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 photoelectric 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 limit 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 synchronously collecting multiple light signals, is located in lens barrel, and is used to receive the light beam from measured light source emitted from through hole;The photoelectric detector is located at the light outlet end 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 the rapid and accurate measurement of light distribution and light 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, aiming to solve the problems of low measurement efficiency and cumbersome operation of existing measurement devices, and to achieve rapid and accurate measurement of light distribution and illumination uniformity.

[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 a photodetector. The aperture plate is installed at the light-incident end of the lens barrel, and has two or more through holes. The through holes are used to define the sampling area of ​​the light source under test and to fix the optical fiber assembly, 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 barrel to transmit the light beam emitted from the light source under test from the through holes. The photodetector 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] This device adopts an integrated design. The perforated plate is directly mounted on the light-inlet end of the microscope tube, and the fiber optic assembly is located inside the microscope tube with its optical receiving surface adapted to the perforation distribution of the plate. During use, only the light-inlet end of the microscope tube needs to be aligned with the light source under test. Beam acquisition is completed through the pre-set fit between the perforated plate and the fiber optic assembly, eliminating the need for frequent adjustments to the relative positions of the components. The light-inlet end face of the fiber optic assembly is tightly coupled to the light-outlet side of the perforation (e.g., using epoxy resin adhesive). The beam emitted by the light source under test enters the fiber optic assembly through the perforations on the plate and is directionally transmitted to the photodetector, achieving efficient and accurate measurement of light distribution. The microscope tube can be made of metal, stainless steel, or high-strength engineering plastic to support and protect internal components and prevent stray light interference. The perforations on the plate precisely define the spatial range of the acquisition area, preventing stray light from non-target areas from entering, ensuring the accuracy of the sampling area, and the accuracy and comparability of the measurement results. The fiber optic assembly can be a single-channel fiber optic transmission component (i.e., a single fiber) or a multi-channel fiber optic transmission component (i.e., including two or more independent fibers), and the specific type can be selected according to actual testing requirements. For example, if a single optical fiber is used, its receiving surface at the light-incident end covers the light-outceasing area of ​​all through-holes. Optionally, the aperture plate and the light-incident end of the microscope tube can be detachably connected (e.g., threaded connection, snap-fit ​​connection, magnetic connection, etc.). The detachable design allows users to flexibly replace aperture plates with different through-hole arrangements (such as density, pattern) according to the size of the light source being measured and the area of ​​interest, improving the versatility and adaptability of the device and meeting various measurement needs in medical, industrial, and other fields. Preferably, the inner wall of the microscope tube is black or coated with a black coating to further avoid stray light interference.

[0007] 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, with the central angle between adjacent through holes being 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.

[0008] As a technical solution, the optical fiber assembly includes two or more optical fiber units; each optical fiber unit has a single independent optical transmission channel, and the light-inlet end of each optical fiber unit is correspondingly set with a through hole on the aperture plate (or in other words, the light-inlet end of each optical fiber unit passes through the through hole respectively), ensuring that the optical signal collected from a specific spatial position of the light source under test can be transmitted independently and without crosstalk to the photodetector through the optical transmission channel, 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 material) and two optical fiber interfaces, one of which is coupled to the through hole as the light-inlet end of the optical fiber unit, and the other optical fiber interface 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 assembly are integrated and fixed in 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) (such as a slot structure in 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.

