Device, method and equipment for multi-point calibration of color rendering index measuring instrument, medium and product

Abstract

The invention discloses a device, method and equipment for multi-point calibration of a color rendering index measuring instrument, a medium and a product, and relates to the field of light source calibration processing. The device comprises a color rendering index adjustable light source, a spectrograph, a processor and a color rendering index measuring instrument. Wherein the processor is connected with the spectrograph and the color rendering index adjustable light source. The color rendering index measuring instrument measures the color rendering index of the calibrated color rendering index adjustable light source, and then calibration of the indicating value of the color rendering index measuring instrument is completed. And the processor determines the color rendering index by taking the relative spectral power distribution of the reference light source as basic data and combining spectral brightness coefficients of 15 standard color samples specified by CIE according to the relative spectral power distribution measured by the spectrograph. According to the invention, the color rendering index multi-point standard value coverage can be realized, the calibration range can be expanded, the inspection on the measurement performance of the color rendering index of the instrument can be realized, and meanwhile, the color rendering index parameters can be subjected to effective quantity value traceability, so that a traditional standard lamp can be replaced, and the quantity value transmission of the color rendering index can be carried out.

Description

Technical Field

[0001] This application relates to the field of light source calibration processing, and particularly to a device, method, equipment, medium and product for multi-point calibration of a color rendering index measuring instrument. Background Art

[0002] With people's continuous pursuit of more comfortable and healthy lighting, the color rendering property of light sources has received increasing attention. The Color Rendering Index (CRI) is used to describe the color rendering property of a light source, that is, the ability of the light source to fully display the color of the illuminated object when irradiating the object, and it is a necessary parameter for currently commercially available lighting sources, especially LED light sources. The color rendering index is a parameter for quantitatively evaluating the color rendering property of a light source based on the total color shift of the test color sample under the illumination of the reference light source and the measured light source. It is divided into the special color rendering index and the general color rendering index, and is the result calculated from the relative spectral power distribution of the light source, the relative spectral power distribution of the reference light source, and the spectral luminance coefficients of 15 standard color samples specified by the Commission Internationale de l'Eclairage (CIE).

[0003] The higher the color rendering index of a light source, the stronger the ability to distinguish colors, and the more comfortable the human eye feels. If living under a light source with a low color rendering index for a long time, it will cause irreversible effects on our physical and mental health. Relevant research shows that too low color rendering index of illumination affects the human eye's recognition of object colors, and the sensitivity of the human eye's cone cells will also decrease. If this situation continues, it will lead to a decline and deterioration of color discrimination ability, causing serious vision problems and eye diseases such as color blindness and color weakness. When staying under a light source with very poor color rendering for a long time, the brain will involuntarily concentrate more when distinguishing things, which is likely to cause eye fatigue. A series of animal experiments show that light sources with a low color rendering index are more likely to cause a reduction in retinal photoreceptor cells, a decrease in retinal thickness, and an increase in refractive power, thus causing myopia. Looking at objects with color differences for a long time is also likely to make people feel depressed, leading to diseases such as depression.

[0004] The impact of color rendering index is also reflected in traffic safety. It is directly related to the visual perception and reaction speed of road users, especially drivers, and thus plays a key role in preventing traffic accidents. Studies have shown that in environments with poor lighting conditions such as tunnels or at night, lighting with a low color rendering index may distort the color of obstacles and increase the difficulty of identification. Light sources with a high color rendering index can ensure that obstacles are brightly colored, allowing drivers to discover and identify them at the first time, and then take countermeasures such as avoidance or deceleration in advance, effectively shortening reaction time and avoiding potential collision risks. From a psychological point of view, lighting with a high color rendering index can also improve the comfort and alertness of drivers. Under warm and natural light, drivers' visual fatigue will be relatively reduced, and their mood will be more relaxed and pleasant, which will help them maintain better attention and judgment and reduce traffic accidents caused by distracted or fatigued driving.

[0005] Various jewelry, jade, cotton, etc. need to be graded based on color, and this also needs to be done under a high color rendering light source, otherwise it will affect trade fairness and even lead to legal disputes.

[0006] Based on the importance of light source color rendering, as the country and the people pay more attention to light source color rendering, the demand for color rendering index measurement has led to the emergence of a variety of measuring instruments on the market. Electric light source manufacturers conduct quality control, testing agencies conduct on-site lighting testing, and market supervision departments enforce the law, all of which rely on the measurement of color rendering index measuring instruments. However, in actual tests, it was found that the measurement results of different instruments vary greatly, which may lead to errors in judgment, judging that products or lighting environments that do not meet the standards are up to standard, or judging that products that meet the standards are not up to standard, causing health losses or arbitration disputes. Based on this, it is necessary to establish corresponding calibration specifications for color rendering index measuring instruments and trace their effective values ​​to avoid such situations.

