A glare tester calibration device and calibration method thereof

Abstract

The present invention discloses a glare tester calibration device and a calibration method thereof, which include: using a spectral radiometer to measure the brightness values ​​of a glare source and background light, using a geometric measuring instrument to measure the spatial position value, calculating the glare value according to the principle of different glare values, and realizing the calibration of the glare tester by comparative calibration. The glare source and background light of the present invention cover the range of the Goose position index table and the entire field of view space, and the brightness of the glare source and the background light are respectively controlled by adjusting the magnitude of the power supply output voltage and current, and the brightness values ​​and geometric position parameters of the two are measured, so as to realize the simulation of glare values ​​in different scenes. The present invention has important support for the research and development and upgrading of glare test instruments, as well as the traceability and unification of the value of glare test values, and at the same time has positive significance for improving the quality of lighting design and protecting people's visual health.

Description

Technical Field

[0001] The invention relates to the technical field of instrument calibration, and in particular to a glare tester calibration device and a calibration method thereof. Background Art

[0002] With the development of lighting technology, people have a higher and higher demand for visual comfort in lighting environments. Glare is one of the important parameters for evaluating lighting quality and an important parameter that affects visual comfort. Glare is a visual observation condition caused by inappropriate brightness distribution and other reasons. At present, the current international standards, national standards and industry standards for indoor and outdoor lighting at home and abroad have unified glare value (UGR) and glare value (GR) detection requirements, but due to the lack of metrological standards for corresponding testing instruments, the instruments and equipment used to measure the unified glare value UGR have no traceability in China, resulting in the inability to compare the measurement results of different measuring equipment in various testing institutions.

[0003] The commonly used method for measuring UGR and GR at home and abroad is to directly measure the brightness distribution of the entire space through a glare measuring instrument based on a CCD camera image luminance meter, and directly calculate it by selecting the glare source and background brightness through software. This method avoids the complicated point-by-point measurement process and has a faster measurement speed, but it also has the problem that the single-point brightness cannot be fully matched to the surface brightness and the spatial geometric position information calculated by two-dimensional images is inaccurate with the actual three-dimensional spatial position. Through preliminary research, it was found that when different brands of glare testers on the market measure glare at the same position, the measurement results vary greatly. Therefore, it is necessary to establish a set of calibration methods and standard glare source devices to simulate and measure the standard values ​​of spatial brightness and geometric position, so as to further compare the glare values ​​measured by the calibrated glare tester. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a glare tester calibration device and a calibration method thereof, which are used to solve the problem that the glare values ​​measured by the glare testers on the market are not accurate and reliable and cannot be accurately calibrated. Starting from the basic definitions of unified glare value (UGR) and glare value (GR), the present invention studies the traceability method of all parameters in the glare definition, establishes a glare tester calibration method, and designs a set of standard glare source devices with multiple lighting sources that can provide UGR and GR covering the commonly used measurement range, and at the same time solves the problem of the lack of calibration method and standardized supporting equipment for glare testers.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] A glare tester calibration device, the calibration device is placed in a dark room environment, and the calibration device comprises:

[0007] High-precision spectral radiometer, which is used to accurately measure the brightness value and brightness distribution of glare sources and backlight sources;

[0008] A first standard glare source device is arranged in front of the high-precision spectral radiometer and is used to simulate the brightness of the glare source and the background light of different brightness, wherein the first standard glare source device is placed vertically in a dark room environment, that is, placed vertically on a horizontal plane;

[0009] A second standard glare source device is arranged in the top area directly in front of the above-mentioned high-precision spectral radiometer and is used to simulate the brightness of the glare source and the background light of different brightness, wherein the second standard glare source device is parallel to the horizontal plane in the darkroom environment and is at a certain distance from the bottom surface of the darkroom environment, and the above-mentioned high-precision spectral radiometer is arranged between the two;

[0010] A DC voltage- and current-stabilized power supply with multiple outputs, which is used to provide stable and adjustable voltage and current to the glare light source and backlight source, thereby controlling the change of their brightness;

[0011] Among them, the spatial geometric position parameters of the glare source and the backlight source are first measured; then the brightness value and brightness distribution of the glare source and the backlight source are measured by the high-precision spectral radiometer; then the standard glare value is calculated by the definition of two types of glare values, UGR and GR, and finally the glare tester to be calibrated is calibrated by comparing the standard glare value with the glare value actually measured by the glare tester to be calibrated, wherein the glare tester to be calibrated is also in the darkroom environment and in the same position as the high-precision spectral radiometer during actual measurement.

