CN112113744A

CN112113744A - Laser radar optical assembly part detects frock

Info

Publication number: CN112113744A
Application number: CN201910545045.XA
Authority: CN
Inventors: 杨野; 刘扬; 疏达; 李�远
Original assignee: Benewake Beijing Co Ltd
Current assignee: Benewake Beijing Co Ltd
Priority date: 2019-06-21
Filing date: 2019-06-21
Publication date: 2020-12-22

Abstract

The application relates to laser radar detection field especially relates to a laser radar optical assembly spare detects frock. This application includes base, support, detection regulation structure, background board, support, background board set up on the base and apart from adjustable, the detection adjust the structure setting on the support for set up the optical assembly spare that awaits measuring, circuit board for the detection includes a light source, and the light source is located the focus of the optical assembly spare that awaits measuring, light source emission light shine on the background board through the optical assembly spare that awaits measuring. The light source on the detection circuit board is imaged on the background board at the corresponding distance through the optical assembly to be detected, when the lens or the structural part in the optical assembly to be detected is changed or the optical system is out of focus due to non-precise assembly, the image on the background board is correspondingly changed, and therefore the optical assembly to be detected with changed elements or unqualified assembly is effectively detected.

Description

Laser radar optical assembly part detects frock

Technical Field

The invention relates to the technical field of laser radar detection, in particular to a laser radar optical assembly part detection tool.

Background

The laser ranging radar is a radar system that emits characteristic quantities such as the position and speed of a laser detection target. The working principle is that laser is emitted to a target, and then the received signal (target echo) reflected from the target is processed and calculated, so that the relevant information such as the distance, the direction and the like of the target can be obtained.

In order to enable laser to be better transmitted and received, an optical assembly (lens group) is arranged at the front ends of the transmitting component and the receiving coms so as to change the light direction, and the angle of the transmitted and received light meets the requirement of a product.

Since the optical assembly generally includes a lens and a structural member for fixing the lens, since the lens and the structural member in the optical assembly have errors during processing and errors during assembly, when the accumulated errors exceed a design tolerance, the optical assembly is basically rejected, and thus the optical assembly needs to be inspected.

The prior art tests on optical assemblies are performed separately. The optical lens needs to detect important parameters such as diameter, focal length and the like independently, and the structural part needs to measure all important dimensions comprehensively. However, in actual production and inspection, the yield of individual optical devices cannot ensure that the assembled optical assembly still meets the performance requirements. The unqualified optical assembly cannot be visually detected, and generally, the optical assembly cannot be rejected or treated as a defective product of the whole radar instrument due to the failure of performance detection after being assembled into a complete radar instrument in the final stage of a production process. This would severely waste production resources. Especially in the early stages of mass production, process instability may cause a large percentage of optical assemblies to be rejected in the current whole batch, which makes it more desirable to have a device capable of detecting the overall performance of the optical assemblies.

Disclosure of Invention

The embodiment of the application provides a laser radar optical assembly part detection tool, and solves the problem that the prior art cannot effectively detect the laser radar optical assembly part.

To achieve the purpose, the embodiment of the invention adopts the following technical scheme:

on the one hand, laser radar optical assembly detects frock, includes base, support, detects and adjusts structure, background board, support, background board set up on the base and apart from adjustable, the detection adjust the structure setting on the support for set up the optical assembly that awaits measuring, circuit board for the detection includes a light source, and the light source is located the focus of the optical assembly that awaits measuring, light source transmission light shine on the background board through the optical assembly that awaits measuring.

In a possible implementation manner, the detection and adjustment structure comprises a base, a guide pillar, a sliding block, a sliding rail, a pull rod and a pressure spring, wherein the base is provided with a first fixed station and a second fixed station, the first fixed station is used for setting an optical assembly to be detected, the guide pillar is arranged between the two fixed stations, the sliding rail is arranged between the two fixed stations, the sliding block is arranged on the sliding rail, the sliding block is connected with the guide pillar in a sliding manner, one side of the sliding block, which is close to the assembly to be detected, is used for setting a circuit board for detection, the pull rod is arranged on the side of the sliding block, which is far away from the assembly to be detected, and the pressure spring is arranged.

In a possible implementation mode, the distance between the support and the background plate is 0.5-2 meters.

In a possible implementation manner, the optical assembly to be tested and the circuit board for detection are in clearance fit, and the fit tolerance value is-0.002 to +0.002 mm.

In a possible implementation manner, the first fixing table is provided with a mounting groove for mounting an assembly to be tested.

In a possible implementation manner, a mounting groove is formed in one surface, close to the assembly to be detected, of the sliding block, and the mounting groove is used for arranging a circuit board for detection.

In a possible implementation manner, the light source is a visible light source or an infrared light source.

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

In a possible implementation manner, when the light source is an infrared light source, the system further comprises an infrared camera module and an image processing module, wherein the infrared camera module is used for observing the light spot, and the image processing module is used for processing the image.