[0007] There is no specific calibration specification for color rendering index measuring instruments at present. However, based on the relevant requirements for color rendering index calibration, it can be seen that due to the lack of standard light sources that can provide different color rendering index values, the standard light source A with a color rendering index of 100 can only be used as the standard value. This cannot cover actual usage and cannot truly examine the performance of the instrument. Even after calibration at 100 single points, the measurement results in actual use are still quite different and cannot meet the actual calibration needs.

[0008] In summary, if the color rendering index does not meet the standard, it may cause serious consequences such as affecting visual health, traffic safety, and trade fairness. However, there are large differences in the measurement results of color rendering index measuring instruments on the market. There is a lack of calibration specifications for the color rendering index, and the actual value range cannot be traced. Therefore, it is urgent to conduct in-depth research on the effective value traceability method of this parameter and the device for multi-point calibration, so as to protect people's lives and health, trade fairness, etc. Summary of the Invention

[0009] The purpose of the present application is to provide a device, method, equipment, medium and product for multi-point calibration of a color rendering index measuring instrument, which can achieve coverage of multi-point standard values of the color rendering index, expand the calibration range, realize the investigation of the color rendering index measurement performance of the instrument, and at the same time enable the effective traceability of the color rendering index parameters, and then can replace the traditional standard lamp to carry out the value transfer of the color rendering index.

[0010] To achieve the above purpose, the present application provides the following solutions:

[0011] In the first aspect, the present application provides a device for multi-point calibration of a color rendering index measuring instrument, including:

[0012] A color rendering index adjustable light source, including a power supply module, which is used as the light source to be measured;

[0013] A spectrometer, which is used to measure the relative spectral power distribution of the light source to be measured; the spectrometer is a calibrated spectrometer;

[0014] A processor, which is connected to the spectrometer and the power supply module, and is used to determine the relative spectral power distribution of the reference light source based on the relative spectral power distribution measured by the spectrometer, determine the chromaticity difference between the light source to be measured and the reference light source based on the relative spectral power distribution and the relative spectral power distribution of the reference light source, and when the chromaticity difference meets the set requirements, according to the relative spectral power distribution of the light source to be measured and the relative spectral power distribution of the reference light source, combined with the spectral luminance coefficients of 15 standard color samples specified by the CIE, obtain the color rendering index of the light source to be measured according to the color rendering index calculation principle; the processor is also used to control the power supply parameters of the light source to be measured to modify the color rendering index of the light source to be measured;

[0015] A color rendering index measuring instrument, which is used to measure the color rendering index of the calibrated color rendering index adjustable light source; complete the calibration of the indication value of the color rendering index measuring instrument based on the determined color rendering index and the measured color rendering index of the calibrated color rendering index adjustable light source.

[0016] Optionally, the device for multi-point calibration of the color rendering index measuring instrument further includes:

[0017] A DC regulated power supply, which is connected to the color rendering index adjustable light source and the processor, and is used to output current and voltage values under the control of the processor to control the color rendering index adjustable light source to continuously light for a set time.

[0018] Optionally, the wavelength range of the spectral luminous power distribution of the color rendering index adjustable light source is between 380nm and 780nm; the color rendering index adjustment range of the color rendering index adjustable light source is at least 60-100.

[0019] Optionally, the color rendering index adjustable light source includes: an integrating sphere, a light source, and a baffle;

[0020] The integrating sphere is provided with a light outlet and a light inlet; the light source is arranged at the light inlet; the baffles are all arranged in the integrating sphere, and the baffles are located between the light source and the light outlet;

[0021] The light source is electrically connected to the DC regulated power supply.

[0022] Optionally, the light source includes multiple light-emitting diodes with different operating parameters; different spectra are simulated by multiple light-emitting diodes with different operating parameters; the operating parameters include central wavelength, narrowband, and broadband.

