A laser radar optical assembly detection tool

Abstract

The present application relates to the field of laser radar detection, and in particular to a laser radar optical assembly detection tool. The present application includes a base, a bracket, a detection adjustment structure, and a background plate. The bracket and the background plate are arranged on the base and the distance between them is adjustable. The detection adjustment structure is arranged on the bracket, and is used to set the optical assembly to be tested and the detection circuit board. The detection circuit board includes a light source, and the light source is located at the focus of the optical assembly to be tested. The light source emits light through the optical assembly to be tested and irradiates the background plate. In the embodiment of the present application, the light source on the detection circuit board is imaged on the background plate at a corresponding distance through the optical assembly to be tested. When the lens or structural parts in the optical assembly to be tested change or are not precisely assembled, resulting in the optical system being out of focus, the image on the background plate will change accordingly, thereby effectively detecting the optical assembly to be tested whose components have been changed or assembled unqualifiedly.

Description

Technical Field

[0001] The present invention relates to the field of laser radar detection technology, and in particular to a laser radar optical assembly detection tool. Background Art

[0002] Laser ranging radar is a radar system that emits laser to detect the position, speed and other characteristic quantities of the target. Its working principle is to emit laser to the target, and then process and calculate the received signal reflected from the target (target echo), so as to obtain the target's distance, direction and other related information.

[0003] In order to make the laser be emitted and received better, an optical assembly (lens group) is set at the front end of the emitting components and the receiving coms to change the direction of the light so that the angles of the emitted and received light meet the requirements of the product.

[0004] Optical assemblies generally include lenses and structural parts for fixing lenses. Since there are errors in the processing of lenses and structural parts in optical assemblies, and there are also errors in the assembly of lenses and structural parts, when the cumulative errors exceed the design allowable range, the products produced are basically defective. Therefore, it is necessary to inspect the optical assemblies.

[0005] In the prior art, the inspection of optical assemblies is carried out separately. Optical lenses need to be individually inspected for important parameters such as diameter and focal length, and structural parts need to be comprehensively measured for various important dimensions. However, during actual production and inspection, the pass rate of a single optical device cannot ensure that the assembled optical assembly still meets the performance requirements. Unqualified optical assemblies cannot be detected intuitively, and usually in the final stage of the production process, after being assembled into a complete radar instrument, they are scrapped or processed as defective products of the whole machine because they cannot pass the performance test. This will seriously waste production resources. Especially in the early stages of large-scale production, process instability may cause a large proportion of optical assemblies in the entire current batch to be unqualified, which requires a device that can detect the overall performance of optical assemblies. Summary of the invention

[0006] The embodiment of the present application is to propose a laser radar optical assembly detection tool to solve the problem that the existing technology cannot effectively detect the laser radar optical assembly.

[0007] To achieve this purpose, the present invention adopts the following technical solutions:

[0008] On the one hand, a laser radar optical assembly detection tool includes a base, a bracket, a detection adjustment structure, and a background plate. The bracket and the background plate are arranged on the base and the distance between them is adjustable. The detection adjustment structure is arranged on the bracket and is used to set the optical assembly to be tested and the detection circuit board. The detection circuit board includes a light source, and the light source is located at the focus of the optical assembly to be tested. The light emitted by the light source is irradiated onto the background plate through the optical assembly to be tested.

[0009] In one possible implementation, the detection and adjustment structure includes a base, a guide column, a slider, a slide rail, a pull rod, and a compression spring. The base has a first fixed table and a second fixed table, wherein the first fixed table is used to set the optical assembly to be tested, the guide column is set between the two fixed tables, a slide rail is provided between the two fixed tables, a slider is provided on the slide rail, the slider is slidably connected to the guide column, a side of the slider close to the assembly to be tested is used to set a circuit board for detection, a pull rod is provided on the side away from the assembly to be tested, and a compression spring is provided on the guide column between the side away from the assembly to be tested and the second fixed table.

[0010] In a possible implementation, the distance between the bracket and the background plate is 0.5 meters to 2 meters.

[0011] In a possible implementation, the optical assembly to be tested and the circuit board for testing are clearance-fitted, and the fitting tolerance value is -0.002 to +0.002 mm.

[0012] In a possible implementation, a mounting groove is provided on the first fixing platform for arranging the assembly to be tested.

[0013] In a possible implementation, a mounting groove is provided on a side of the sliding block close to the assembly to be tested, for arranging a circuit board for testing.

[0014] In a possible implementation, the light source is a visible light source or an infrared light source.

[0015] In a possible implementation, the wavelength of the visible light source is 400-760 nm.

[0016] In a possible implementation, when the light source is an infrared light source, it also includes an infrared camera module and an image processing module. The infrared camera module is used to observe the light spot, and the image processing module is used to process the image.

[0017] In a possible implementation manner, the image processing module processes the light spot image into a relative light intensity distribution curve of the light spot image.