[0009] As a technical solution, the photodetector consists of two or more detection units, and the spatial position of each detection unit corresponds one-to-one with the position of the light-emitting end of the optical fiber unit. There is no crosstalk between optical paths, meaning that a single detection unit only receives and measures the optical signal transmitted by a single optical fiber unit, thereby completing the synchronous and independent measurement of multiple optical signals and achieving rapid and accurate measurement of the light distribution of the light source under test in one operation. Specifically, the photosensitive central axis of each detection unit is collinear with the central axis of the light-emitting end of the corresponding optical fiber unit, and the photosensitive area of ​​each detection unit covers the effective light-emitting range of the light-emitting end of the corresponding optical fiber unit. A single measurement achieves the synchronous and independent measurement of multiple optical signals, and can simultaneously acquire optical parameter data from different sampling areas of the light source under test. The detection unit can be a photovoltaic cell, photodiode, CCD imaging detector, CMOS imaging detector, etc. The light-emitting end of the optical fiber unit can be arranged in the same way as the light-input end, or in a different way, such as linear arrangement, ring arrangement, rectangular arrangement, matrix arrangement, etc., depending on the actual measurement. The corresponding detector is also set according to the arrangement of the light-emitting end of the optical fiber unit.

[0010] As a technical solution, a switching mechanism is also included. The photodetector is mounted on the switching mechanism. The photodetector can be sequentially switched to the output end of each fiber unit by the switching mechanism in a time-sequence control manner to achieve measurement, thereby realizing efficient and automated measurement of the output light from all through holes. Preferably, the output ends of each fiber unit are coplanar. The switching mechanism can be a precision displacement stage or an electric slide stage, which can move along the plane where the output ends of each fiber assembly are located. Its drive end is fixedly connected to the photodetector. The switching mechanism can control the photodetector to move along the arrangement trajectory of the output end face of the fiber unit according to a preset time sequence, so that the detection unit of the photodetector is optically aligned with the output end of each fiber unit in sequence, completing the time-sequenced channel-by-channel measurement.

[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 pass through 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 epoxy resin adhesive). Specifically, the positioning plate is fixedly connected to the lens barrel by threads or a snap-fit ​​structure. The positioning plate has positioning holes that match the outer diameter of the fiber optic units. The light-emitting ends (fiber optic interfaces) of the fiber optic units are inserted one-to-one into the positioning holes of the positioning plate. The light-emitting ends of the fiber optic units are arranged on a single plane, providing a reference for the precise alignment of the switching mechanism.

[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 photodetector is one or a combination of two or more of the following: illuminance meter, radiometer, spectroradiometer, photometer, and luminance meter. When two or more combinations are used, multi-dimensional optical parameters such as illuminance, radiant flux, spectral distribution, and luminance can be measured.

[0014] As a technical solution, a lens is also included, which is disposed in the optical path between the light-emitting end of the fiber optic assembly and the photodetector. Further, the lens can be a single lens or a lens group composed of multiple lenses, and its function is to focus and / or collimate the light beam output from the fiber optic assembly. The fiber optic assembly can be coupled to the photosensitive surface of the photodetector through the lens. Preferably, two or more attenuators are provided in the optical path between the lens and the photodetector, which can improve the dynamic measurement range of the 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 communicates with the photodetector via wired (electrical wire) or wireless (Bluetooth, Wi-Fi) means. The data processing unit has a built-in conventional optical parameter calculation algorithm, receives the electrical signal output by the photodetector, converts it into corresponding parameters such as light intensity and illuminance, and calculates the illumination uniformity of the measured 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 value, etc.). It can also determine whether the illumination uniformity of the measured light source meets the requirements. Furthermore, the switching mechanism is communicatively connected to the data processing unit, which controls the switching mechanism to move the detection unit to different fiber optic units for measurement. The data processing unit also has a storage unit for storing fiber characteristics and detector responsivity parameters. When there are differences in fiber transmittance or detector responsivity, a known uniformly emitted 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.

[0017] As a technical solution, it also includes a display unit, which is communicatively connected to the data processing unit, such as by electrical connection or wireless communication connection, for real-time display of measured light parameters (such as illuminance values ​​at each point), illumination uniformity results and measurement status; the display unit is integrated with the lens barrel, or the display unit is a display panel independent of the lens barrel, such as an external dedicated display instrument or a display screen on a mobile smart terminal.

[0018] 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.

[0019] As a technical solution, a color filter is also provided in front of the photodetector to match its relative spectral responsivity with the human eye's optical efficiency function.