[0023] In a second aspect, the present application provides a method for multi-point calibration of a color rendering index measuring instrument, including:

[0024] Obtaining the relative spectral power distribution of the color rendering index adjustable light source to be measured by a calibrated spectrometer;

[0025] Obtaining the correlated color temperature of the color rendering index adjustable light source to be measured based on the relative spectral power distribution of the color rendering index adjustable light source to be measured, and determining the relative spectral power distribution of the reference light source according to the correlated color temperature;

[0026] Determining the chromaticity difference between the color rendering index adjustable light source to be measured and the reference light source from the relative spectral power distributions of the color rendering index adjustable light source to be measured and the reference light source;

[0027] Under the condition that the chromaticity difference meets the set requirements, according to the relative spectral power distribution of the light source to be measured and the relative spectral power distribution of the reference light source, combined with the spectral luminance coefficients of 15 standard color samples specified by the CIE, the color rendering index of the color rendering index adjustable light source to be measured is obtained according to the color rendering index calculation principle;

[0028] Completing the calibration of the indication value of the color rendering index measuring instrument based on the obtained color rendering index and the color rendering index of the calibrated color rendering index adjustable light source measured by the color rendering index measuring instrument.

[0029] Optionally, before the relative spectral power distribution of the color rendering index adjustable light source to be measured, it further includes:

[0030] Controlling the optical power of multiple light-emitting diodes in the color rendering index adjustable light source to achieve different spectral combinations;

[0031] The spectrometer measures different spectral combinations, obtains the relative spectral power distribution, and through a processor, obtains the color rendering index value corresponding to the current relative spectral power distribution, and stores the current value of the power supply module and the corresponding color rendering index in a database.

[0032] In a third aspect, the present application provides a computer device, including: a memory, a processor, and a computer program stored on the memory and executable on the processor, where the processor executes the computer program to implement the steps of the method for multi-point calibration of a color rendering index measuring instrument described in any one of the above.

[0033] In a fourth aspect, the present application provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, it implements the steps of the method for multi-point calibration of a color rendering index measuring instrument described in any one of the above.

[0034] In a fifth aspect, the present application provides a computer program product, including a computer program, and when the computer program is executed by a processor, it implements the steps of the method for multi-point calibration of a color rendering index measuring instrument described in any one of the above.

[0035] According to the specific embodiments provided by the present application, the present application has the following technical effects:

[0036] The present application provides a device, method, equipment, medium and product for multi-point calibration of a color rendering index measuring instrument. After measuring the relative spectral power distribution of the light source to be measured by a spectrometer, the calibrated color rendering index value is obtained through the processing of the processor, realizing the coverage of multi-point standard values of the color rendering index for the first time, expanding the calibration range, and enabling the investigation of the color rendering index measurement performance of the color rendering index measuring instrument. By determining the color rendering index, the effective value traceability of the color rendering index parameters can be achieved. Moreover, based on the structure of this device, it can completely replace the traditional standard lamp for value transfer of the color rendering index. Description of the Drawings

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0038] Figure 1 It is a schematic structural diagram of a device for multi-point calibration of a color rendering index measuring instrument provided by an embodiment of the present application;

[0039] Figure 2 It is a schematic structural diagram of a color rendering index adjustable light source provided by an embodiment of the present application;

[0040] Figure 3 It is a spectral example diagram of multiple LEDs provided by an embodiment of the present application;

[0041] Figure 4Schematic flowchart of a method for multi-point calibration of a color rendering index measuring instrument provided by an embodiment of the present application;

[0042] Figure 5 Schematic structural diagram of a computer device provided by an embodiment of the present application.

[0043] Explanation of reference numerals:

[0044] 1 - DC regulated power supply, 2 - Color rendering index adjustable light source, 21 - Light output port, 22 - Baffle, 23 - Power supply and control module, 24 - Light source, 25 - Integrating sphere, 3 - Spectrometer, 4 - Color rendering index measuring instrument, 5 - Processor. Detailed implementation manners

[0045] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0046] To make the above objects, features, and advantages of the present application more obvious and understandable, the present application will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0047] In an exemplary embodiment, as Figure 1 shown, a device for multi-point calibration of a color rendering index measuring instrument is provided, including: a DC regulated power supply 1 for lighting the color rendering index adjustable light source 2, a spectrometer 3 for measuring the relative spectral power distribution of the color rendering index adjustable light source 2 and calibrated or verified, a processor 5 for controlling the output current and voltage of the DC regulated power supply 1, receiving the relative spectral power distribution data of the spectrometer 3, and calculating and displaying the color rendering index in real time, and a color rendering index measuring instrument 4 to be calibrated.

