Spatial light distribution measuring device

Abstract

The utility model provides a spatial light distribution measuring device, which aims to solve the problems of large size, complicated operation, high cost, slow measuring speed or large measuring error of the conventional measuring device, and comprises a base body with a plurality of holes, an imaging lens and a photoelectric detector, diffusion fillers are filled in the holes; the detected luminous body is arranged on one side of the base body, and the imaging lens and the photoelectric detector are arranged on the other side of the base body; light emitted by a detected luminous body irradiates the base body, diffused light is generated after the light is diffused by the diffusion filler, the diffused light is received by the photoelectric detector through the imaging lens, an image containing each hole is obtained, and spatial light distribution of the detected luminous body is obtained through analysis.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of optical radiation measurement, specifically relates to a spatial light distribution measuring device. BACKGROUND

[0002] Common luminous bodies such as LED (light-emitting diode), LCD (liquid crystal display), OLED (organic light-emitting diode), MiniLED and MicroLED light sources and various lighting products or display products composed of them have been widely used in decoration, urban night scene, road, traffic and other lighting display fields due to their energy-saving, long service life, fast response speed and other advantages. However, due to the directional and uneven distribution characteristics of the luminous body light emission, the light emitted at different angles usually has different brightness and chrominance. Therefore, the spatial light distribution characteristics of the luminous body become an important indicator for analyzing and evaluating product performance and quality.

[0003] The spatial light distribution measurement of the existing luminous body mostly uses a distribution radiometer or a distribution photometer to scan the entire space to obtain spatial light distribution information and irradiance distribution on a specified distance plane, and the measurement precision is high. However, when multiple spatial angle data need to be obtained, the test time is long and the test efficiency is low due to the use of a mechanical rotating structure, which is not suitable for production line application. In addition, when using the scanning test method, there is a certain distance between the detector and the measured luminous body, which usually needs to be tested in a darkroom environment. The darkroom size is large and the cost is high. If no special treatment is done or the test is not done in the darkroom, environmental light and other stray light will also enter the detector, affecting the measurement precision. UTILITARY MODEL CONTENT

[0004] In view of the deficiencies of the prior art, the utility model provides a spatial light distribution measuring device, which solves the problems of large size, complicated operation, high cost, slow measurement speed or large measurement error of the existing measuring device.

[0005] To achieve the above-mentioned purpose, the utility model provides a spatial light distribution measuring device, which comprises a base body with a plurality of holes, an imaging lens and a photoelectric detector. The plurality of holes are arranged at intervals on the base body, and the holes are filled with a diffuse filler. The measured luminous body is arranged on one side of the base body, and the imaging lens and the photoelectric detector are arranged on the other side of the base body. The light emitted by the measured luminous body irradiates on the base body, and the diffuse light is generated after diffusing through the diffuse filler. The imaging lens images the base body on the photoelectric detector to obtain the image of each hole on the base body.

[0006] The measured light-emitting body can be an LED, an LCD, an OLED, a MiniLED, a MicroLED light source, and various lighting products or display products composed of the light sources. The photoelectric detector comprises an image sensor and an image processing unit, the image processing unit is in communication connection with the image sensor, the image processing unit is used for processing each pixel in the image generated by the image sensor, and then the spatial light distribution of the measured light-emitting body is obtained. The image sensor is a two-dimensional array detector, for example, a CMOS or CCD two-dimensional surface array detector. The spatial light distribution includes but is not limited to light intensity distribution, brightness distribution, radiance distribution, and radiant intensity distribution. In the technical solution, the filler (for example, transparent glue or thermoplastic plastic) with diffuse transmission performance is filled in each hole of the base, according to the spatial relative position relationship between each hole and the measured light-emitting body and the spatial relative position relationship between each hole and the imaging lens, the relationship between each pixel point (or each pixel region) of the image sensor and the spatial emission angle of the to-be-measured region of the measured light-emitting body can be established. In actual measurement, the light emitted by the measured light-emitting body is irradiated onto the base, is uniformly scattered by the diffusing filler in each hole, and diffused light is generated, the diffused light is received by the photoelectric detector through the imaging lens, each hole corresponds to a specific spatial angle, and the image of each hole is formed on the photoelectric detector, each hole corresponds to a pixel point or a pixel region of the image sensor, and through conversion, the light distribution information related to the spatial angle of the measured light-emitting body, such as light intensity, brightness, chrominance, radiance, and radiant intensity, can be obtained. The utility model has the advantages of simple operation, fast measurement speed, and high measurement accuracy.