[0012] Furthermore, when calibrating the glare tester to be calibrated, if the difference between the glare value actually measured by the glare tester and the calculated standard glare value exceeds the error range, the glare tester is calibrated by calibrating the two component values ​​of the brightness value and the spatial geometry value measured by the glare tester.

[0013] Furthermore, the darkroom environment has an ambient illumination of <0.5 lx, and the wall surface is a black light-absorbing paint layer with a reflection coefficient of <0.1.

[0014] Furthermore, in the darkroom environment, the first standard glare source device and the second standard glare source device completely cover the entire field of view of the high-precision spectral radiometer, and the light-emitting surfaces of the two standard glare source devices are two vertical planes directly above and in front of the high-precision spectral radiometer, and the two planes are rectangles with a length and a width both greater than 3 meters.

[0015] Furthermore, the two standard glare source devices have the same structure, and both include:

[0016] A plurality of glare light sources with adjustable brightness are placed on a light-diffusing plate, a back plate is provided on the other side of the light-diffusing plate, and a backlight source is provided between the light-diffusing plate and the back plate; wherein the backlight source is a backlight source with adjustable brightness; the glare light source is a circular or square plane surface light source, which emits light directly after being powered.

[0017] Furthermore, the glare light source has uniform and adjustable light output brightness, with a brightness uniformity of 95% and a brightness change rate of <0.3% after stabilization.

[0018] Furthermore, the brightness of the background light is uniform and adjustable, with a brightness uniformity of 90% and a brightness change rate of <0.4% after stabilization.

[0019] Furthermore, the brightness of the glare source and the background light are adjusted by the DC voltage-stabilized and current-stabilized power supply, wherein the minimum brightness value of the glare source and the background light is 0 cd / m2, and the maximum brightness value needs to be greater than 10000 cd / m2.

[0020] A calibration method for a glare tester calibration device, the calibration method comprising:

[0021] Step S1, placing the glare tester calibration device in a dark room environment; wherein the dark room environment has an ambient illumination of <0.5 lx, and the wall surface is a black light-absorbing paint layer with a reflection coefficient of <0.1;

[0022] Step S2, using a calibrated geometric measuring instrument to measure and calculate: the size information of the light-emitting surface of the glare light source and the spatial geometric position parameters of the glare light source and the background light; wherein the spatial geometric position parameters include: the solid angle of the light-emitting surface of each glare light source in the observation direction of the high-precision spectral radiance meter as an observer, and the Goos position index of each glare light source;

[0023] Step S3, using a high-precision spectral radiometer to accurately measure the brightness value and brightness distribution of the glare source and the backlight source, and record the measured values;

[0024] Step S4, placing a glare tester to be calibrated in the environment, and obtaining and recording the glare value;

[0025] Step S5, using the geometric parameters obtained in step S2 and the brightness value and brightness distribution in step S3 to calculate the final glare value; then using the calculated final glare value to compare with the glare value actually measured by the glare tester in step S4 to calibrate it; wherein the final glare value includes: a unified glare value UGR for indoor scenes and a glare value GR for stadiums.

[0026] Furthermore, the unified glare value UGR is calculated by the following formula:

[0027]

[0028] In this formula, L α It is expressed as the brightness of each glare source in the observation direction with a high-precision spectral radiometer as the observer, L b It is represented as the background light brightness, ω is represented as the solid angle of the luminous surface of each glare source observed by the observer, and p is represented as the Goos position index of each glare source;

[0029] The glare value GR is calculated by the following formula:

[0030]

[0031] In this formula, L v1 It is expressed as the brightness of the light curtain generated by the light emitted by the light source directly directed to the high-precision spectral radiometer. The illuminance is on the vertical plane of the line of sight; L ve It is expressed as the brightness of the light curtain caused by the environment directly incident on the high-precision spectral radiometer.