[0048] The color rendering index adjustable light source 2 is electrically connected to the DC regulated power supply 1, the color rendering index adjustable light source 2 is spatially optically connected to the input end of the spectrometer 3, the color rendering index adjustable light source 2 is spatially optically connected to the color rendering index measuring instrument 4, and the processor 5 is respectively network-connected to the DC regulated power supply 1 and the spectrometer 3. Among them, the processor 5 adopted in the present application can be a computer, which is used to control the DC regulated power supply 1 to light the color rendering index adjustable light source 2 to output a specified color rendering index value, and at the same time obtain the relative spectral power distribution of the light source from the spectrometer 3 to calculate and display the color rendering index value of the current light source in real time.

[0049] For example, the wavelength range of the spectral power distribution of the color rendering index adjustable light source 2 can be continuously distributed between 380 nm and 780 nm, and the color rendering index adjustment range is at least (or wider than) 60 to 100. As long as the color rendering index adjustable light source that meets this condition is applicable to the device provided in this application.

[0050] The spectrometer 3 required to measure the relative spectral power distribution of the light source must be calibrated before it can be used. In the present invention, the calibrated spectrometer is used to directly measure the relative spectral power distribution of the light source, and the color rendering index value is calculated according to the requirements of the standard GB / T 5702-2019 "Method for Evaluating the Color Rendering Property of Light Sources", so that the parameter of the color rendering index has a complete traceability chain. Among them, the spectral data of the color rendering index adjustable light source 2 is measured by the traced spectrometer. GB / T 5702-2019 "Method for Evaluating the Color Rendering Property of Light Sources" clearly stipulates the method for obtaining the color rendering index from spectral data. Based on this, the color rendering index obtained by this device is traceable.

[0051] A color rendering index calculation program and a color rendering index adjustable light source control program are implanted in the processor 5. The color rendering index calculation program is used to calculate and display the current color rendering index value of the color rendering index adjustable light source 2 in real time, and the color rendering index adjustable light source control program is used to precisely control and modify the output current and voltage values of the DC regulated power supply 1 used to light the color rendering index adjustable light source 2.

[0052] In an embodiment provided in this application, as Figure 2 shown in the color rendering index adjustable light source 2, its structure can be divided into an integrating sphere module (i.e., the integrating sphere 25), an internal light source module (i.e., the light source 24), and a power supply and control module 23.

[0053] Among them, the integrating sphere 25 is provided with a light outlet 21 and a light inlet. The light source 24 irradiates into the integrating sphere through the light inlet of the integrating sphere 25. A baffle 22 is arranged in front of the light source 24 to prevent its direct light from reaching the light outlet 21 of the integrating sphere 25. The light emitted by the light source 24 is mixed by multiple reflections on the inner wall of the integrating sphere 25 and a uniform light output is obtained at the light outlet 21 of the integrating sphere.

[0054] In another exemplary embodiment provided in this application, the way to achieve adjustable color rendering index is to simulate different spectra by combining multiple light-emitting diodes (LEDs) with different central wavelengths, narrow bands, wide bands, etc., and further calculate the color rendering index. Therefore, the key to the color rendering index adjustable light source 2 is to control the light power of multiple LEDs to achieve different spectral combinations. The specific implementation method is as follows:

[0055] ① Simulate different spectra by combining multiple LEDs with different central wavelengths, narrow bands, wide bands, etc.

[0056] To achieve different spectral types, considering aspects such as light source size and heat generation, multiple LED lamp beads with different central wavelengths, such as narrowband and broadband, are selected and processed into the form of an LED array. The spectral example diagram is as Figure 3 shown. Figure 3 In it, wavelength is the wavelength, and SPD is the abbreviation of Spectral Power Distribution.

[0057] ②Measure the spectral data of each LED under different currents and establish a database.

[0058] Use the DC regulated power supply 1 to light a single LED separately at the entrance of the integrating sphere and make it burn at different currents, measure its spectral data, and establish a database.

[0059] ③Through data fitting, interpolate and calculate the spectrum at any current.

[0060] Through the measured spectral database, through data fitting, the spectral data at any other current can be interpolated and calculated.

[0061] ④Compile a program to calculate the combined spectrum and lamp current corresponding to the target color rendering index value.

[0062] Compile a program to calculate the combined spectrum corresponding to the target color rendering index value and the lamp current required to achieve this spectrum through the spectral data in the database, so as to achieve precise matching of the spectrum.