[0007] As a technical solution, the utility model also includes shading assembly, shading assembly is coupled with base connection, shading assembly is equipped with sampling port, measures when the measured light-emitting body is placed at sampling port, and the light emitted by the measured light-emitting body is irradiated onto the base through the sampling port. Through the design of shading assembly, the external ambient stray light can be effectively shielded, and the spatial light distribution characteristics of the measured light-emitting body can be measured simultaneously and quickly and accurately. It should be noted that the sampling port can limit the size of the measured light-emitting body or the to-be-measured region of the measured light-emitting body, and the size and shape of the sampling port can be set according to actual measurement requirements, and the size of the sampling port is relatively small.

[0008] In some optional embodiments, the shading assembly can be a planar shell, and the planar shell is provided with a sampling port for accommodating the measured light-emitting body. The shading assembly can also be a conical shell, which can be determined according to measurement requirements. Preferably, the inner side of the shading assembly facing the base is sub-matte black, which can absorb reflected light from the base to ensure the accuracy of the measurement results.

[0009] As a technical solution, the base body can be in a curved shape or a planar shape, such as a curved screen or a planar screen, or a curved shell or a planar panel, etc. When the base body is in a curved shape, the sampling port is located on the side of the base body that is concave inward, and the imaging lens and the photodetector are located on the side of the base body that is concave outward.

[0010] In some optional embodiments, the base body is in a 1 / 2 circular arc shape or other specifications of a circular arc surface, and each diffusing filler is distributed in a grid shape in the base body. The inner wall of the base body is in a matt black color, or the inner wall is coated with a black coating, thereby saving space and cost and effectively avoiding the influence of stray light. A regular base body shape, such as a hemispherical shape, can obtain images that are more uniformly distributed. It should be noted that the shape of the base body is not limited to a hemispherical shape, and can also be a cuboid shape, a square shape, an ellipsoidal shape, or a part of a sphere, etc. This is only an example. The base body can be designed according to actual measurement needs, thereby adapting to the detection of different types of measured luminous bodies and improving the compatibility of the utility model.

[0011] In some optional embodiments, the size of the base body surface hole is relatively small, ensuring that each hole filled with the diffusing filler only receives parallel light from a certain specific angle of the measured luminous body, that is, the light entering the hole is parallel light, so that the light distribution information of the measured luminous body under different viewing angles is obtained through image analysis by the photodetector, which is simple, efficient, and highly practical.

[0012] As a technical solution, the diffusing filler is a matrix material mixed with diffusing and transmitting particles, or a matrix material that has diffusing and transmitting properties. The matrix material includes but is not limited to at least one of resin, plastic, glue, or other compounds with diffusing and transmitting properties, or any combination of these materials. For example, the matrix material can be epoxy resin, acrylic ester, silicone, thermoplastic, transparent glue, which is convenient to inject into the holes of the base body and automatically solidify and form according to the shape and size of the holes, ensuring that the holes of the base body are uniformly and completely filled, avoiding problems such as light leakage or uneven scattering, making the measurement more stable and reliable. On the other hand, these matrix materials have high transparency, which can minimize the absorption and attenuation of light while achieving diffusing and transmitting functions, ensuring that the light can effectively pass through, thereby improving the accuracy of the measurement.