[0020] The beneficial effects of this invention are as follows: This invention provides a light distribution measurement device. By using a perforated plate with multiple through holes, it simultaneously samples and measures different areas of the surface of the light source or its emission port, enabling rapid and accurate measurement of light distribution, especially illumination uniformity. Combined with a three-dimensional translation stage and a data processing unit, it achieves 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 process. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the optical distribution measurement device in Embodiment 1.

[0022] Figure 2 This is a schematic diagram of the through-hole arrangement of the perforated plate in Embodiment 1.

[0023] Figure 3 This is a schematic diagram of the positioning holes on the positioning plate in Embodiment 1.

[0024] Figure 4 This is a schematic diagram of the optical fiber assembly output end in Embodiment 1.

[0025] Figure 5 This is a schematic diagram of the optical distribution measurement device in Embodiment 2.

[0026] Figure 6 This is a schematic diagram of the positioning hole arrangement of the positioning plate in Embodiment 2.

[0027] Figure 7 This is a schematic diagram of the connection of the optical fiber unit in Embodiment 2.

[0028] Figure 8 This is a schematic diagram of the structure of a light distribution measurement device in Embodiment 3.

[0029] Figure 9 This is a schematic diagram of the positioning hole arrangement of the positioning plate in embodiment 3.

[0030] Figure 10 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; 22-Fiber optic interface; 3-Switching mechanism; 4-Photodetector; 41-Detection unit; 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 barrel 1, an optical fiber assembly, a photodetector 4, a switching mechanism 3, a perforated plate 5, a positioning plate 10, and a data processing unit 7. The endoscope barrel 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 positioning plate 10 is located inside the endoscope barrel and is engaged with it. Its outer diameter is adapted to the inner diameter of the light-inlet end of the endoscope barrel 1, used to fix the light-outlet end of the optical fiber assembly. The perforated plate 5 is fixedly installed at the light-inlet end of the endoscope barrel 1, and its outer diameter is adapted to the inner diameter of the light-inlet end of the endoscope barrel 1 (gap ≤ 0.1 mm), used to fix the light-inlet end of the optical fiber assembly. The perforated plate 5 is made of aluminum alloy with a thickness of 2 mm and a black surface. It has 17 through holes 51, such as... Figure 2 As shown, the diameter of the aperture 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 aperture 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°), thus meeting the positioning requirements for the measurement position. The optical fiber assembly includes a single quartz optical fiber unit 21 with a length of 180 mm. The receiving surface of the optical fiber unit's light-receiving end covers the light-emitting area of ​​all through-holes 51, meaning that the light beams emitted from the light source 8 under test from all through-holes 51 simultaneously enter the single optical fiber unit 21. The fiber optic unit includes an optical fiber and two fiber optic interfaces. One fiber optic interface is bonded to the perforated plate with epoxy resin, serving as the light input end of the fiber optic unit; the other fiber optic interface is bonded to the positioning plate with epoxy resin, serving as the light output end of the fiber optic unit. The positioning plate 10 has a positioning hole 11 (5 mm in diameter). Figure 3 As shown, the positioning hole 11 is used to fix the light-emitting end of the optical fiber unit. It is coupled (tightly bonded) to the optical fiber interface. The diameter of the positioning hole 11 is 5 mm. Figure 4 The diagram shows the light-emitting end of the fiber optic assembly; optical signals are transmitted between the two fiber optic interfaces via fiber optic connection. The photodetector 4 is an