[0063] In another exemplary embodiment of the present application, in order to achieve traceability of the quantity value, based on the device structure provided above, its working principle can be:

[0064] Step 1: According to the supporting software or user manual of the color rendering index adjustable light source 2, control the DC regulated power supply 1 to output the corresponding current and voltage values. After the color rendering index of the color rendering index adjustable light source 2 reaches the expected value, keep the color rendering index adjustable light source 2 lit for a period of time to ensure the stability of the output of the color rendering index adjustable light source 2.

[0065] Step 2: Use a calibrated spectrometer 3 to measure the relative spectral power distribution of the color rendering index adjustable light source 2, input the spectral result into the color rendering index calculation program (embedded in the processor 3) to calculate and display the color rendering index value of the light source in real time. The color rendering index calculated by the color rendering index calculation program is based on the relative spectral power distribution of the measured light source, the relative spectral power distribution of the reference light source, and the spectral luminance coefficients of 15 standard color samples specified by the CIE, and is calculated according to the requirements of the national standard GB / T5702-2019 "Method for Evaluating the Color Rendering Property of Light Sources". This calculated color rendering index is measured by a calibrated spectrometer and calculated according to the national standard, and can achieve traceability of the quantity value.

[0066] Step 3: Use the color rendering index measuring instrument to directly measure the color rendering index adjustable light source 2 after being calibrated in Step 2, complete the indication calibration of the color rendering index measuring instrument 4, and achieve the transfer of the measured value.

[0067] Step 4: Repeat the above Steps 1 - 3, and modify the color rendering index value of the color rendering index adjustable light source 2, then the multi-point calibration of the color rendering index measuring instrument 4 can be achieved.

[0068] In another exemplary embodiment of the present application, the calculation process of the color rendering index can be described as follows:

[0069] (1) Use the spectroscope 3 that has been verified and calibrated to measure the spectral power distribution of the light source to be measured.

[0070] a) Process the obtained spectral data to obtain the spectral tristimulus values of the light source to be measured. Among them, the spectral tristimulus values (X, Y, Z) of the light source are expressed as:

[0071]

[0072] In the formula, s(λ) represents the (relative) spectral power distribution of the light source, Δλ represents the wavelength test interval of the (relative) spectral power distribution of the light source, k represents the normalization coefficient, λ min represents the minimum wavelength of the (relative) spectral power distribution of the light source, λ max represents the maximum wavelength of the (relative) spectral power distribution of the light source, and respectively represent the CIE 1931 standard colorimetric observer matching functions (2° viewing angle), and specific details can be found in Appendix of GB / T5702 - 2019 "Method for Evaluating the Color Rendering Property of Light Sources".

[0073] b) Calculate the chromaticity coordinates (x, y) and chromaticity coordinates (u, v) based on the spectral tristimulus values of the light source to be measured:

[0074]

[0075] c) Calculate the correlated color temperature of the light source to be measured according to the chromaticity coordinate (u, v) value and the known 61 equal correlated color temperature line data. After saving 4 groups of data in the correlated color temperature line data, they are respectively the reciprocal 1 / T of the correlated color temperature of the light source i and its corresponding chromaticity coordinates u i and v i values and the slope m i at this point on the absolute color temperature curve. The specific calculation method is to use the chromaticity coordinate (u, v) value of the light source to be measured and the known 61 equal correlated color temperature line data to find the two adjacent isothermal lines closest to the point where the chromaticity coordinate (u, v) value of the light source to be measured is located. The calculation formula is as follows:

[0076]

[0077] When the product of two isotherms d 1 and d 2 is just less than or equal to 0, record the data of the two relevant color temperature lines T 1 and T 2 , and the correlated color temperature T cp of the light source under test can be calculated using the following formula (10):

[0078]

[0079] (2) Determine the spectral power distribution of the reference light source.

[0080] a) When the correlated color temperature T cp ≤5000K, the spectral power distribution of the reference light source is S p (λ):

[0081]

[0082] where c 1 represents the first radiation constant, with a value of 3.74183×10 -16 W·m 2 . c 2 represents the second radiation constant, with a value of 1.4388×10 -2 m·K. λ represents the wavelength, with the unit of meter (m). T represents the color temperature, with the unit of Kelvin (K).