In one possible implementation, the image processing module processes the light spot image into a relative intensity distribution curve of the light spot image.

The light source on the detection circuit board is imaged on the background board at the corresponding distance through the optical assembly to be detected, when the lens or the structural part in the optical assembly to be detected is changed or the optical system is out of focus due to non-precise assembly, the image on the background board is correspondingly changed, and the change can be found to effectively detect that the element is changed or the unqualified optical assembly to be detected is assembled.

Drawings

Fig. 1 is an overall schematic diagram of an embodiment of the present application.

FIG. 2 is a schematic diagram of a detection and adjustment structure according to an embodiment of the present application.

FIG. 3 is a schematic overall view of an embodiment of the present application after an infrared light source is used.

Fig. 4 is a normal spot image according to an embodiment of the present application.

Fig. 5 is a diagram illustrating a result of processing a normal image according to an embodiment of the present application.

Fig. 6 is a schematic diagram illustrating an abnormal image processing result according to an embodiment of the present application.

In the figure: 1. a base; 2. a support; 3. the device comprises a detection adjusting structure, 4, a background plate, 5, a base, 6, a guide pillar, 7, a sliding block, 8, a sliding rail, 9, a pull rod, 10, a pressure spring, 11, a detection circuit board, 12 and an optical assembly to be detected; 13. an infrared camera module; 14. a first fixed table; 15. a second stationary stage; 16. a light spot.

Detailed Description

The technical scheme of the application is further explained by the specific implementation mode in combination with the attached drawings.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, apparatus, article, or device that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or device.

The embodiment of the application.

As shown in fig. 1 and 2, a laser radar optical assembly detection tool includes a base 1, a support 2, a detection adjusting structure 3, and a background plate 4, where the support 2 and the background plate 4 are disposed on the base 1, and the distance between the support 2 and the background plate 4 is adjustable, the detection adjusting structure 3 is disposed on the support 2 and is used for disposing an optical assembly to be detected 12 and a circuit board for detection 11, the circuit board for detection 11 includes a light source (not shown in the drawings), the light source is located at a focus of the optical assembly to be detected 12, and the light source emits light onto the background plate 4 through the optical assembly to be detected 12.

In this embodiment, the light source on the circuit board 11 for detection is imaged on the background board 4 at a corresponding distance through the optical assembly 12 to be detected, when the lens or the structural member in the optical assembly to be detected is changed or the optical system is out of focus due to inaccurate assembly, the light spot on the background board 4 is correspondingly changed, and when the change is found by an operator, the optical assembly to be detected with the changed or unqualified assembly can be quickly and effectively detected. The accuracy of the assembly positioning of each device of the optical assembly part is guaranteed, the mass production of products is facilitated, production resources are saved, and the yield of the products is improved.

As shown in fig. 2, the detection and adjustment structure 3 includes a base 5, a guide post 6, a slider 7, a slide rail 8, a pull rod 9, and a pressure spring 10, where the base 5 has a first fixing station 14 and a second fixing station 15, the first fixing station 14 is used for setting an optical assembly 12 to be detected, the guide post 6 is disposed between the two fixing stations, the slide rail 8 is provided with the slider 7, the slider 7 is slidably connected to the guide post 6, one surface of the slider 7 close to the optical assembly 12 to be detected is used for setting a circuit board 11 for detection, one surface far away from the optical assembly 12 to be detected is provided with the pull rod 9, and the pressure spring 10 is disposed on the guide post 6 between the surface far away from the optical assembly 12 to be detected and.

During detection, the circuit board 11 for detection is arranged on the sliding block 7, the sliding block 7 is pulled open by the pull rod 9, then the optical assembly part 12 to be detected is arranged on the first fixing table 14, the pull rod 9 is slightly loosened, the circuit board 11 for detection on the sliding block 7 is tightly assembled with the optical assembly part 12 to be detected under the action of the pressure spring 10, the positioning structures of the circuit board 11 for detection and the optical assembly part 12 to be detected are well matched, at the moment, emergent light of the circuit board 11 for detection irradiates the background plate 4 through the optical assembly part 12 to be detected, light spot patterns on the background plate 4 are observed, and whether the optical assembly part to be detected is accurately assembled is judged. Depending on the light source and the component to be tested, the distance between the detection circuit board 11 and the optical component to be tested 12 can be adjusted so that the light source provided on the detection circuit board 11 is at the focus of the optical component to be tested 12.

The distance between the bracket 2 and the background plate 4 is 0.5-2 m. The actual value is determined according to the focal length of the optical assembly to be measured.

The optical assembly 12 to be detected and the detection circuit board 11 are in clearance fit, and the fit tolerance value is-0.002 to +0.002 mm. This accuracy may meet the accuracy requirements of the optical assembly 12 to be tested.

The first fixing table 14 is provided with a mounting groove for mounting the optical assembly 12 to be tested.