illuminance probe, mounted on the switching mechanism 3. The switching mechanism 3, in a time-sequence control manner, moves the photodetector 4 along the arrangement trajectory of the light-emitting end face of the fiber optic unit, sequentially switching positions to measure the emitted beams of each fiber optic unit. The switching mechanism is a precision displacement stage. The data processing unit 7 is a computer, wirelessly connected to the photodetector. The data processing unit can calculate the illumination uniformity of the measured light source 8 based on the signal output by the photodetector 4, and can also determine whether the illumination uniformity of the measured light source meets the requirements. The measurement structure can be displayed on the computer. 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, a photodetector 4, a switching mechanism 3, an orifice plate 5, a positioning plate 10, and a data processing unit 7. The lens barrel 1 is made of stainless steel with a wall thickness of 0.8 mm and a black inner wall, serving as structural support and component fixation. The orifice plate 5 is fixedly installed at the light-incident end of the lens barrel 1, and its outer diameter matches the inner diameter of the light-incident end of the lens barrel 1 (gap ≤ 0.1 mm). The orifice plate 5 is made of aluminum alloy with a thickness of 1.5 mm and a black surface, and has 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 light-emitting surface size of the cold light source of the medical endoscope, thus meeting the positioning requirements for the measurement position. The positioning plate 10 is located inside the endoscope tube at the light-emitting end of the fiber optic unit. The positioning plate 10 has 17 positioning holes 11 for fixing the light-emitting end of the fiber optic assembly. The positioning holes 11 are arranged in a one-dimensional linear pattern, as shown... Figure 6 As shown. The fiber optic assembly includes 17 visible light fiber units 21 (glass material), each 150 mm in length, with an incident light-incident surface diameter of 0.4 mm and a numerical aperture of 0.50. The central axis of each fiber unit 21 is perpendicular to its end face. Within the wavelength range of 380 nm to 780 nm, the relative spectral transmittance flatness is no greater than ±10%. Each fiber unit includes an optical fiber and two fiber optic interfaces 22. One fiber optic interface is tightly connected to a through-hole, serving as the incident light end of the fiber unit, while the other fiber optic interface serves as the emitting light end. The emitting light ends of each fiber unit are respectively located within positioning holes 11. The two fiber optic interfaces are connected via optical fibers to transmit optical signals, such as... Figure 7As shown. In this embodiment, the light-incident ends of 17 fiber optic units 21 are fixed to the through holes 51 of the perforated plate 5 with epoxy resin. The fiber optic units 21 and the through holes 51 are coaxially arranged in a one-to-one correspondence, and the end face of the light-incident end of the fiber optic unit 21 is tightly fitted to the light-emitting surface of the perforated plate 5 (gap ≤ 0.02 mm), ensuring that the light beam entering the through hole 51 can be completely coupled into the fiber optic unit 21; the light-emitting ends of the 17 fiber optic units 21 are fixed to the positioning holes 11 of the positioning plate 10 with epoxy resin. The photodetector 4 is a photometer, which is set on the switching mechanism 3. The switching mechanism 3 switches the photodetector 4 to the light-emitting end of each fiber optic unit 21 in sequence to realize the measurement. The switching mechanism is a precision displacement stage. The data processing unit 7 is a computer, which is wirelessly connected to the photodetector. The data processing unit can calculate the illumination uniformity of the light source 8 under test based on the signal output by the photodetector 4, and can also determine whether the illumination uniformity of the light source under test meets the requirements. Example 3

