Referring to fig. 14 and 15, the corrected wavelength deviation value is greatly reduced after the wavelength of the target light measured by the colorimeter is corrected by thecolorimeter correction system 200 according to the embodiment of the present invention, compared with the wavelength deviation value before the correction. In this way, thespectrometer 40 corrects the target measurement value of thecolorimeter 100 based on the wavelength fitting correction value obtained by thecolorimeter correction system 200, thereby improving the accuracy of the luminance and color coordinates measured by thecolorimeter 100.

In addition, thecolorimeter 100 described in any of the above is generally a spectral colorimeter, so as to improve the light receiving capability of the spectral colorimeter, thereby improving the measurement efficiency thereof.

The embodiment of the invention provides a colorimeter matching method, which is described with reference to fig. 1 and 16, and comprises the following steps:

step 1602, obtain the clear core diameter d of theinput end 301 of theoptical fiber 30, determine the field angle β of the input end of the optical fiber based on the clear core diameter d of the input end of the optical fiber, and determine the field angle α of thelens 20 based on the field angle β of the input end of the optical fiber.

Referring to fig. 17, determining the opening angle β of the input end of the optical fiber based on the pass core diameter d of the input end of the optical fiber includes:

step 1702, obtain the clear aperture D of thelens 20 and the numerical aperture NA of the optical fiber.

Step 1704, determine a focal length of the lens based on the clear aperture and the numerical aperture

Where θ is arcsin (na), θ is the aperture angle of the input end of the optical fiber.

Step 1706, determining an opening angle of the optical fiber input end based on the pass optical core diameter and the focal length of the optical fiber input end

Where α is β/2, α is the angle of view of the lens, and d is the pass-through core diameter of the input end of the fiber.

And 1604, controlling the target light emitted by the region to be measured 10 to enter thelens 20 at the field angle α and then enter theinput end 301 of theoptical fiber 30 at the field angle β, so that the target light is emitted from theoutput end 302 of theoptical fiber 30.

It will be appreciated that the spot of the target light that is converged by thelens 20 onto theinput end 301 of theoptical fiber 30 is shown in figure 3. In the embodiment of the present invention, simulation is performed by using Zemax software based on the size of the optical fiber 30 (generally, 1mm) of the optical core diameter d, so that the diameter of the formed circular light spot is not greater than 1mm, so as to obtain the corresponding end surface position of theinput end 301 of theoptical fiber 30. In this way, the target light emitted from thelens 20 can be converged within the end surface profile of theinput end 301 of theoptical fiber 30, so as to increase the light quantity of the target light received by theinput end 301 of theoptical fiber 30. Meanwhile, the slit width of the receivingend 401 of thespectrometer 40 is enlarged, so that the light spot formed by the target light emitted from theoutput end 302 of theoptical fiber 30 can fall within the slit outline range of the receivingend 401 of thespectrometer 40, thereby increasing the amount of the target light received by thespectrometer 40. Therefore, the light receiving capacity of the colorimeter is greatly improved.

And step 1606, controlling the target light emitted from theoutput end 302 of theoptical fiber 30 to enter thespectrometer 40.

The colorimeter matching method of the embodiment of the invention determines the field angle β of the input end of the optical fiber through the through optical core diameter d of the input end of the optical fiber, determines the field angle α of the lens according to the field angle β of the input end of the optical fiber, and enables the size of a light spot of a target light ray which enters the input end of the optical fiber through the field angle β after entering the lens through the field angle α to be within the profile range of the input end of the optical fiber with the through optical core diameter d, so that the input end of the optical fiber can receive all the target light rays, and the light intensity of the light ray which enters the spectrometer through the output end of the optical fiber is improved.

In one specific embodiment, as shown in fig. 7(a), the slit profile of the receivingend 401 of thespectrometer 40 is rectangular. As shown in fig. 7(b), the end surface profile of theoutput end 302 of theoptical fiber 30 is made rectangular in shape with a plurality of sub-fibers arranged (arranged according to the ratio of the length to the width of the rectangular slit at the receivingend 401 of the spectrometer 40). It can be seen that, because the end face profile of theoutput end 302 of the optical fiber matches with the slit profile of the receivingend 401 of thespectrometer 40, the light spot formed by the target light emitted from theoutput end 302 of theoptical fiber 30 is rectangular, and the size of the light spot is equal to or approximately equal to the size of the slit profile of the receivingend 401 of thespectrometer 40, therefore, the target light emitted from theoptical fiber 30 can fall within the slit profile range of the receivingend 401 of thespectrometer 40, so that thespectrometer 40 can receive most or even all of the target light, so as to further improve the light intensity of the target light received by the spectrometer, and maximize the capability of thespectrometer 40 to collect the target light. Therefore, it is easy to find that the light receiving capacity of the spectrometer can be effectively improved through the colorimeter provided by the embodiment of the invention, so that the measurement efficiency of the colorimeter is effectively improved.

