A light distribution measuring device

Abstract

The utility model provides a kind of light distribution measuring device, including lens barrel, optical fiber assembly, aperture plate and array detector;The aperture plate is installed in the light inlet end of lens barrel, and two or more through holes are provided on aperture plate, the through hole is used to define the sampling area of measured light source, so that the light beam emitted by measured light source only passes through through hole and enters the optical fiber assembly inside lens barrel;The optical fiber assembly is the light transmission component for synchronous acquisition of multiple light signals, is located in lens, for transmitting the light beam from measured light source emitted from through hole;Array detector is located at the light exit side of optical fiber assembly, for receiving and measuring the emergent light of optical fiber assembly.The utility model aims at solving the problems of low measuring efficiency and complicated operation of existing measuring device, and realizes rapid and accurate measurement of light distribution, especially illumination uniformity.

Description

Technical Field

[0001] This utility model relates to the field of optical radiation measurement, and specifically to a light distribution measurement device. Background Technology

[0002] In numerous fields such as medical lighting, classroom lighting, industrial inspection, and road lighting, the performance indicators of light source products, such as light radiation distribution and illumination uniformity, directly affect application effectiveness and operational safety. Taking medical cold light sources, widely used in the medical field, as an example, their illumination uniformity directly affects the clarity of the surgical field. Uneven illumination may lead to shadows or differences in brightness in the surgical area, thereby increasing surgical risks and affecting surgical outcomes. Therefore, it is necessary to accurately detect the light distribution information of light sources throughout the entire lifecycle of light source products, including research and development, production quality inspection, and factory acceptance, to ensure product quality.

[0003] Currently, most common methods for measuring the light distribution at the output port of cold light sources rely on point-by-point scanning with a single-aperture optical fiber. This requires frequent switching of measurement points, resulting in cumbersome procedures, low measurement efficiency, and difficulty in quickly and comprehensively acquiring light distribution data for the entire illumination area, thus failing to meet the rapid measurement needs of practical applications. Therefore, there is an urgent need for a device that can achieve rapid and accurate light distribution measurement. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a light distribution measurement device, which aims to solve the problems of low measurement efficiency and cumbersome operation of existing measurement devices, and to achieve rapid and accurate measurement of the light distribution and illumination uniformity of the light source being measured.

[0005] To achieve the above objectives, this utility model provides a light distribution measurement device, including a lens barrel, an optical fiber assembly, an aperture plate, and an array detector. The aperture plate is installed at the light-incident end of the lens barrel, and two or more through holes are formed on the aperture plate. The through holes are used to define the sampling area of ​​the light source under test, so that the light beam emitted by the light source under test enters the optical fiber assembly inside the lens barrel only through the through holes. The optical fiber assembly is an optical transmission component for synchronously acquiring multiple optical signals, and is located inside the lens to transmit the light beam emitted from the light source under test from the through holes. The array detector is located on the light-emitting side of the optical fiber assembly and is used to receive and measure the emitted light from the optical fiber assembly.

[0006] In the above technical solution, the lens barrel can be made of metal, stainless steel, or high-strength engineering plastic to support and protect internal components and avoid stray light interference. The optical fiber assembly is an optical transmission component for synchronously acquiring multiple optical signals. The light-incident end face of the optical fiber assembly is tightly coupled to the light-outcident side of the through-hole (e.g., using epoxy resin adhesive for fixation). The optical fiber assembly synchronously acquires the light radiation from different regions of the light source under test. The optical signal output by the optical fiber assembly is directly projected to the array detector or imaged to the array detector through a lens, thereby converting the light distribution information into a synchronously measurable electrical signal. This structure enables parallel measurement of multiple regions of the light source, significantly improving measurement efficiency and the consistency of measurement data. The optical fiber assembly can be a single-channel optical fiber transmission component (i.e., a single optical fiber) or a multi-channel optical fiber transmission component (i.e., including two or more independent optical fibers). The specific type can be selected according to actual testing requirements. Preferably, the inner wall of the lens barrel is black or coated with a black coating to avoid stray light interference. The array detector can be a one-dimensional array detector or a two-dimensional array detector. Specifically, it can be a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS) type, such as a one-dimensional array CCD or a two-dimensional array CMOS.