[0083] b) When the correlated color temperature T cp >5000K, the spectral power distribution of the reference light source is as follows:

[0084] S d (λ) = S 0 (λ) + M 1 S 1 (λ) + M 2 S 2 (λ) (12)

[0085]

[0086] where (x d , y d ) represents the coordinates of the reference light source, and the values of S 0 , S 1 , S 2 can be found in Appendix C of GB / T 5702-2019 "Method for Evaluating the Color Rendering Properties of Light Sources". Among them, there are:

[0087]

[0088] (3) Calculate the chromaticity difference between the light source under test and the reference light source. When the chromaticity difference between the light source under test and the reference light source is greater than or equal to 5.4×10 -3 , the color rendering index of the light source under test cannot be calculated, and the calculation terminates at this time.

[0089] Among them, the chromaticity difference is denoted as Δc, and its calculation formula is:

[0090]

[0091] In the formula, (u k , v k ) represents the chromaticity coordinates of the light source under test, and (u r , v r ) represents the chromaticity coordinates of the reference light source.

[0092] (4) Calculate the chromaticity parameters.

[0093] Based on the spectral tristimulus values of the light source given in formulas (1) to (4), the spectral tristimulus values (X i , Y i , Z i ) of each color sample can be expressed as:

[0094]

[0095] In the formula, i represents the serial number of the color sample to be evaluated, which is 1 - 15, and ρ(λ i ) represents the visible light spectral reflectance of the color sample, and its specific value can be referred to Appendix B of GB / T 5702 - 2019 "Method for Evaluating Color Rendering of Light Sources".

[0096] Furthermore, the chromaticity coordinates can be calculated based on formulas (7) and (8).

[0097] The result of the chromatic adaptation chromaticity shift correction of the chromaticity coordinates of the color sample under the light source under test can be expressed as:

[0098]

[0099] In the formula, (u k,i , v k,i ) represents the chromaticity coordinates of the chromatic adaptation chromaticity shift correction of the i-th sample under the light source under test. (c r , d r ) represents the chromatic adaptation chromaticity shift correction value of the reference light source, (c k , d k ) represents the chromatic adaptation chromaticity shift correction value of the light source under test, (c k,i , d k,i) represents the chromatic adaptation chromaticity shift correction value of the i-th sample under the light source to be measured, which is calculated from the chromaticity coordinates (u, v) of the reference light source according to Equations (21) and (22). Wherein:

[0100]

[0101] In the formula, both c and d represent the chromatic adaptation chromaticity shift correction value.

[0102] The chromaticity parameters W * 、U * and V * of the color sample under the light source irradiation are calculated as follows:

[0103]

[0104] U * =13W * (u - u 0 ) (24)

[0105] V * =13W * (v - v 0 ) (25)

[0106] In the formula, (u 0 , v 0 ) represents the initial chromaticity coordinates of the reference light source.

[0107] (5) Calculate the color rendering index.

[0108] The calculation formula for the color difference of the color sample under the irradiation of the light source to be measured and the reference light source respectively is:

[0109]

[0110] In the formula, ΔE represents the color difference of the color sample, and represent the chromaticity parameters of the i-th sample under the irradiation of the reference light source, and represent the chromaticity parameters of the i-th sample under the irradiation of the light source to be measured.

[0111] The special color rendering index R i corresponding to each color sample is calculated according to the following formula (27). Wherein:

[0112] R i =100 - 4.6ΔE i (27)

[0113] In the formula, ΔE i represents the color difference of the i-th sample.

[0114] Therefore, the general color rendering index Ra is as follows:

[0115]

[0116] In summary, in this application, first, according to the supporting software or usage instructions of the color rendering index adjustable light source 2, the DC regulated power supply 1 is controlled to output the corresponding current and voltage values, so that the color rendering index of the color rendering index adjustable light source 2 reaches the expected value. The color rendering index adjustable light source 2 is continuously lit for a period of time, and then the spectrum of the color rendering index adjustable light source 2 at this time is measured by the calibrated spectrometer 3. The spectrum result is input into the processor 3 (which can be a computer) to obtain the color rendering index value. At this time, the color rendering index of the color rendering index adjustable light source 2 is calibrated, and the quantity value transfer and traceability can be realized. Finally, the color rendering index measuring instrument 4 is calibrated by using the calibrated color rendering index adjustable light source 2. By repeating the above process to modify the color rendering index of the color rendering index adjustable light source 2, multi-point calibration of the color rendering index measuring instrument 4 can be realized. Compared with the known color rendering index calibration method that can only calibrate the point with a color rendering index of 100 using a standard lamp, the solution provided in this application can realize multi-point calibration of the color rendering index value only by using one light source, saving costs while expanding the calibration range of the color rendering index, and being able to realize multi-point quantity value transfer and traceability of the color rendering index.