[0032] The beneficial effects of the present invention are:

[0033] Compared with the current lack of standard specifications for glare testers and the simple calibration of single-point brightness during factory calibration of instruments, the present invention provides a scientific and standardized calibration method and a standard device to accurately calibrate the glare value measured by the glare tester, uses a high-precision spectral radiometer and a geometric measuring instrument to measure the brightness standard value and the spatial position geometric value standard value of the standard glare source device, calculates the glare value according to the definition to compare and calibrate the glare value measured by the glare tester, and can achieve the value traceability and unification of the glare test value. The present invention can guide the research and development upgrades of glare test instrument manufacturers and lighting engineers to improve the quality of lighting design. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic diagram of the overall structure of a glare tester calibration device provided in Example 1;

[0035] Figure 2 This is a schematic structural diagram of the standard glare source device provided in Example 1;

[0036] Figure 3 A 3D simulation effect diagram of the calibration scene of the glare tester provided in Example 2;

[0037] Figure 4 This is a schematic diagram of the principle of unified glare value (UGR);

[0038] Figure 5 This is a trend chart showing the effect of glare source brightness and background light brightness on UGR, where: Figure 5 (a) shows the trend of the effect of scene brightness on UGR. Figure 5 (b) Trend diagram showing the effect of glare source brightness on UGR;

[0039] Figure 6 Schematic diagram of the principle of glare value (GR);

[0040] Figure 7 It is a schematic diagram of the glare light source brightness adjustment and background light brightness adjustment control;

[0041] In the attached figure:

[0042] 1- high-precision spectral radiometer, 2- DC voltage-stabilized and current-stabilized power supply with multiple outputs, 3- first standard glare source device, 4- second standard glare source device, 5- backlight source, 6- glare source, 7- homogenizing plate. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] Example 1

[0045] See also Figure 1-Figure 2 This embodiment provides a glare tester calibration device, which is placed in a darkroom environment. The specific composition structure of the device is shown in Figure 1. The calibration device includes:

[0046] A high-precision spectral radiometer 1, which is used to accurately measure the brightness value and brightness distribution of the glare source 6 and the backlight source 5;

[0047] A first standard glare source device 3 is arranged in front of the high-precision spectral radiometer 1 and is used to simulate the brightness of the glare source and the background light of different brightness. The first standard glare source device 3 is placed vertically in a dark room environment, that is, placed vertically on a horizontal plane.

[0048] A second standard glare source device 4 is arranged in the top area directly in front of the above-mentioned high-precision spectral radiometer 1, and is used to simulate the brightness of the glare source and the background light of different brightness, wherein the second standard glare source device 4 is parallel to the horizontal plane in the darkroom environment, and is at a certain distance from the bottom surface of the darkroom environment, and the above-mentioned high-precision spectral radiometer 1 is arranged between the two;

[0049] Specifically, in this embodiment, the surface structures and optical effects of the two standard glare source devices are the same. Figure 2 As shown, specifically, the standard glare source device includes:

[0050] A plurality of glare light sources 6 with adjustable brightness are placed on a light scattering plate 7, a back plate is further arranged on the other side of the light scattering plate 7, and a backlight source 5 is further arranged between the light scattering plate 7 and the back plate; wherein the backlight source 5 is a large-area backlight source 5 with adjustable brightness; the glare light source 6 is a circular or square plane surface light source which is regular and convenient for accurate measurement of its size, and emits light directly after power is supplied; more specifically, the backlight source 5 is fixed on the inner back plate of the standard glare light source device by evenly distributed point light sources, and the light emitted after power is supplied passes through the light scattering plate to form background light.

[0051] The DC voltage- and current-stabilized power supply 2 with multiple outputs is used to provide stable and adjustable voltage and current to the glare source 6 and the backlight source 5, thereby controlling the change of their brightness.

[0052] Specifically, in this embodiment, by using the glare tester calibration device, accurate brightness values ​​and spatial position geometric values ​​are measured, and the standard glare value is calculated by defining the two types of glare values, UGR and GR, and the glare value measured by the glare source in the completely same spatial position and darkroom scene is compared. If the glare value measured by the glare tester and the standard value are out of the error range (glare value error <1), the calibration of the glare tester is achieved by calibrating the two component values ​​of the brightness value and the spatial geometric value measured by the glare tester.

[0053] Specifically, in this embodiment, the above-mentioned first standard glare source device 3 and the second standard glare source device 4 completely cover the entire field of view of the high-precision spectral radiometer 1. The light-emitting surfaces of the device are two vertical planes directly above and in front of the high-precision spectral radiometer 1. The two planes are rectangles with a length and a width of more than 3 meters. The device mainly simulates the glare source 6 and the backlight source 5, two important parts that affect glare.

[0054] Specifically, in this embodiment, the light output brightness of the glare source 6 is uniform and adjustable, with a brightness uniformity of 95% and a brightness change rate after stabilization of <0.3%. The glare source 6 is composed of a plurality of light sources with regular circular or square planes whose light output surfaces are convenient for accurate measurement of their dimensions, and are evenly installed on the surface of the standard glare source device.