[0007] Furthermore, the aperture plate and the light-inlet end of the lens barrel are detachably connected (e.g., threaded connection, snap-fit ​​connection, magnetic connection, etc.). This detachable design allows users to flexibly replace aperture plates with different through-hole arrangements (e.g., density, pattern) according to the size of the light source being measured and the area of ​​interest, greatly enhancing the versatility and adaptability of the device. For example, if a single optical fiber is used, the receiving surface at its light-inlet end covers the light-outlet area of ​​all through-holes.

[0008] As a technical solution, the system also includes a lens disposed in the optical path between the fiber optic assembly and the array detector, for imaging the light beam emitted from the fiber optic assembly onto the photosensitive surface of the array detector. Further, the lens can be a single lens or a lens group composed of multiple lenses, its function being to focus and / or collimate the light beam output from the fiber optic assembly, imaging the light beam emitted from the fiber optic assembly onto the photosensitive surface of the array detector.

[0009] As a technical solution, a through hole is formed at the center of the orifice plate. Two or more through holes are evenly distributed on the circumference at a first distance from the center of the orifice plate, and two or more through holes are evenly distributed on the circumference at a second distance from the center of the orifice plate. The first distance and the second distance are different. In a specific embodiment, eight through holes are evenly distributed on each circumference, and the central angle between adjacent through holes on the circumference is 45°. The first distance is 2.3 mm, and the second distance is 4.6 mm, which matches the measurement position of the cold light source of the medical endoscope. The orifice plate through hole design meets the positioning requirements of the measurement position.

[0010] As a technical solution, the optical fiber assembly includes two or more optical fiber units, each with a single independent optical transmission channel. The light-inlet end of each optical fiber unit corresponds one-to-one with the through-holes on the aperture plate (or, in other words, the light-inlet end of each optical fiber unit passes through the through-holes respectively), ensuring that the optical signal collected from a specific spatial location of the light source under test can be transmitted independently and without crosstalk to the array detector through the optical transmission channel, thus ensuring the accuracy of the measurement results. To ensure uniform measurement accuracy, the optical performance of each optical fiber unit is the same, such as numerical aperture, transmittance, etc., being the same or within the tolerance range. Specifically, each optical fiber unit includes one optical fiber (quartz or glass) and two optical fiber interfaces. One optical fiber interface is coupled to the through-hole (e.g., bonded with epoxy resin) as the light-inlet end of the optical fiber unit, and the other optical fiber interface serves as the light-outlet end of the optical fiber unit. The two optical fiber interfaces are connected by an optical fiber to transmit the optical signal. Preferably, all fiber units in the fiber optic assembly are integrated and fixed within the lens barrel according to a specific spatial pattern (such as a rectangular array or a ring array adapted to the shape of the light outlet of the light source under test) (e.g., a slot structure within the lens barrel, epoxy resin bonding, welding, etc.), and the light-incident end face of each fiber unit is tightly fitted to the light-outceasing side of the through-hole. Preferably, the light-outceasing ends of each fiber unit are coplanar.

[0011] As a technical solution, the lens barrel is further provided with a positioning plate for fixing the light-emitting ends of each fiber optic unit. The positioning plate has positioning holes, the number of which is consistent with the number of fiber optic units and the number of through holes. The light-emitting ends of each fiber optic unit are respectively inserted into the positioning holes (or, in other words, the light-emitting ends of each fiber optic unit are coupled and connected to the positioning holes, for example, by using epoxy resin adhesive for fixation). Specifically, the positioning plate is fixedly connected to the lens barrel by threads, snap-fit ​​structures, or welding. The positioning plate has positioning holes that are adapted to the outer diameter of the light-emitting ends of the fiber optic units. The light-emitting ends (i.e., fiber optic interfaces) of the fiber optic units are respectively inserted into the positioning holes of the positioning plate, and the light-emitting ends of the fiber optic units are arranged on a plane.