[0013] In some optional embodiments, the diffusing filler is glue mixed with diffusing and transmitting particles. According to different measurement requirements and the characteristics of the measured luminous body, the size, concentration, or transparency of the glue can be changed to accurately control the degree and uniformity of light scattering, thereby meeting more extensive measurement requirements.

[0014] As a technical solution, the substrate surface has a low-reflective material coating (for example, a black coating), or the substrate is made of a low-reflective metal material. The low-reflective material coating or the low-reflective metal material can maintain a low reflectivity in a wide wavelength range, and can effectively prevent stray light from being formed by the reflection of light emitted by the measured luminary on the internal surface of the substrate, thereby improving the measurement accuracy.

[0015] As a technical solution, the holes on the substrate surface are arranged at equal intervals in the circumferential direction. The cross-sectional shape of the holes can be circular or elliptical, and the shape and arrangement of the holes can be reasonably designed according to the positional relationship of the structural units, thereby improving the compatibility and practicability of the measurement device. The size and number of the holes determine the accuracy of the measurement of the light distribution characteristics of the measured luminary, and can be set according to actual measurement needs.

[0016] As a technical solution, the measurement device further comprises a sample stage, and the measured luminary is placed on the sample stage. The position of the measured luminary is adjusted by moving the sample stage, so that the to-be-measured region of the measured luminary is placed at the sampling port, thereby realizing the measurement of different regions of the measured luminary.

[0017] As a technical solution, the measurement device further comprises a standard light source for calibrating the photoelectric detector, and the standard light source has known spatial light distribution information. The spatial light distribution information includes, but is not limited to, spatial brightness distribution, spatial light intensity distribution, spatial radiance distribution, spatial radiant intensity distribution, or spatial chrominance distribution, or a combination of two or three parameters therebetween. Specifically, the standard light source is placed at the sampling port to calibrate the photoelectric detector. The known spatial light intensity distribution or brightness distribution of the standard light source is used, and the corresponding relationship between each pixel point or each pixel region centered on the pixel point of the image sensor in the photoelectric detector and the spatial angle is used. By comparing the response value of the pixel point with the actual light intensity value or brightness value of the standard light source at the spatial angle, the calibration coefficient of the pixel point is calculated. The measurement result obtained by using the calibrated photoelectric detector is more accurate. It should be noted that the distance and angle between the photoelectric detector and the substrate are fixed before and after calibration. This technical solution is relatively simple and easy to operate, and does not require complex debugging and debugging equipment. Through the calibration process, the system error and inconsistency between pixels that may exist in the photoelectric detector are eliminated, which is suitable for measuring different types and specifications of luminaries, and improves the accuracy, universality and flexibility of the system.

[0018] Further, the light emitting angle of the standard light source covers the spatial angle range corresponding to all the holes on the substrate, or the standard light source rotates around the center of the sampling port, thereby realizing the light distribution calibration in a large angle range. This technical solution can effectively calibrate each hole on the substrate, thereby being suitable for the light distribution test of different measured luminaries, while ensuring the consistency and accuracy of the measurement result.

[0019] As a technical solution, the center of the sampling port is located on the geometric center axis of the base body. For a regular-shaped base body, the to-be-measured region of the measured sample is placed on the geometric center axis, a more uniform and true image can be obtained, and the image processing in the later stage is facilitated.

[0020] As a technical solution, the field of view area of the imaging lens covers the base body, for example, a wide-angle lens, and the images of all the holes on the base body can be captured at one time, and the measurement is simple and efficient.

[0021] As another technical solution, a motion mechanism is further included, the imaging lens is arranged on the motion mechanism, and the imaging lens is driven to different positions by the motion mechanism to capture images containing holes, and the images overlap each other. The technical solution enables the relative motion between the base body and the imaging lens, realizes measurement at different angles, and obtains the image containing all the holes through splicing and cropping processing. The motion mechanism includes a rotating mechanism and / or a translating mechanism, and the motion includes rotating and / or translating.