[0055] Specifically, in this embodiment, the brightness of the background light is uniform and adjustable, with a brightness uniformity of 90% and a brightness change rate of <0.4% after stabilization. The background light is composed of a uniformly distributed point light source as a backlight source 5 installed inside a standard glare light source device, and a shading plate and a light-diffusion plate, thereby simulating uniform background light.

[0056] More specifically, in this embodiment, the glare source 6 and the backlight source 5 are both powered by direct current, and the voltage and current output by the DC voltage and current regulated power supply are used to control the brightness of the glare source 6 and the brightness of the backlight source 5 respectively. The brightness of the two can be adjusted in a wide range, with the minimum brightness value being 0 cd / m2 and the maximum brightness value being required to be greater than 10000 cd / m2, meeting the applicable range of the unified glare value (UGR) and the glare value (GR) characterization.

[0057] Example 2

[0058] With respect to the glare tester calibration device provided in Example 1, this embodiment provides a calibration method for the glare tester calibration device, see Figure 3-Figure 7 , the calibration method specifically includes:

[0059] Step S1: Place the glare tester calibration device in a dark room. The 3D simulation effect diagram of the entire scene in the use state is as follows: Figure 3 As shown; wherein, the darkroom environment has an ambient illumination of <0.5lx, and the wall is a black light-absorbing paint layer with a reflection coefficient of <0.1;

[0060] Step S2, using a calibrated geometric measuring instrument to measure and calculate: the size information of the light-emitting surface of the glare light source and the spatial geometric position parameters of the glare light source and the background light; wherein the spatial geometric position parameters include: the solid angle of the light-emitting surface of each glare light source in the observation direction of the high-precision spectral radiometer as an observer, the solid angle of the solid angle as follows: Figure 4 As shown; and, the Goos position index for each glare source;

[0061] Specifically, in this embodiment, the spatial geometric position parameters of the glare source and the background light specifically include:

[0062] A three-dimensional coordinate system is constructed with the high-precision spectral radiometer as the coordinate origin; the position parameters of the glare source and the background light in the three-dimensional coordinate system are then measured, wherein the distance from the center of the light-emitting surface of the glare source to the high-precision spectral radiometer is an important parameter;

[0063] Then measure the angle ω formed by the line connecting the edge of the glare source's light-emitting surface and the spectral radiometer, which is as follows: Figure 4 shown.

[0064] Step S3, using a high-precision spectral radiometer to accurately measure the brightness value and brightness distribution of the glare source and the backlight source, and record the measured values;

[0065] Step S4, placing a glare tester to be calibrated in the environment, and obtaining and recording the glare value;

[0066] Step S5, using the geometric parameters obtained in step S2 and the brightness value and brightness distribution in step S3 to calculate the final glare value; then using the calculated final glare value to compare with the glare value actually measured by the glare tester in step S4 to calibrate it; the final glare value includes: a unified glare value (UGR) for indoor scenes and a glare value (GR) for stadiums.

[0067] Specific as Figure 4 As shown, the unified glare value (UGR) is calculated by the following formula:

[0068]

[0069] In this formula, L α It is expressed as the brightness of each glare source in the direction of the observer (cd / m 2 ), L b Expressed as background light brightness (cd / m 2 ), ω represents the solid angle (sr) of the luminous surface of each glare source observed by the observer, and p represents the Goos position index of each glare source;

[0070] Specifically, in this embodiment, the above ω and p are measured and calibrated by the spatial position layout diagram of the instrument and the device and the geometric measurement tool; the brightness L of the glare source luminous surface α and background light brightness L b It is an important parameter affecting UGR. Both can be measured and calibrated by a spectral radiometer.

[0071] More specifically, in this embodiment, if Figure 5As shown in the figure, through simulation calculation, when the geometric parameters are fixed, the background light brightness remains unchanged, and the influence trend of the glare source brightness change on UGR; and the glare source brightness remains unchanged, the influence trend of the background light brightness change on UGR, according to the influence trend of UGR, the glare source device can be used to output different glare source brightness and background light brightness, and the UGR value in different scenes can be calculated according to the above formula, and the same scene is kept and the UGR value in the same situation is measured by the glare tester that needs to be calibrated, so the calibration of the glare tester can be achieved by comparing and calibrating the intermediate parameters and the final unified glare value (UGR).