[0018] In the embodiment of the present application, the light source on the detection circuit board is imaged onto a background board at a corresponding distance through the optical assembly to be tested. When the lens or structural parts in the optical assembly to be tested change or are not precisely assembled, causing the optical system to be out of focus, the image on the background board will change accordingly. Detecting the change can effectively detect that the component has been altered or an unqualified optical assembly to be tested has been assembled. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an overall schematic diagram of an embodiment of the present application.

[0020] Figure 2 It is a schematic diagram of the detection and adjustment structure of an embodiment of the present application.

[0021] Figure 3 It is an overall schematic diagram of an embodiment of the present application using an infrared light source.

[0022] Figure 4 This is a normal spot image of the embodiment of the present application.

[0023] Figure 5 It is a schematic diagram of the processing result of a normal image according to an embodiment of the present application.

[0024] Figure 6 This is a schematic diagram of an abnormal image processing result in an embodiment of the present application.

[0025] In the figure: 1. base; 2. bracket; 3. detection and adjustment structure; 4. background plate; 5. pedestal; 6. guide column; 7. slider; 8. slide rail; 9. pull rod; 10. compression spring; 11. detection circuit board; 12. optical assembly to be tested; 13. infrared camera module; 14. first fixed platform; 15. second fixed platform; 16. light spot. DETAILED DESCRIPTION

[0026] The technical solution of the present application is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0027] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0028] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0029] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, device, product or equipment that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0030] Embodiments of the present application.

[0031] like Figure 1 , Figure 2 As shown, a laser radar optical assembly detection tool includes a base 1, a bracket 2, a detection adjustment structure 3, and a background plate 4. The bracket 2 and the background plate 4 are arranged on the base 1 and the distance between them is adjustable. The detection adjustment structure 3 is arranged on the bracket 2, and is used to set the optical assembly to be tested 12 and the circuit board 11 for detection. The circuit board 11 for detection includes a light source (not shown in the figure), and the light source is located at the focus of the optical assembly to be tested 12. The light source emits light through the optical assembly to be tested 12 and irradiates the background plate 4.

[0032] In this embodiment, the light source on the detection circuit board 11 is imaged on the background plate 4 at a corresponding distance through the optical assembly 12 to be tested. When the lens or structural parts in the optical assembly to be tested change or are not precisely assembled, resulting in the optical system being out of focus, the light spot on the background plate 4 will change accordingly. When the operator finds the change, the optical assembly to be tested whose components have been changed or whose assembly is unqualified can be quickly and effectively detected. The accuracy of the assembly positioning of each component of the optical assembly is ensured, mass production of products is facilitated, production resources are saved, and the product yield rate is improved.

[0033] like Figure 2 As shown, the detection and adjustment structure 3 includes a base 5, a guide column 6, a slider 7, a slide rail 8, a pull rod 9, and a compression spring 10. The base 5 has a first fixed platform 14 and a second fixed platform 15, wherein the first fixed platform 14 is used to set the optical assembly to be tested 12, the guide column 6 is arranged between the two fixed platforms, a slide rail 8 is arranged between the two fixed platforms, a slider 7 is arranged on the slide rail 8, the slider 7 is slidably connected to the guide column 6, a side of the slider 7 close to the optical assembly to be tested 12 is used to set a detection circuit board 11, a side away from the optical assembly to be tested 12 is provided with a pull rod 9, and a compression spring 10 is arranged on the guide column 6 between the side away from the optical assembly to be tested 12 and the second fixed platform 15.

[0034] During the inspection, the inspection circuit board 11 is set on the slider 7, the slider 7 is pulled open by the pull rod 9, and then the optical assembly 12 to be tested is set on the first fixed platform 14, and the pull rod 9 is gently released, so that the inspection circuit board 11 on the slider 7 is tightly assembled with the optical assembly 12 to be tested under the action of the compression spring 10, and it is confirmed that the positioning structure of the inspection circuit board 11 and the optical assembly 12 to be tested cooperates well. At this time, the output light of the inspection circuit board 11 is irradiated onto the background plate 4 through the optical assembly 12 to be tested, and the light spot pattern on the background plate 4 is observed to determine whether the optical assembly to be tested is assembled accurately. According to the light source and the assembly to be tested, the distance between the inspection circuit board 11 and the optical assembly to be tested 12 can be adjusted so that the light source set on the inspection circuit board 11 is at the focus of the optical assembly 12 to be tested.

[0035] The distance between the support 2 and the background plate 4 is 0.5 m to 2 m. The actual value needs to be determined according to the focal length of the optical assembly to be measured.

[0036] The optical assembly 12 to be tested and the circuit board 11 for testing are clearance-fitted, and the fitting tolerance value is -0.002 to +0.002 mm, which can meet the accuracy requirements of the optical assembly 12 to be tested.

[0037] The first fixing platform 14 is provided with a mounting groove for mounting the optical assembly 12 to be tested.

[0038] The sliding block 7 has a mounting groove on a side close to the optical assembly 12 to be tested, for setting a circuit board for testing.

[0039] The optical assembly 12 to be tested and the circuit board 11 for testing are arranged in a mounting slot, which is convenient for taking and placing. The arrangement of the mounting slot is a prior art in the art.