[0022] As another technical solution, the photoelectric detector and the imaging lens are two or more groups, and different regions of the measurement base body are aligned, the different regions overlap each other, and the image containing all the holes is obtained through splicing and cropping processing. The technical solution can effectively solve the problem of incomplete and incorrect measurement caused by the field of view limitation of the imaging lens, and accurately obtain the spatial light distribution information of the measured luminous body.

[0023] As a technical solution, a color filter is arranged on the light path between the imaging lens and the photoelectric detector or in front of the imaging lens. The color filter can be a color filter matched with the human eye luminous efficiency function V(λ) or a color filter matched with the CIE color matching functions x(λ), y(λ) and z(λ), or a band-pass color filter. The design of the color filter makes the spectral response function of the photoelectric detector matched with the human eye luminous efficiency function V(λ), and ensures the accuracy and reliability of the measurement result.

[0024] As a further limitation and improvement of the above technical solution, a switching device is further included, and the color filter is sequentially cut into the measurement light path through the switching device. The switching device can be a color filter wheel or a color filter wheel group.

[0025] The space light distribution measuring device has the advantages of rapid and accurate measurement, simple structure, convenient installation, low cost and the like, the measured luminous body is directly placed in the sampling port, complex alignment operation is not needed, and efficient and accurate measurement of light distribution information of the measured luminous body at different angles is realized. BRIEF DESCRIPTION OF DRAWINGS

[0026] ATTACHFigure 1 Schematic diagram of the measuring device for Example 1.

[0027] Figure 1 Figure 2 Schematic diagram of the measuring device for Example 2.

[0028] Figure 2 Figure 3 Schematic diagram of the arrangement of holes on the substrate in Example 2.

[0029] Figure 3 Figure 4 Schematic diagram of the diffusive filler in Example 2.

[0030] Figure 4 Figure 5 Schematic diagram of the measuring device for Example 3.

[0031] Figure 5 Figure 6 Schematic diagram of the image taken in Example 3.

[0032] Figure 6 Figure 7 Schematic diagram of the measuring device for Example 4.

[0033] Figure 7 Figure 8 Schematic diagram of the measuring device for Example 5.

[0034] In the figure, 1 - imaging lens, 2 - sampling port, 3 - photodetector, 4 - substrate, 5 - diffusive filler, 6 - measured luminary, 7 - sample stage, 8 - light shielding assembly. DETAILED DESCRIPTION

[0035] The utility model will be further described below in combination with examples, but the utility model is not limited to the following examples.

[0036] Example 1

[0037] This example discloses a spatial light distribution measuring device, like Figure 1As shown, it comprises a shell, a base body 4 with a plurality of holes, an imaging lens 1 and a photoelectric detector 3 in the shell, the plurality of holes are uniformly spaced on the base body 4, and the holes are filled with a diffuse filler 5; the shell further comprises a light shielding assembly 8, the light shielding assembly 8 is coupled to the base body 4, and a sampling port 2 is arranged on the light shielding assembly 8, the sampling port 2 is located on one side of the base body 4, and the imaging lens 1 and the photoelectric detector 3 are arranged on the other side of the base body 4. It also includes a sample stage 7, the measured luminary 6 is placed on the sample stage 7, the position of the measured luminary 6 is adjusted by moving the sample stage 7 so that the to-be-measured area of the measured luminary 6 is placed at the sampling port 2; the light emitted by the measured luminary 6 is irradiated onto the base body 4 through the sampling port 2, and the diffuse light is generated after being diffused by the diffuse filler 5, the base body 4 is imaged onto the photoelectric detector through the imaging lens 1, and the images of each hole on the base body are obtained. In this embodiment, the light shielding assembly 8 is a sub-light black circular arc shell; the base body 4 is a plane plate made of a low-reflective metal material, the size of the holes on the surface of the base body 4 is relatively small; the diffuse filler 5 is a thermoplastic plastic with diffuse performance, which is solidified and filled in the holes of the base body 4; the measured luminary 6 can be an LED, an LCD, an OLED, a MiniLED and a MicroLED light source, the imaging lens 1 is a wide-angle lens, the photoelectric detector 3 comprises a high-resolution image sensor and an image processing unit, the image processing unit is used for processing each pixel in the image generated by the image sensor, and then the spatial brightness distribution or the light intensity distribution of the measured luminary is obtained.