[0072] Specifically, in this embodiment, if Figure 6 The figure shows the principle diagram of calculating the glare value (GR), that is, the glare value (GR) and its intermediate parameters measured by the glare tester are calibrated according to the same principle as above; it can be seen from the figure that the glare value (GR) is related to the brightness of the light curtain generated by the light emitted by the light source directly incident on the eyes and the brightness of the light curtain generated by the light directly incident on the eyes caused by the environment, and is specifically calculated by the following formula:

[0073]

[0074] In this formula, L v1 It is the brightness of the light curtain generated by the light emitted by the light source directly hitting the eyes. In this embodiment, this value is the illuminance on the observer's eyes, that is, the illuminance value on the lens of the glare test instrument. The illuminance is on the vertical plane of the line of sight; L ve It is expressed as the brightness of the light curtain caused by the light directly incident on the eye (that is, the lens of the glare test instrument) caused by the environment, which is 0.035 times the average brightness of the visible horizontal illumination field.

[0075] Therefore, the calibration of the glare value (GR) measured by the glare tester and the calibrated illuminance meter in combination with the standard glare source device of the present invention can realize the calibration of the glare tester through comparison and calibration of the intermediate parameter and the final glare value (GR). It is worth noting that for GR, the sight line direction should be lower than the eye height, and the background seen by the observer should be the illuminated site. The implementation process and the calibration of other types of glare values ​​will not be described in detail.

[0076] Specifically, in this embodiment, if Figure 7As shown in the figure, the schematic diagram of glare source brightness adjustment and background light brightness adjustment control is used to control the magnitude of voltage and current of driving glare source and backlight source through a high-precision, stable and adjustable power supply with multiple voltage and current outputs, so as to control the magnitude of simulated glare source brightness and background light brightness. Through the above definition and principle analysis of different glare values, such as the unified glare value (UGR) used for indoor scenes and the glare value (GR) used for stadiums, the glare source brightness and background light brightness range corresponding to different glare value ranges can be calculated by simulating the glare source brightness and background light brightness, and the voltage value and current value of controlling the glare source and backlight source at this time can be calibrated, so that a lookup table can be established to record the output voltage value and current value of the multi-channel output and adjustable voltage and current regulated power supply corresponding to different glare levels, so as to facilitate the subsequent rapid calibration of glare testers of different manufacturers. Of course, the entire standard glare source device also needs to be calibrated for each parameter regularly.

[0077] In summary, the present invention uses a spectral radiometer to measure the brightness values ​​of the glare source and background light, uses a geometric measuring instrument to measure the spatial position value, calculates the glare value according to the principle of different glare values, and realizes the calibration of the glare tester by comparative calibration. The glare source and background light of the present invention cover the range of the Gus position index table and the entire field of view space. The brightness of the glare source and the brightness of the background light are respectively controlled by adjusting the output voltage and current of the DC voltage-stabilized and current-stabilized power supply, and the brightness values ​​and geometric position parameters of the two are measured, so as to realize the simulation of the glare value in different scenes. The device can realize the adjustable dynamic range of the glare value, and can also analyze the measurement accuracy of intermediate parameters such as solid angle, brightness, and position. It has important support for the research and development and upgrading of glare test instruments, as well as the traceability and unification of the value of glare test values. At the same time, it has positive significance for improving the quality of lighting design and protecting people's visual health.

[0078] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

[0079] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A glare tester calibration device, characterized in that: The calibration device is placed in a darkroom environment, and the calibration device comprises: High-precision spectral radiometer, which is used to accurately measure the brightness value and brightness distribution of glare sources and backlight sources; A first standard glare source device is arranged in front of the high-precision spectral radiometer and is used to simulate the brightness of the glare source and the background light of different brightness, wherein the first standard glare source device is placed vertically in a dark room environment, that is, placed vertically on a horizontal plane; A second standard glare source device is arranged in the top area directly in front of the above-mentioned high-precision spectral radiometer and is used to simulate the brightness of the glare source and the background light of different brightness, wherein the second standard glare source device is parallel to the horizontal plane in the darkroom environment and is at a certain distance from the bottom surface of the darkroom environment, and the above-mentioned high-precision spectral radiometer is arranged between the two; A DC voltage- and current-stabilized power supply with multiple outputs, which is used to provide stable and adjustable voltage and current to the glare light source and backlight source, thereby controlling the change of their brightness; Among them, firstly, the spatial geometric position parameters of the glare source and the backlight source are measured; then, the brightness value and brightness distribution of the glare source and the backlight source are measured by the high-precision spectral radiometer; then, the standard glare value is calculated by the definition of two types of glare values, UGR and GR; finally, the glare tester to be calibrated is calibrated by comparing the standard glare value with the glare value actually measured by the glare tester to be calibrated, wherein, during the actual measurement, the glare tester to be calibrated is also in the darkroom environment and in the same position as the high-precision spectral radiometer; The two standard glare source devices have the same structure, and both include: A plurality of glare light sources with adjustable brightness are placed on a light-diffusing plate, a back plate is provided on the other side of the light-diffusing plate, and a backlight source is provided between the light-diffusing plate and the back plate; wherein the backlight source is a backlight source with adjustable brightness; the glare light source is a circular or square plane surface light source, which emits light directly after being powered.