[0012] As a technical solution, the arrangement and / or size of the positioning holes are not the same as the through holes on the perforated plate. That is, they can be arranged in a linear or array arrangement, or in a circular or square shape, depending on the actual measurement convenience or the structural requirements of the device.

[0013] As a technical solution, the lens includes a first lens and a second lens, which are disposed in the optical path between the light-emitting end of the fiber optic assembly and the array detector. The light-emitting ends of each fiber optic unit are arranged on a plane. The light beam emitted from the fiber optic unit is converted into parallel light by the first lens, and then focused by the second lens to form N light spots on the photosensitive surface of the array detector. This technical solution uses the first lens to collimate the light beam emitted from each fiber optic unit into parallel light, and then uses the second lens to converge the parallel light onto the array detector, so that the light-emitting end of each fiber optic unit forms a clear and discrete light spot on the target surface of the array detector. This achieves synchronous imaging and detection of multiple optical signals, simplifies the system structure, and reduces costs. Furthermore, by utilizing mature image processing technology, the brightness information of all light spots can be obtained with high precision, resulting in fast measurement speed and high accuracy. Preferably, the first lens and the second lens constitute a 4f imaging system with a magnification ratio of 1:1, ensuring that the optical end face of the fiber optic unit and the photosensitive surface of the array detector form object-image conjugate, achieving distortion-free imaging of the light spots.

[0014] As a technical solution, several attenuators are also provided in the measurement optical path. Preferably, two or more attenuators are provided in the optical path between the lens and the array detector, which can improve the dynamic measurement range of the array detector, adapt to complex light intensity scenarios, and meet the measurement and analysis of different levels of light.

[0015] As a technical solution, a three-dimensional translation stage is also included. The light distribution measurement device is mounted on the three-dimensional translation stage, and the positioning or switching of the light source under test is achieved by moving the three-dimensional translation stage. Specifically, the lens barrel is connected to the moving platform of the three-dimensional translation stage through a fixed base, so that the entire light distribution measurement device can move with the three-dimensional translation stage in the X, Y, and Z directions, achieving precise alignment with light sources under test of different sizes and positions, or completing scanning measurements of different areas of the light source under test.

[0016] As a technical solution, it also includes a data processing unit, which is communicatively connected to the array detector. The data processing unit incorporates a conventional optical parameter calculation algorithm, receives and processes the electrical signals output by the array detector, converts them into corresponding parameters such as light intensity and illuminance, and calculates the illumination uniformity of the tested light source based on these parameters (e.g., calculating the relative standard deviation of parameters at each measurement point, the ratio of minimum to maximum values, etc.). It can also determine whether the illumination uniformity of the tested light source meets the requirements. Specifically, the array detector transmits the received spot image to the data processing unit. The data processing unit adds and averages the signals of all pixels covered by each spot in the spot image to obtain the original average signal intensity corresponding to each spot. It then subtracts the corresponding background average signal intensity from the original average signal intensity corresponding to each spot to obtain the average output light power corresponding to each aperture. The illumination uniformity of the tested light source is calculated according to the relative standard deviation formula, and further, it is determined whether the illumination uniformity of the tested light source meets the requirements.

[0017] As a technical solution, the data processing unit also has a storage unit for storing fiber characteristics and array detector responsivity parameters; when there are differences in fiber transmittance or array detector responsivity, a known uniform light-emitting surface light source is used to calibrate the light distribution device, determine the correction coefficients for each channel, and save them to the storage unit.

[0018] As a technical solution, a display unit is also included. This display unit is communicatively connected to the data processing unit, for example, via electrical or wireless communication. It can display measured light parameters (such as illuminance values ​​at various points), illumination uniformity results, and measurement status in real time, or provide external interactive instructions. Specifically, the display unit can be a display panel independent of the lens barrel, such as an external dedicated display instrument or a display screen on a mobile smart terminal; alternatively, the display unit can be integrated with the lens barrel. This integration allows for closer collaboration between components, reduces connection lines and interfaces, lowers system complexity and cost, and improves overall system performance.