The end profile of theoutput end 302 of theoptical fiber 30 may be non-rotationally symmetric due to the rectangular profile of the end profile of theoutput end 302 of theoptical fiber 30, as the plurality of sub-fibers are rearranged to match the slit profile (e.g., rectangular profile) of the receivingend 401 of thespectrometer 40. Although the positioning function can be achieved through the SMA905 or FC interface, the end face profile of theoutput end 302 of theoptical fiber 30 may be slightly different from the slit profile of the receivingend 401 of thespectrometer 40 due to the precision of the processing, as shown in fig. 11. This may result in errors in the measured wavelength of the target light, causing the measured brightness and color coordinates to deviate from the true values.

It should be noted that, in the colorimeter matching method disclosed in the embodiment of the present invention, please refer to the colorimeter embodiment for the same technical solutions as those in the colorimeter, and details thereof are not repeated herein.

In order to reduce the wavelength deviation Δ λ, an embodiment of the present invention further provides a colorimeter correction method, which is applied to the colorimeter matching method according to any one of the embodiments, and as shown in fig. 18, the colorimeter correction method includes:

and 1801, starting the auxiliary light source to preheat the auxiliary light source within a preset time.

And step 1802, acquiring a preset wavelength value corresponding to a characteristic peak of the light emitted by the auxiliary light source.

And 1803, acquiring spectral data of the spectrometer to determine a wavelength value corresponding to each characteristic peak based on the spectral data.

And 1804, determining a wavelength fitting correction value based on the preset wavelength value and the wavelength value corresponding to each characteristic peak, and correcting the target measurement value of the spectrometer based on the wavelength fitting correction value.

As described with reference to fig. 13, the colorimeter calibration method according to the embodiment of the invention first turns on the auxiliarylight source 201, so that the auxiliarylight source 201 is preheated within a preset time (e.g., 10 minutes, 20 minutes, 30 minutes, etc.). Then, the light entrance of thecolorimeter 100 is closely attached to thelight uniformizing sheet 205, and the spectrum data of thespectrometer 40 is acquired by theacquisition unit 202, so that the spectrum data of thespectrometer 40 is transmitted to thedata processing unit 203. Thedata processing unit 203 determines a wavelength value corresponding to each characteristic peak (for example, a full width at half maximum of each characteristic peak) according to the spectral data, and determines a wavelength fitting correction value (a wavelength fitting correction value may be obtained by performing polynomial fitting on the preset wavelength value and the wavelength value corresponding to each characteristic peak) according to the preset wavelength value and the wavelength value corresponding to each characteristic peak, so as to write the wavelength fitting correction value into thespectrometer 40, so as to reduce the wavelength deviation value. Referring to fig. 14 and 15, the corrected wavelength deviation value is greatly reduced after the wavelength of the target light measured by the colorimeter is corrected by thecolorimeter correction system 200 according to the embodiment of the present invention, compared with the wavelength deviation value before the correction. In this way, thespectrometer 40 corrects the target measurement value of thecolorimeter 100 based on the wavelength fitting correction value obtained by thecolorimeter correction system 200, thereby improving the accuracy of the luminance and color coordinates measured by thecolorimeter 100.

It should be noted that, in the colorimeter correction method disclosed in the embodiments of the present invention, please refer to the embodiments of the colorimeter correction system for the same technical solutions as those in the colorimeter correction system, and details thereof are not repeated herein.

Preferably, an embodiment of the present invention further provides a terminal device, which may include a processor, a memory, and a computer program stored in the memory and capable of running on the processor, where the computer program, when executed by the processor, implements the processes of the method embodiments shown in fig. 16 to 18, and can achieve the same technical effects, and details are not described here to avoid repetition. The processor can be an ASIC, an FPGA, a CPU, an MCU or other physical hardware or virtual equipment with an instruction processing function; the memory is selected from RAM, DRAM, FeRAM, NVDIMM, SSD, RAID 0-7 or data center.

An embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements the processes of the methods shown in fig. 12 to 14, and can achieve the same technical effects, and in order to avoid repetition, details are not repeated here. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.

The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (10)

1. A colorimeter matching method, the method comprising:

acquiring the through optical core diameter of an optical fiber input end, determining an opening angle of the optical fiber input end based on the through optical core diameter of the optical fiber input end and determining a field angle of a lens based on the opening angle of the optical fiber input end;

controlling target light rays emitted by a region to be detected to enter the lens at the field angle and then enter the input end of the optical fiber at the field angle so as to enable the target light rays to be emitted from the output end of the optical fiber;

and controlling the target light emitted from the output end of the optical fiber to enter a spectrometer, wherein the end face profile of the output end of the optical fiber is matched with the slit profile of the receiving end of the spectrometer.

2. The method of claim 1, wherein determining an opening angle of the input end of the optical fiber based on a clear core diameter of the input end of the optical fiber comprises:

acquiring the clear aperture of the lens and the numerical aperture of the optical fiber;

determining a focal length of a lens based on the clear aperture and the numerical aperture

θ is an aperture angle of the input end of the optical fiber, NA is a numerical aperture of the optical fiber, and D is a clear aperture of the lens;

determining an opening angle of the optical fiber input end based on a pass optical core diameter of the optical fiber input end and the focal length

Wherein α is β/2, α is the angle of view of the lens, and d is the pass optical core diameter of the input end of the optical fiber.

3. The method of claim 1,

the slit outline of the receiving end of the spectrometer is rectangular;

the end surface profile of the output end of the optical fiber is rectangular formed by arranging a plurality of sub optical fibers.

4. A colorimeter correction method applied to the method according to any one of claims 1 to 3, characterized in that the correction method comprises:

acquiring a preset wavelength value corresponding to a characteristic peak of light emitted by an auxiliary light source;

acquiring spectral data of the spectrometer to determine a wavelength value corresponding to each characteristic peak based on the spectral data;

and determining a wavelength fitting correction value based on the preset wavelength value and the wavelength value corresponding to each characteristic peak, so as to correct the target measurement value of the spectrometer based on the wavelength fitting correction value.

5. The method according to claim 4, before obtaining the preset wavelength value corresponding to the characteristic peak of the auxiliary light source, comprising:

and starting the auxiliary light source to preheat the auxiliary light source within a preset time.

6. A colorimeter comprising:

the lens is used for receiving target light rays emitted by a region to be measured, wherein the target light rays are incident to the lens at the angle of field of the lens;

an optical fiber for receiving a target ray emitted by the lens, wherein the target ray is incident on the input end of the optical fiber at an opening angle of the input end of the optical fiber, the opening angle is determined based on a clear core diameter of the input end of the optical fiber, and the field angle is determined based on the opening angle; and

a spectrometer for receiving the target light emitted from the output end of the optical fiber;

and the end face contour of the output end of the optical fiber is matched with the slit contour of the receiving end of the spectrometer.

7. The colorimeter according to claim 6,

opening angle of the input end of the optical fiber

The field angle α of the lens is β/2;

wherein d is the through optical core diameter of the optical fiber input end, f is the focal length of the lens, and

d is the clear aperture of the lens, and theta is the fiber inputAnd θ ═ arcsin (NA), the numerical aperture of the fiber.

8. The colorimeter according to claim 6,

the slit outline of the receiving end of the spectrometer is rectangular;

the end surface profile of the output end of the optical fiber is rectangular formed by arranging a plurality of sub optical fibers.

9. A colorimeter calibration system applied to the colorimeter according to any one of claims 6 to 8, wherein the calibration system comprises:

the acquisition unit is used for acquiring a preset wavelength value corresponding to a characteristic peak of light emitted by the auxiliary light source and acquiring spectral data of the spectrometer;

the data processing unit is used for determining a wavelength value corresponding to each characteristic peak according to the spectral data and determining a wavelength fitting correction value according to the preset wavelength value and the wavelength value corresponding to each characteristic peak;

and the spectrometer receives the wavelength fitting correction value to correct the target measurement value according to the wavelength fitting correction value.

10. The correction system of claim 9, further comprising:

the collimating lens is used for receiving the light rays emitted by the auxiliary light source and emitting collimated light rays to the dodging sheet; and

and the light homogenizing sheet is used for converting the collimated light rays emitted by the collimating lens into uniform light rays so as to obtain the target light rays.

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