[0040] The light source is a visible light source or an infrared light source.

[0041] The wavelength of the visible light source is 400-760nm.

[0042] like Figure 3 As shown, when the light source is an infrared light source, it also includes an infrared camera module 13 and an image processing module (not shown in the figure). The infrared camera module 13 is used to observe the light spot, and the image processing module is used to process the image.

[0043] For the convenience of operation and management, human eye observation is replaced by observation using infrared camera module 13, and image recognition is performed to achieve objective and accurate detection. Because the infrared camera module 13 is used for observation, the light source used can be the original light source of the infrared radar. Therefore, when the infrared camera module 13 is used to detect the optical structure and assembly state of the emission part in the infrared radar optical assembly, the imaging light spot on the background board is the state of the emission light spot when the actual radar is running. Figure 4 It is the light spot image on the background plate.

[0044] The image processing module processes the light spot image into a relative light intensity distribution curve of the light spot image.

[0045] The image processing module identifies the light spot image, identifies the position of the light spot 16 in the entire image captured by the infrared camera module 13, determines the center of the light spot 16, determines the horizontal and vertical axes of the light spot 16 image with the center of the light spot 16 as the origin, and draws the light intensity distribution curve in the horizontal axis direction of the image, referred to as row; draws the light intensity distribution curve in the vertical axis direction of the image, referred to as col, and the row and col curves together constitute the light intensity distribution curve.

[0046] The coordinate system of the light intensity distribution curve takes the center of the light spot as the origin, and the horizontal axis is the distance of the pixel relative to the center of the light spot, in mm. The vertical axis is the relative light intensity, in cd. When the optical assembly is qualified, the row and col curves should be M-type, such as Figure 5 When the optical assembly is unqualified, the image is out of focus, the spot image is abnormal, and the relative light intensity distribution curve is not an obvious M-type. Figure 6 That is, a schematic diagram of an abnormal image processing result. After the image processing module converts the spot image into a relative light intensity distribution curve, the relative light intensity distribution curve can be identified through the module's built-in program, which has a higher degree of automation and reduces the possible errors in manual identification. The image processing module can be a computer or other processor.

[0047] In addition to the relative light intensity distribution curve, other forms of images may also be used to identify whether the optical assembly to be tested is assembled correctly.

[0048] The technical principles of the present application are described above in conjunction with specific embodiments. These descriptions are only for explaining the principles of the present application and cannot be interpreted in any way as limiting the scope of protection of the present application. Based on the explanations herein, those skilled in the art can think of other specific implementations of the present application without creative work, and these methods will fall within the scope of protection of the present application.

Claims

1. A laser radar optical assembly inspection tool, It is characterized in that It includes a base, a bracket, a detection adjustment structure, and a background plate. The bracket and the background plate are arranged on the base and the distance between them can be adjusted. The detection adjustment structure is arranged on the bracket and is used to set the optical assembly to be tested and the circuit board for detection. The circuit board for detection includes a light source, which is located at the focus of the optical assembly to be tested. The light emitted by the light source is irradiated onto the background plate through the optical assembly to be tested. The detection adjustment structure includes a base, a guide column, a slider, a slide rail, a pull rod, and a compression spring. The base has a first fixed platform and a second fixed platform, wherein the first fixed platform is used to set the optical assembly to be tested, the guide column is arranged between the two fixed platforms, a slide rail is arranged between the two fixed platforms, a slider is arranged on the slide rail, the slider is slidably connected to the guide column, the side of the slider close to the assembly to be tested is used to set the circuit board for detection, the side away from the assembly to be tested is provided with a pull rod, and the guide column between the side away from the assembly to be tested and the second fixed platform is provided with a compression spring.

2. A laser radar optical assembly detection tool according to claim 1, It is characterized in that The distance between the support and the background plate is 0.5 meters to 2 meters.

3. A laser radar optical assembly detection tool according to claim 2, It is characterized in that The optical assembly to be tested and the circuit board for testing are clearance-fitted, and the fitting tolerance value is -0.002 to +0.002 mm.

4. A laser radar optical assembly detection tool according to claim 3, It is characterized in that The first fixing platform is provided with a mounting groove for arranging the assembly to be tested.

5. A laser radar optical assembly detection tool according to claim 4, It is characterized in that A mounting groove is provided on a side of the sliding block close to the assembly to be tested, for arranging a circuit board for testing.

6. A laser radar optical assembly detection tool according to claim 5, It is characterized in that The light source is a visible light source or an infrared light source.

7. A laser radar optical assembly detection tool according to claim 6, It is characterized in that The wavelength of the visible light source is 400-760nm.

8. A laser radar optical assembly detection tool according to claim 7, It is characterized in that When the light source is an infrared light source, it also includes an infrared camera module and an image processing module. The infrared camera module is used to observe the light spot, and the image processing module is used to process the image.

9. A laser radar optical assembly detection tool according to claim 8, It is characterized in that The image processing module processes the light spot image into a relative light intensity distribution curve of the light spot image.

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