2. A glare tester calibration device according to claim 1, characterized in that: When calibrating the glare tester to be calibrated, if the difference between the glare value actually measured by the glare tester and the calculated standard glare value exceeds the error range, the calibration of the glare tester is achieved by calibrating the two component values ​​of the brightness value and the spatial geometry value measured by the glare tester.

3. The glare tester calibration device according to claim 1, characterized in that: The darkroom environment has an ambient illumination of <0.5 lx, and the wall surface is a black light-absorbing paint layer with a reflection coefficient of <0.

1.

4. The glare tester calibration device according to claim 1, characterized in that: In the darkroom environment, the first standard glare source device and the second standard glare source device completely cover the entire field of view of the high-precision spectral radiometer. The light-emitting surfaces of the two standard glare source devices are two vertical planes directly above and in front of the high-precision spectral radiometer, and the two planes are rectangles with a length and a width both greater than 3 meters.

5. The glare tester calibration device according to claim 1, characterized in that: The glare light source has uniform and adjustable light output brightness, with a brightness uniformity of 95% and a brightness change rate of less than 0.3% after stabilization.

6. The glare tester calibration device according to claim 1, characterized in that: The brightness of the background light is uniform and adjustable, with a brightness uniformity of 90% and a brightness change rate of <0.4% after stabilization.

7. The glare tester calibration device according to claim 1, characterized in that: The brightness of the glare source and the background light are adjusted by the DC voltage-stabilized and current-stabilized power supply, wherein the minimum brightness value of the glare source and the background light is 0 cd / m2, and the maximum brightness value needs to be greater than 10000 cd / m2.

8. A calibration method using a glare tester calibration device as claimed in any one of claims 1 to 7, characterized in that: The calibration method comprises: Step S1, placing the glare tester calibration device in a dark room environment; wherein the dark room environment has an ambient illumination of <0.5 lx, and the wall surface is a black light-absorbing paint layer with a reflection coefficient of <0.1; Step S2, using a calibrated geometric measuring instrument to measure and calculate: the size information of the light-emitting surface of the glare light source and the spatial geometric position parameters of the glare light source and the background light; wherein the spatial geometric position parameters include: the solid angle of the light-emitting surface of each glare light source in the observation direction of the high-precision spectral radiance meter as an observer, and the Goos position index of each glare light source; Step S3, using a high-precision spectral radiometer to accurately measure the brightness value and brightness distribution of the glare source and the backlight source, and record the measured values; Step S4, placing a glare tester to be calibrated in the environment, and obtaining and recording the glare value; Step S5, using the geometric parameters obtained in step S2 and the brightness value and brightness distribution in step S3 to calculate the final glare value; then using the calculated final glare value to compare with the glare value actually measured by the glare tester in step S4 to calibrate it; wherein the final glare value includes: a unified glare value UGR for indoor scenes and a glare value GR for stadiums.

9. The calibration method of a glare tester calibration device according to claim 8, characterized in that: The unified glare value UGR is calculated by the following formula: In this formula, L α It is expressed as the brightness of each glare source in the observation direction with a high-precision spectral radiometer as the observer, L b It is represented as the background light brightness, ω is represented as the solid angle of the luminous surface of each glare source observed by the observer, and p is represented as the Goos position index of each glare source; The glare value GR is calculated by the following formula: In this formula, L v1 It is expressed as the brightness of the light curtain generated by the light emitted by the light source directly directed to the high-precision spectral radiometer. The illuminance is on the vertical plane of the line of sight; L ve It is expressed as the brightness of the light curtain caused by the environment directly incident on the high-precision spectral radiometer.

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