[0117] Based on the same inventive concept, the embodiment of this application also provides a method for multi-point calibration of a color rendering index measuring instrument applied to the device for multi-point calibration of a color rendering index measuring instrument involved above. The implementation solution provided by this method to solve the problem is similar to the implementation solution recorded in the above device. Therefore, the specific limitations in one or more method embodiments for multi-point calibration of a color rendering index measuring instrument provided below can refer to the limitations on the device for multi-point calibration of a color rendering index measuring instrument in the above text, and will not be repeated here.

[0118] In an exemplary embodiment, as Figure 4 shown, a method for multi-point calibration of a color rendering index measuring instrument is provided, including:

[0119] Step 400: Obtain the relative spectral power distribution of the measured color rendering index adjustable light source from the calibrated spectrometer.

[0120] Step 401: Obtain the correlated color temperature of the measured color rendering index adjustable light source based on the relative spectral power distribution of the measured color rendering index adjustable light source, and determine the relative spectral power distribution of the reference light source according to the correlated color temperature.

[0121] Step 402: Determine the chromaticity difference between the measured color rendering index adjustable light source and the reference light source from the relative spectral power distributions of the measured color rendering index adjustable light source and the reference light source.

[0122] Step 403: Under the condition that the colorimetric difference meets the set requirements (such as national standard requirements), according to the relative spectral power distribution of the light source under test and the relative spectral power distribution of the reference light source, combined with the spectral luminance coefficients of 15 standard color samples specified by CIE, the color rendering index of the adjustable color rendering index light source under test is obtained according to the calculation principle of the color rendering index.

[0123] Step 404: Based on the obtained color rendering index and the calibrated color rendering index of the adjustable color rendering index light source measured by the color rendering index measuring instrument, the calibration of the indication value of the color rendering index measuring instrument is completed.

[0124] As an optional implementation manner, before performing step 400, the method provided in this application further includes the following steps:

[0125] Step 1: Control the optical powers of multiple light-emitting diodes in the adjustable color rendering index light source to achieve different spectral combinations.

[0126] Step 2: The spectrometer measures different spectral combinations to obtain the relative spectral power distribution. After the processor obtains the color rendering index value corresponding to the current relative spectral power distribution, the current value of the power supply module and the corresponding color rendering index are stored in the database, which is convenient for quickly setting the excitation of the light source under test when the device calibrates the established color rendering index value.

[0127] In an exemplary embodiment, a computer device is provided. The computer device can be a server or a terminal, and its internal structure diagram can be as Figure 5 shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, abbreviated as I / O), and a communication interface. Among them, the processor, the memory, and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store data for multi-point calibration of the color rendering index measuring instrument. The input / output interface of the computer device is used to exchange information between the processor and external devices. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, it implements a method for multi-point calibration of a color rendering index measuring instrument.

[0128] Those skilled in the art can understand, Figure 5The structure shown is only a block diagram of some structures related to the solution of this application, and does not constitute a limitation on the computer device to which the solution of this application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different component layout. In an exemplary embodiment, a computer device is provided, including a memory and a processor. A computer program is stored in the memory, and when the processor executes the computer program, the steps in the above method embodiments are implemented.

[0129] In an exemplary embodiment, a computer-readable storage medium is provided, storing a computer program, and when the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0130] In an exemplary embodiment, a computer program product is provided, including a computer program, and when the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0131] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use, and processing of relevant data need to comply with relevant regulations.

[0132] Those of ordinary skill in the art can understand that all or part of the processes of implementing the methods in the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, database, or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memories. Non-volatile memories can include read-only memory (ROM), magnetic tapes, floppy disks, flash memories, optical memories, high-density embedded non-volatile memories, resistive random access memories (ReRAM), magnetoresistive random access memories (MRAM), ferroelectric random access memories (FRAM), phase change memories (PCM), graphene memories, etc. Volatile memories can include random access memory (RAM) or external cache memories, etc. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc.

[0133] The databases involved in the embodiments provided in the present application can include at least one of relational databases and non-relational databases. Non-relational databases can include distributed databases based on blockchain, etc., without limitation. The processors involved in the embodiments provided in the present application can be general-purpose processors, central processors, graphics processors, digital signal processors, programmable logics, data processing logics based on quantum computing, etc., without limitation.