[0038] Embodiment two

[0039] This embodiment discloses a spatial light distribution measuring device, as shown in Figure 2 It comprises a light shielding assembly 8, a base body 4 with a plurality of holes, an imaging lens 1 and a photoelectric detector 3, the plurality of holes are uniformly spaced on the base body 4, as shown in Figure 3 The holes are filled with a diffuse filler 5, the diffuse filler 5 is transparent glue mixed with diffuse transmission particles, as shown in Figure 4As shown. In this embodiment, the light-shielding component 8 is a matte black flat plate; the substrate 4 is a curved shell with a black coating on its surface. The light-shielding component 8 is coupled to the substrate 4, and a sampling port 2 is provided on the light-shielding component 8. The sampling port 2 is located on the concave side of the substrate 4 and is on the geometric central axis of the substrate; the imaging lens 1 and the photodetector 3 are located on the concave side of the substrate 4. The light source 6 to be tested is placed at the sampling port 2. The light emitted by the light source 6 to be tested shines on the substrate 4 through the sampling port 2. After being diffused by the diffuser filler 5, diffused light is generated. The imaging lens 1 images the substrate 4 onto the photodetector to obtain the image of each hole on the substrate. The light source 6 to be tested can be an LED, LCD, OLED, MiniLED, or MicroLED planar light source product. The imaging lens 1 is a wide-angle lens. The photodetector 3 includes a high-resolution CCD two-dimensional array sensor and an image processing unit. The image processing unit is used to process each pixel in the image generated by the CCD two-dimensional array sensor to obtain the spatial brightness distribution or light intensity distribution of the light source to be tested.

[0040] Example 3

[0041] This embodiment discloses a spatial light distribution measurement device, such as... Figure 5 As shown, the system includes a substrate 4, a light-shielding assembly 8, a sample stage 7, an imaging lens 1, and a photodetector 3. The light-shielding assembly 8 is a matte black substrate with a sampling port 2 on it. The substrate 4 is a hemispherical shell, with the sampling port 2 located on the concave side of the substrate 4, and the imaging lens 1 and photodetector 3 located on the convex side of the substrate 4; the center of the sampling port 2 is located at the geometric center of the substrate 4. The substrate 4 has several holes, which are equidistantly spaced circumferentially. The substrate 4 is made of a low-reflection metal material, and the holes are filled with epoxy resin with diffuse transmission properties. In this embodiment, the light-emitting body 6 under test is an LED display screen. The three imaging lenses 1 and photodetector 3 are respectively arranged in different directions and aligned with different areas of the measurement substrate 4, and the different areas overlap; the photodetector 3 includes a high-resolution CMOS two-dimensional area array sensor and an image processing unit. This embodiment also includes a standard light source with known spatial light distribution information for calibrating the photodetector 3. Before measurement, a standard light source is placed at sampling port 2 to calibrate the photodetector 3. The calibrated photodetector 3 is then used to measure the spatial light distribution of the luminescent body under test. During measurement, the luminescent body under test 6 is placed on the sample stage 7. The position of the luminescent body under test 6 is adjusted by moving the sample stage 7 so that the area to be measured of the luminescent body 6 is placed at sampling port 2. The light emitted from the area to be measured of the luminescent body 6 illuminates the substrate 4 through sampling port 2. After being diffused by the diffuser, diffused light is generated. The substrate 4 is imaged onto the photodetector through the imaging lens 1, obtaining images of each hole on the substrate, such as... Figure 6As shown, the image containing all the diffuse transmission elements is obtained through splicing and cropping processing, and the brightness distribution or light intensity distribution of the measured light emitter is obtained through further analysis.