And one surface of the sliding block 7, which is close to the optical assembly part 12 to be detected, is provided with a mounting groove for arranging a circuit board for detection.

The optical assembly 12 to be detected and the detection circuit board 11 adopt a mounting groove clamping mode, so that the optical assembly is convenient to take and place. The manner of adopting the mounting groove to clamp is the prior art in the field.

The light source is a visible light source or an infrared light source.

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

As shown in fig. 3, when the light source is an infrared light source, the light source further includes an infrared camera module 13 and an image processing module (not shown), where the infrared camera module 13 is used to observe light spots, and the image processing module is used to process images.

In order to facilitate operation and management, human eye observation is replaced by observation by using the infrared camera module 13, and image recognition is carried out, so that objective and accurate detection is realized. Because of using infrared camera module 13 to observe, the light source that uses can be the original light source of infrared radar, therefore adopts infrared camera module 13 when detecting the optical structure and the assembled state of transmitting part in infrared radar optical assembly spare, and the formation of image facula on the background board is the state of the transmission facula when actual radar operation promptly. Fig. 4 is a spot image on a background plate.

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

The image processing module identifies the light spot image, identifies the position of the light spot 16 in the whole image shot by the infrared camera module 13, determines the center of the light spot 16, determines the horizontal axis and the vertical axis of the light spot 16 image by taking the center of the light spot 16 as an original point, and draws a light intensity distribution curve in the horizontal axis direction of the image, which is referred to as row for short; and drawing a light intensity distribution curve in the longitudinal axis direction of the image, namely col for short, and forming the light intensity distribution curve by the row curve and the col curve.

The coordinate system of the light intensity distribution curve takes the center of the light spot as an original point, the abscissa is the distance of the pixel relative to the center of the light spot, and the unit is mm. The ordinate is the relative light intensity in cd. When the optical assembly passes, the curve for row, col should be M-shaped, as shown in fig. 5. When the optical assembly is unqualified, the image is out of focus, the light spot image is abnormal, and the obtained relative light intensity distribution curve is not obvious in an M shape, and fig. 6 is a diagram illustrating the result of abnormal image processing. After the image processing module converts the light spot image into the relative light intensity distribution curve, the relative light intensity distribution curve can be identified through a program arranged in the module, the automation degree is higher, and errors possibly existing in manual identification are reduced. The image processing module may be a computer or other processor.

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

The technical principles of the present application have been described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the present application and is not to be construed in any way as limiting the scope of the application. Based on the explanations herein, those skilled in the art will be able to conceive other embodiments of the present application without inventive effort, which shall fall within the scope of the present application.

Claims

1. The utility model provides a laser radar optical assembly detects frock, its characterized in that includes base, support, detects adjusts structure, background board, support, background board set up on the base and apart from adjustable, the detection adjust the structure setting on the support for set up optical assembly, the circuit board for detection that awaits measuring, circuit board for detection includes a light source, and the light source is located the focus of optical assembly that awaits measuring, light source transmission light shine on the background board through waiting to measure optical assembly.

2. The lidar detection tool for the optical assembly according to claim 1, wherein the detection adjusting structure comprises a base, a guide post, a slider, a slide rail, a pull rod and a pressure spring, the base comprises a first fixing table and a second fixing table, the first fixing table is used for arranging the optical assembly to be detected, the guide post is arranged between the two fixing tables, the slide rail is arranged on the slide rail, the slider is slidably connected with the guide post, one surface of the slider close to the optical assembly to be detected is used for arranging a circuit board for detection, the surface far away from the optical assembly to be detected is provided with the pull rod, and the pressure spring is arranged on the guide post far away from the optical assembly to be detected and between the surface far away from the optical.

3. The lidar optical assembly detection tool according to claim 2, wherein the distance between the support and the background plate is 0.5 m to 2 m.

4. The lidar optical assembly detection tool according to claim 3, wherein the optical assembly to be detected and the circuit board for detection are in clearance fit, and the fit tolerance value is-0.002 to +0.002 mm.

5. The lidar optical assembly detection tool according to claim 4, wherein the first fixing table is provided with a mounting groove for mounting an assembly to be detected.

6. The lidar optical assembly detection tool according to claim 5, wherein a mounting groove is formed on one surface of the slider, which is close to the assembly to be detected, for mounting a detection circuit board.

7. The lidar optical assembly detection tool according to claim 6, wherein the light source is a visible light source or an infrared light source.

8. The lidar optical assembly detection tool of claim 7, wherein the visible light source wavelength is 400 and 760 nm.

9. The lidar optical assembly detection tool according to claim 8, further comprising an infrared camera module and an image processing module when the light source is an infrared light source, wherein the infrared camera module is used for observing light spots, and the image processing module is used for processing images.

10. The lidar optical assembly detection tool according to claim 9, wherein the image processing module processes the spot image into a relative intensity profile of the spot image.