[0134] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0135] Specific examples are used in this article to elaborate on the principles and implementation manners of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those of ordinary skill in the art, according to the idea of the present application, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A device for multi-point calibration of a color rendering index measuring instrument, characterized in that: The device for multi-point calibration of a color rendering index measuring instrument comprises: The display refers to an adjustable light source, including a power module, used as the light source under test; A spectrometer, used to measure the relative spectral power distribution of the light source under test; the spectrometer is a calibrated spectrometer; A processor connected to the spectrometer and the power module, and used to determine the relative spectral power distribution of the reference light source based on the relative spectral power distribution measured by the spectrometer, determine the chromaticity difference between the measured light source and the reference light source based on the relative spectral power distribution and the relative spectral power distribution of the reference light source, and obtain the color rendering index of the measured light source according to the color rendering index calculation principle based on the relative spectral power distribution of the measured light source and the relative spectral power distribution of the reference light source in combination with the spectral brightness coefficients of 15 standard color samples specified by CIE, when the chromaticity difference meets the set requirements; the processor is also used to control the power supply parameters of the measured light source to modify the color rendering index of the measured light source; The color rendering index measuring instrument is used to measure the color rendering index of the calibrated color rendering index adjustable light source; based on the determined color rendering index and the measured color rendering index of the calibrated color rendering index adjustable light source, the color rendering index measuring instrument is calibrated.

2. The device for multi-point calibration of a color rendering index measuring instrument according to claim 1, characterized in that: The device for multi-point calibration of a color rendering index measuring instrument also includes: A DC regulated power supply is connected to the display index adjustable light source and the processor, and is used to output current and voltage values ​​under the control of the processor to control the display index adjustable light source to continuously light up for a set time.

3. The device for multi-point calibration of a color rendering index measuring instrument according to claim 1, characterized in that: The wavelength range of the spectrum light power distribution of the CRI adjustable light source is between 380nm and 780nm; the adjustment range of the color rendering index of the CRI adjustable light source is at least 60-100.

4. The device for multi-point calibration of a color rendering index measuring instrument according to claim 2, characterized in that: The display index adjustable light source comprises: an integrating sphere, a light source and a baffle; The integrating sphere is provided with a light outlet and a light inlet; the light source is provided at the light inlet; the baffles are all provided in the integrating sphere, and the baffles are located between the light source and the light outlet; The light source is electrically connected to the DC regulated power supply.

5. The device for multi-point calibration of a color rendering index measuring instrument according to claim 4, characterized in that: The light source includes a plurality of light emitting diodes with different working parameters; different spectra are simulated by the plurality of light emitting diodes with different working parameters; the working parameters include central wavelength, narrow band and broadband.

6. A method for multi-point calibration of a color rendering index measuring instrument, characterized in that: The method for multi-point calibration of a color rendering index measuring instrument comprises: The relative spectral power distribution of the CRI adjustable light source under test is obtained by the calibrated spectrometer; Obtaining a correlated color temperature of the measured CRI adjustable light source based on the relative spectral power distribution of the measured CRI adjustable light source, and determining a relative spectral power distribution of a reference light source according to the correlated color temperature; Determine the chromaticity difference between the measured CRI adjustable light source and the reference light source based on the relative spectral power distribution of the measured CRI adjustable light source and the reference light source; Under the condition that the chromaticity difference meets the set requirements, according to the relative spectral power distribution of the measured light source and the relative spectral power distribution of the reference light source, combined with the spectral brightness coefficients of the 15 standard color samples specified by CIE, the color rendering index of the measured color rendering index adjustable light source is obtained according to the color rendering index calculation principle; The calibration of the indication of the color rendering index measuring instrument is completed based on the obtained color rendering index and the calibrated color rendering index of the color rendering index adjustable light source measured by the color rendering index measuring instrument.

7. The method for multi-point calibration of a color rendering index measuring instrument according to claim 6, characterized in that: Before the relative spectral power distribution of the adjustable light source is measured, it also includes: Controlling the optical power of multiple light emitting diodes in the display index adjustable light source to achieve different spectrum combinations; The spectrometer measures different spectral combinations to obtain relative spectral power distribution, obtains the color rendering index value corresponding to the current relative spectral power distribution through the processor, and stores the current value of the power module and the corresponding color rendering index in the database.

8. A computer device comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the method for multi-point calibration of a color rendering index measuring instrument according to any one of claims 6 to 7.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for multi-point calibration of a color rendering index measuring instrument according to any one of claims 6 to 7 is implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the method for multi-point calibration of a color rendering index measuring instrument according to any one of claims 6 to 7 is implemented.

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