[0035] like Figure 8 As shown, this embodiment provides a light distribution measurement device, mainly including a lens barrel 1, an optical fiber assembly, a photodetector 4, an aperture plate 5, a display unit 9, a positioning plate 10, 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 inner wall, serving as structural support and component fixation. The aperture plate 5 is fixedly installed at the light-incident end of the lens barrel 1, and its outer diameter matches the inner diameter of the light-incident end of the lens barrel 1. The aperture plate 5 is made of aluminum alloy with a thickness of 2 mm and a black surface, and has 17 through holes 51 on it, 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). With the center of the perforated plate 5 as the origin, a through hole with a diameter of 0.4 mm is opened at the center. Eight through holes with a diameter of 0.4 mm are evenly distributed on a circle with a radius of 1.15 mm, and eight through holes with a diameter of 0.4 mm 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 light-emitting surface size of the cold light source of the medical endoscope, thus meeting the positioning requirements of the measurement position. The arrangement of the positioning holes 11 on the positioning plate 10 is consistent with the arrangement of the through holes 51 on the perforated plate 5, as shown... Figure 9As shown. The fiber optic assembly includes 17 glass fiber units 21, each 150 mm in length, with an incident light-incident surface diameter of 0.4 mm and a numerical aperture of 0.50. The central axis of each fiber unit 21 is perpendicular to its end face. Within the wavelength range of 380 nm to 780 nm, the relative spectral transmittance flatness is no greater than ±10%. Each fiber unit contains an optical fiber and two fiber optic interfaces 22. One interface is tightly connected to a through-hole, serving as the incident light-incident end of the fiber unit, while the other interface serves as the emitting light-incident end. The emitting ends of each fiber unit are fixed inside the lens barrel via positioning holes on a positioning plate. The two fiber optic interfaces are connected by an optical fiber to transmit optical signals, such as... Figure 10 As shown. In this embodiment, the light-incident ends of the 17 optical fiber units 21 are fixed to the through holes 51 of the perforated plate 5 with epoxy resin. The optical fiber units 21 and the through holes 51 are coaxially arranged in a one-to-one correspondence, and the end face of the light-incident end of the optical fiber unit 21 is in close contact with the light-emitting surface of the perforated plate 5 (gap ≤ 0.02 mm), ensuring that the light beam entering the through hole 51 can be completely coupled into the optical fiber unit 21. The photodetector 4 includes 17 detection units 41, which are silicon photodiodes. Their spatial positions correspond one-to-one with the light-emitting ends of the optical fiber units. Each detection unit receives only the optical signal transmitted by a single optical fiber unit, thereby completing the synchronous and independent measurement of multiple optical signals. The photodetector 4 and 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 17 light intensity distribution data points output by the detection unit 41, it calculates the illumination uniformity of the measured light source according to the relative standard deviation formula, determines whether it meets the illumination uniformity requirements in the standard, and transmits the measurement results to the display unit 9. The display unit 9 is integrated with the lens barrel. The data processing unit also has a storage unit for storing fiber characteristics and detector responsivity parameters. When there are differences in fiber transmittance or detector responsivity, a known uniformly emitted 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. The entire light distribution measurement device is fixed on a 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.

[0036] In the above embodiments, the through holes 51 on the perforated plate 5 can also be set into other shapes such as rectangles, rings or arcs according to the measurement requirements or the shape and size of the light outlet of the light source 8 being measured, so as to adapt to the measurement of different light source products.

[0037] 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 a photodetector (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 (8) under test, so that the light beam emitted by the light source (8) under test 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 (8) under test through the through holes (51). The photodetector (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, 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.

3. 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); the light-inlet end of each optical fiber unit (21) is set in a one-to-one correspondence with the through hole (51) on the perforated plate (5).

4. The light distribution measurement device according to claim 3, characterized in that, The photodetector (4) consists of two or more detection units (41), and the spatial position of each detection unit (41) corresponds one-to-one with the light output position of the optical fiber unit (21). Each detection unit receives only the optical signal transmitted by a single optical fiber unit, thereby completing the synchronous independent measurement of multiple optical signals.

5. The light distribution measurement device according to claim 3, characterized in that, It also includes a switching mechanism (3), on which the photodetector (4) is mounted. The switching mechanism (3) switches the photodetector (4) sequentially to the light output end of each fiber unit (21) according to the timing control method.

6. The light distribution measurement device according to claim 3, characterized in that, The lens tube (1) is also provided with a positioning plate (10) for fixing the light-emitting end of each optical fiber unit. The positioning plate is provided with a positioning hole (11), and the light-emitting end of each optical fiber unit is respectively inserted into the positioning hole (11).

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

8. A light distribution measurement device according to claim 1 or 2, characterized in that, The photodetector (4) is one or more of the following: illuminance meter, radiometer, and spectroradiometer.

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

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

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