[0019] As a technical solution, the through holes on the orifice plate are set to be rectangular, annular, or arc-shaped according to the shape of the light source or light outlet of the light source being measured, thus adapting to the measurement of different types of light sources. The diameter of the through holes and the spacing between adjacent through holes can be adjusted according to the measurement accuracy requirements. The through holes are evenly distributed on the orifice plate to ensure that the sampling area covers the effective light emission range of the light source being measured.

[0020] As a technical solution, a color filter is also provided in front of the array detector to match the relative spectral responsivity of each pixel in the array detector with the human eye's light efficiency function. Specifically, an XYZ color filter is provided in front of the array detector, which is adapted to the 380nm-780nm visible light band, so that the relative spectral responsivity of each pixel in the array detector can match the human eye's light efficiency function V(λ).

[0021] The beneficial effects of this invention are as follows: This invention provides a light distribution measurement device. By using multiple fiber optic units or a perforated plate with multiple through holes to simultaneously sample and measure different areas of the surface or light outlet of the light source under test, it can achieve rapid and accurate measurement of light distribution, especially illumination uniformity. Combined with a three-dimensional translation stage and a data processing unit, it can achieve automated switching measurement of the light source and automatic calculation and judgment of parameters such as illumination uniformity, greatly improving the level of automation and objectivity of the detection. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the optical distribution measurement device in Embodiment 1.

[0023] Figure 2 This is a schematic diagram of the through-hole arrangement of the perforated plate in Embodiment 1.

[0024] Figure 3 This is a schematic diagram of the positioning holes on the positioning plate in Embodiment 1.

[0025] Figure 4 This is a schematic diagram of the array detector measurement in Embodiment 1.

[0026] Figure 5 This is a schematic diagram of the optical distribution measurement device in Embodiment 2.

[0027] Figure 6 This is a schematic diagram of the positioning hole arrangement of the positioning plate in Embodiment 2.

[0028] Figure 7 This is a schematic diagram of the connection of the optical fiber unit in Embodiment 2.

[0029] Figure 8 This is a schematic diagram of the optical distribution measurement device in Embodiment 3.

[0030] Figure 9 This is a schematic diagram of the connection of the optical fiber unit in embodiment 3.

[0031] Explanation of reference numerals in the attached figures: 1-Mirror tube; 2-Fiber optic assembly; 21-Fiber optic unit; 3-Lens; 31-First lens; 32-Second lens; 4-Array detector; 5-Orifice plate; 51-Through hole; 6-Three-dimensional translation stage; 7-Data processing unit; 8-Light source under test; 9-Display unit; 10-Positioning plate; 11-Positioning hole. Detailed Implementation

[0032] The present invention will be further described below with reference to the embodiments, but the present invention is not limited to the following embodiments. Example 1