[0042] Embodiment Four

[0043] The embodiment discloses a spatial light distribution measuring device, which comprises a base body 4, a light shielding assembly 8, an imaging lens 1 and a photoelectric detector 3. Figure 7 As shown, the base body 4 is a curved shell, the light shielding assembly 8 is a conical shell, the light shielding assembly 8 is coupled to the base body 4, and the inner side of the light shielding assembly 8 facing the base body 4 is a matt black color. A sampling port 2 is arranged on the light shielding assembly 8, the sampling port 2 is located on the side of the base body 4 which is concave, the imaging lens 1 and the photoelectric detector 3 are located on the side of the base body 4 which is convex, the surface of the base body 4 has a plurality of holes, the size of the holes is relatively small, the holes are filled with a diffuse filler 5, the diffuse filler is a resin mixed with diffuse transmission particles, and the base body 4 is made of a low-reflective metal material. The embodiment also comprises a standard light source with known spatial light distribution information for calibrating the photoelectric detector 3. Before measurement, the standard light source is placed at the sampling port to calibrate the photoelectric detector 3, and the calibrated photoelectric detector 3 is used to measure the spatial light distribution of the measured light emitter. During measurement, the measured light emitter 6 is placed at the sampling port, the light emitted by the measured light emitter 6 irradiates on the base body 4, the diffuse transmission light is generated through the diffuse filler 5, the base body 4 is imaged on the photoelectric detector through the imaging lens 1, and the images of the holes on the base body are obtained. In the embodiment, the measured light emitter 6 can be an LED, an LCD, an OLED, a MiniLED and a MicroLED light source. The imaging lens 1 and the photoelectric detector 3 are arranged on a rotating mechanism, the imaging lens 1 is driven to different angles through the rotating mechanism, the measurement at different angles is realized, the image containing all the diffuse transmission elements is obtained through splicing and cropping processing, and the spatial brightness distribution or light intensity distribution of the measured light emitter is obtained through further analysis.

[0044] Embodiment Five

[0045] The embodiment discloses a spatial light distribution measuring device, which comprises a base body 4, a light shielding assembly 8, an imaging lens 1 and a photoelectric detector 3. Figure 8As shown, it comprises a shell, the shell comprises a base body 4 with a plurality of holes, an imaging lens 1 and a photoelectric detector 3, the plurality of holes are uniformly spaced on the base body 4, and the holes are filled with a diffuse filler 5; the base body 4 is in a curved surface shape; the shell further comprises a light shielding assembly 8, the light shielding assembly 8 is a conical shell, is coupled with the base body 4, a sampling port 2 is arranged on the light shielding assembly 8, and the sampling port 2 is located on the side of the base body 4 which is concave, and the imaging lens 1 and the photoelectric detector 3 are located on the side of the base body 4 which is convex. The concave side of the base body 4 has a black coating, the diffuse filler 5 is mixed by epoxy resin, acrylate and silicone resin with diffuse transmission performance, and is filled in the holes of the base body 4 after curing. The measured luminary 6 in the embodiment is an OLED display screen. The imaging lens 1 and the photoelectric detector 3 comprise three groups of high-resolution CCD image sensors and image processing units, the three groups of imaging lens 1 and the photoelectric detector 3 are arranged at different positions and are aligned with different areas of the measurement base body 4, the different areas overlap, and then the images of the holes are formed on the image sensor. During measurement, the measured luminary 6 is placed on the sample stage 7, the position of the measured luminary 6 is adjusted by moving the sample stage 7 so that the to-be-measured area of the measured luminary 6 is placed at the sampling port 2, the light emitted by the to-be-measured area of the measured luminary 6 is irradiated on the base body 4, the diffuse transmission light is generated through the diffuse filler 5, the base body 4 is imaged on the photoelectric detector through the imaging lens 1, the images of the holes on the base body are obtained, the images containing all the diffuse transmission elements are obtained through splicing and cutting processing, and the light distribution information related to the spatial angle of the measured luminary, such as luminous intensity, brightness, chrominance, radiance, radiant intensity and the like, is further analyzed and obtained.