[0033] like Figure 1 As shown, this embodiment provides a light distribution measurement device, mainly used for detecting the uniformity of cold light source illumination in medical endoscopes. The measurement device mainly includes an endoscope tube 1, an optical fiber assembly 2, an array detector 4, a perforated plate 5, a positioning plate 10, and a data processing unit 7. The endoscope tube 1 is made of stainless steel with a wall thickness of 1 mm and a black inner wall, serving as structural support and component fixation. The perforated plate 5 is fixedly installed at the light-incident end of the endoscope tube 1, and its outer diameter is adapted to the inner diameter of the light-incident end of the endoscope tube 1 (gap ≤ 0.1 mm). The perforated plate 5 is made of aluminum alloy with a thickness of 2 mm and a black surface, and has a total of 17 through holes 51, such as... Figure 2 As shown, the diameter of the perforated plate 5 is 6 mm (the effective light-receiving surface diameter is 5 mm). A 0.4 mm diameter through-hole is opened at the center of the perforated plate 5, with the center as the origin. Eight 0.4 mm diameter through-holes are evenly distributed on a circle with a radius of 1.15 mm, and eight 0.4 mm diameter through-holes are evenly distributed on a circle with a radius of 2.3 mm (the central angle of adjacent through-holes is 45°). This matches the size of the light-emitting surface of the cold light source of the medical endoscope, thus meeting the positioning requirements of the measurement position and fixing the light-inlet end of the fiber optic assembly. The positioning plate 10 is located inside the endoscope tube and has a positioning hole 11 (5.1 mm diameter) for fixing the light-emitting end of the fiber optic assembly, such as... Figure 3 As shown. The fiber optic assembly 2 includes a single quartz fiber unit with a length of 180 mm. The receiving surface of the fiber unit's light-inlet end covers the light-outlet area of ​​all through-holes 51, meaning that the light beams emitted from the light source 8 under test emanating from all through-holes 51 simultaneously enter the single fiber unit 21. The fiber unit includes an optical fiber and two optical fiber interfaces. One optical fiber interface is coupled to the aperture plate 5 (bonded with epoxy resin) and serves as the light-inlet end of the fiber unit. The other optical fiber interface serves as the light-outlet end of the fiber unit, passing through the positioning hole of the positioning plate and coupled to the positioning hole (bonded with epoxy resin). The two optical fiber interfaces are connected by an optical fiber to transmit optical signals. The light beam emitted from the light source under test enters the optical fiber inside the lens barrel through the through-hole and is projected onto the photosensitive surface of the array detector 4 to form 17 light spots, as shown. Figure 4As shown. The array detector 4 uses a 1024×1024 pixel two-dimensional CCD detector with a photosensitive surface size of 5.6 mm × 5.6 mm. A color filter (model XYZ filter) matching the visible light band is placed in front of it, so that the relative spectral responsivity of each pixel of the array detector is related to the human eye's light efficiency function V(…). λ Matching. The array detector 4 is wirelessly connected to the data processing unit 7, which is a computer. After receiving the light intensity distribution data of the 17 light spots output by the array detector 4, it first extracts the average light intensity value of each light spot, and then calculates the ratio of the minimum to the maximum value among the 17 average light intensity values. This ratio is the illumination uniformity (expressed as a percentage), and automatically determines whether it meets the illumination uniformity requirements in the YY 1081-2011 standard "Medical Endoscope Cold Light Source". Example 2

[0034] like Figure 5 As shown, this embodiment provides a light distribution measurement device, mainly including a lens barrel 1, an optical fiber assembly 2, a lens 3, an array detector 4, an aperture plate 5, a positioning plate 10, a display unit 9, and a data processing unit 7. The lens barrel 1 is made of metal with a wall thickness of 0.8 mm and a black coating on the inner wall. The positioning plate 10 is located inside the lens barrel on the light-emitting side of the optical fiber unit. The positioning plate 10 has 17 positioning holes 11 for fixing the light-emitting end of the optical fiber assembly. The positioning holes 11 are arranged in a one-dimensional linear pattern, such as... Figure 6 As shown. The perforated plate 5 is detachably mounted on the light-incident end of the lens barrel 1 via threads, and its outer diameter matches the inner diameter of the light-incident end of the lens barrel 1. The perforated plate 5 is made of aluminum alloy, with a thickness of 1 mm and a black surface. It has a total of 17 through holes 51, as shown. Figure 2As shown, the diameter of the perforated plate 5 is 6 mm (the effective light-receiving surface diameter is 5 mm). A 0.4 mm diameter through-hole is opened at the center of the perforated plate 5, with the center as the origin. Eight 0.4 mm diameter through-holes are evenly distributed on a circle with a radius of 1.15 mm, and eight 0.4 mm diameter through-holes are evenly distributed on a circle with a radius of 2.3 mm (the central angle of adjacent through-holes is 45°), matching the light-emitting surface size of the medical endoscope's cold light source. The fiber optic assembly 2 includes 17 visible light fiber units 21 (glass material), each 150 mm in length, with a light-receiving surface diameter of 0.4 mm and a numerical aperture of 0.50. The central axis of the fiber unit 21 is perpendicular to its end face. Within the wavelength range of 380 nm-780 nm, the relative spectral transmittance flatness is no greater than ±10%. The light-inlet ends of 17 fiber optic units 21 are fixed to the through holes 51 of the perforated plate 5 with epoxy resin. Each fiber optic unit 21 is coaxially aligned with one through hole 51, and the end face of the light-inlet end of each fiber optic unit 21 is tightly fitted to the light-outlet surface of the perforated plate 5 (gap ≤ 0.02 mm), ensuring that all light beams entering the through holes 51 can be coupled into the fiber optic unit 21. The light-outlet ends of the 17 fiber optic units 21 are fixed to the positioning holes of the positioning plate with epoxy resin, and the end faces of the light-outlet ends of each fiber optic unit 21 are coplanar. Optical signals are transmitted between the light-inlet and light-outlet ends of the fiber optic assembly via optical fiber connections, such as... Figure 7 As shown. The lens 3 is used to convert the light beam emitted from the fiber unit 21 into parallel light, thus acting as a collimator. Two attenuators are also present in the optical path between the lens 3 and the array detector 4. The array detector 4 is a one-dimensional linear array CCD detector, whose pixel parameters are matched to the size and measurement accuracy requirements of the light spot emitted from the fiber. The array detector 4 and the display unit 9 are electrically connected to the data processing unit 7. The data processing unit 7 is an embedded microprocessor (which pre-stores the illumination uniformity calculation model specified in the YY1081-2011 standard). After receiving the light intensity distribution data of the 17 light spots output by the array detector 4, it first extracts the average light intensity value of each light spot, then calculates the ratio of the minimum to the maximum value among the 17 average light intensity values. This ratio represents the illumination uniformity (expressed as a percentage). It determines whether the illumination uniformity requirements in the standard are met and transmits the measurement results to the display unit 9. The display unit is an independent display panel that can display the measurement data in real time.

[0035] During measurement, the light-emitting surface of the light source 8 and the light-incident surface of the aperture plate 5 are positioned directly opposite each other (5 mm apart). The light beam emitted by the light source 8 passes through the 17 through holes 51 of the aperture plate 5 to form 17 detection beams, which are then coupled into the corresponding fiber optic units 21. After transmission through the fiber optic units 21, the beams are collimated by the lens 3 and attenuated by the attenuator before forming 17 clear light spots on the photosensitive surface of the array detector 4. The data processing unit 7 collects the light intensity data of the light spots in real time and calculates the illumination uniformity. Finally, the measurement results (including uniformity values, light spot distribution images, and qualification / disqualification) are output through the display unit 9. This embodiment can achieve high-precision detection of the illumination uniformity of cold light sources in medical endoscopes, and the device has a compact structure, making it suitable for rapid on-site measurement in medical device testing scenarios. Example 3

[0036] Based on Embodiments 1 and 2, this embodiment adds a three-dimensional translation stage 6, such as... Figure 8 As shown. The entire measuring device is fixed on the three-dimensional translation stage 6, and its movement can be controlled by a program to achieve the positioning or switching of the measured light source. The lens 3 includes a first lens 31 and a second lens 32, forming an imaging optical system: the first lens 31 and the second lens 32 are cemented doublet lenses. The light beam emitted from the fiber unit is converted into parallel light by the first lens 31, and then focused onto the photosensitive surface of the array detector 4 by the second lens 32. The array detector 4 adopts a 1024×1024 pixel CMOS detector, and a color filter (model XYZ color filter) matching the visible light band is provided in front of it, so that the relative spectral responsivity of each pixel of the array detector is related to the human eye's light efficiency function V ( λ Matching. The data processing unit 7 also integrates a storage unit for storing fiber characteristic parameters and detector responsivity parameters. When there are differences in fiber transmittance or array detector responsivity, a surface light source with known uniform light output can be used to calibrate this light distribution measurement device to determine the correction coefficients corresponding to each channel, and these coefficients are saved to the storage unit.