[0046] The specific embodiments of the utility model are described above with reference to the drawings, but those skilled in the art should understand that the above examples are only for illustration, and are not intended to limit the scope of the utility model. Those skilled in the art should understand that the above examples can be modified without departing from the scope and spirit of the utility model. The protection scope of the utility model is defined by the appended claims.

Claims

1. A spatial light distribution measuring device for measuring the spatial light distribution of a light-emitting body (6) under test, characterized in that: The device includes a substrate (4) with several holes, an imaging lens (1), and a photodetector (3). The holes are arranged at intervals on the substrate (4) and filled with a diffuser (5). The light source (6) to be tested is set on one side of the substrate (4), and the imaging lens (1) and the photodetector (3) are set on the other side of the substrate (4). The light emitted by the light source (6) to be tested shines on the substrate (4) and is diffused by the diffuser (5) to produce diffused light. The imaging lens (1) images the substrate (4) onto the photodetector (3) to obtain the image of each hole on the substrate (4).

2. The spatial light distribution measurement device according to claim 1, characterized in that, It also includes a light-shielding component (8), which is coupled to the substrate (4); the light-shielding component (8) is provided with a sampling port (2), the light-emitting body (6) to be tested is placed at the sampling port (2), and the light emitted by the light-emitting body (6) to be tested is irradiated onto the substrate (4) through the sampling port (2).

3. The spatial light distribution measurement device according to claim 2, characterized in that, The inner side of the light-shielding component (8) facing the substrate (4) is matte black.

4. The spatial light distribution measurement device according to claim 2, characterized in that, The substrate (4) is either curved or planar. When the substrate is curved, the sampling port (2) is located on the concave side of the substrate (4), and the imaging lens (1) and photodetector (3) are located on the concave side of the substrate (4).

5. A spatial light distribution measurement device according to claim 1 or 2, characterized in that, The diffuse filler (5) is composed of a matrix material with diffuse transmission properties; the matrix material includes resin, plastic or glue.

6. A spatial light distribution measurement device according to claim 1 or 2, characterized in that, The substrate (4) has a low-reflection material coating on its surface, or the substrate (4) is made of a low-reflection metal material.

7. The spatial light distribution measurement device according to claim 2, characterized in that, It also includes a sample stage (7), on which the light-emitting body (6) to be tested is placed. The position of the light-emitting body (6) to be tested is adjusted by moving the sample stage (7) so that the area to be tested of the light-emitting body (6) is placed at the sampling port (2).

8. The spatial light distribution measurement device according to claim 2, characterized in that, The center of the sampling port (2) is located on the geometric center axis of the substrate (4).

9. A spatial light distribution measurement device according to claim 1 or 2, characterized in that, The imaging lens (1) and photodetector (3) are two or more sets, respectively aimed at different areas of the measurement substrate (4); or it may also include a motion mechanism, the imaging lens (1) is set on the motion mechanism, and the imaging lens (1) moves relative to the substrate (4) through the motion mechanism to achieve measurement at different angles.

10. A spatial light distribution measurement device according to claim 1 or 2, characterized in that, The photodetector (3) includes an image sensor and an image processing unit. The image processing unit is communicatively connected to the image sensor. The image processing unit is used to process each pixel in the image generated by the image sensor to obtain the spatial light distribution of the light source (6) under test.

Images