[0037] The display unit 9 is integrated with the lens barrel. The through holes on the perforated plate 5 can also be rectangular, annular, or arc-shaped according to measurement requirements or the shape and size of the light outlet of the light source 8 being measured. The arrangement of the positioning holes on the positioning plate can be consistent with the arrangement of the through holes on the perforated plate, such as... Figure 9 As shown, the settings can also be different, i.e., based on actual measurements. The data processing unit 7 has a built-in algorithm that can calculate the variance, standard deviation, or uniformity index of the illuminance at each point. When the calculated value exceeds a preset threshold, the uniformity of the light source can be determined to be unqualified.

[0038] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A light distribution measurement device, characterized in that, The system includes a lens barrel (1), an optical fiber assembly (2), an aperture plate (5), and an array detector (4). The aperture plate (5) is installed at the light-inlet end of the lens barrel (1). The aperture plate (5) has two or more through holes (51). The through holes (51) are used to define the sampling area of ​​the light source under test (8) so that the light beam emitted by the light source under test (8) enters the optical fiber assembly (2) inside the lens barrel (1) only through the through holes (51). The optical fiber assembly (2) is an optical transmission component used to synchronously collect multiple optical signals and is used to transmit the light beam emitted from the light source under test (8) through the through holes (51). The array detector (4) is located on the light-outlet side of the optical fiber assembly (2) and is used to receive and measure the emitted light of the optical fiber assembly (2).

2. The light distribution measurement device according to claim 1, characterized in that, It also includes a lens (3), which is disposed in the optical path between the fiber optic assembly (2) and the array detector (4) for imaging the light beam emitted from the fiber optic assembly onto the photosensitive surface of the array detector (4).

3. A light distribution measurement device according to claim 1 or 2, characterized in that, A through hole (51) is opened at the center of the perforated plate (5). Two or more through holes (51) are evenly distributed on the circumference at a first distance from the center of the perforated plate (5). Two or more through holes (51) are evenly distributed on the circumference at a second distance from the center of the perforated plate (5). The first distance and the second distance are different distances.

4. A light distribution measurement device according to claim 1 or 2, characterized in that, The optical fiber assembly (2) includes two or more optical fiber units (21), each optical fiber unit (21) is fixedly disposed inside the lens barrel (1); the light-inlet end of each optical fiber unit (21) is configured to correspond one-to-one with the through hole (51) on the aperture plate (5).

5. The light distribution measurement device according to claim 4, characterized in that, The lens tube (1) is also provided with a positioning plate (10) for fixing the light output end of each optical fiber unit. The positioning plate (10) is provided with a positioning hole (11), and the light output end of each optical fiber unit is respectively inserted into the positioning hole (11).

6. The light distribution measurement device according to claim 5, characterized in that, The arrangement and / or size of the positioning holes (11) are inconsistent with those of the through holes (51).

7. The light distribution measuring device according to claim 4, characterized in that, The lens (3) includes a first lens (31) and a second lens (32); the light-emitting ends of each fiber unit (21) are arranged on a plane. The light beam emitted from the fiber unit is converted into parallel light by the first lens (31), and then focused by the second lens (32) to form N light spots on the photosensitive surface of the array detector (4).

8. A light distribution measurement device according to claim 1 or 2, characterized in that, It also includes a data processing unit (7), which is communicatively connected to the array detector (4); the data processing unit (7) receives and processes the signals output by the array detector (4).

9. The light distribution measuring device according to claim 8, characterized in that, The data processing unit also includes a storage unit for storing fiber characteristics and array detector responsivity parameters. When there are differences in fiber transmittance or array detector responsivity, a surface light source with known uniform light output is used to calibrate the light distribution device, determine the correction coefficients for each channel, and save them to the storage unit.

10. The light distribution measuring device according to claim 8, characterized in that, It also includes a display unit (9), which is communicatively connected to the data processing unit (7); the display unit (9) is integrated with the lens barrel, or the display unit (9) is a display panel independent of the lens barrel.

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