A method for adjusting the optical path of a laser radar transmitting device

Abstract

The invention provides an optical path adjustment method for a laser radar transmitting device, belonging to the field of laser ranging. The adjustment method firstly movably mounts a semiconductor laser on a horizontal optical platform through a first clamp, and horizontally mounts a microscope system on the optical platform; then adjusts the positions of the semiconductor laser and the microscope system so that the laser tube end face of the semiconductor laser can be clearly imaged in the microscope system; then adjusts the semiconductor laser so that the center of the laser tube of the semiconductor laser crosses and coincides with a mark in the microscope system; then movably mounts a cylindrical lens between the semiconductor laser and the microscope system through a second clamp, and adjusts the position of the cylindrical lens so that the distance between the laser tube end face of the semiconductor laser and the cylindrical lens end face is the focal length of the cylindrical lens; finally, the semiconductor laser is connected to a driving power supply, and the semiconductor laser or the cylindrical lens is finely adjusted forward and backward so that the position of the light source is at the focus of the cylindrical lens, so that the collimation of the cylindrical lens to the light source is in an optimal state.

Description

Technical Field

[0001] The invention belongs to the technical field of laser ranging, and in particular relates to an optical path adjustment method for a laser radar transmitting device. Background Art

[0002] LiDAR technology actively emits a laser beam, which forms a diffuse reflection echo after irradiating the object to be measured. The receiving system receives the echo and obtains the distance information between the LiDAR and the object to be measured by measuring the time difference between the laser emission time and the echo reception time. Due to the advantages of lasers such as high repetition rate, small laser spot, concentrated energy, and good directionality, LiDAR can achieve long-distance and high-precision measurement of the object to be measured. In advanced driver assistance systems (ADAS) and autonomous driving systems, spatial distance measurement and three-dimensional environment reconstruction of the vehicle's surrounding environment are important prerequisites for achieving high-precision autonomous driving control.

[0003] In the laser radar transmitting system, the laser emitted by the light source needs to be shaped through the optical path before it can be emitted to the measured space. In the actual transmitting system, the shaping quality of the optical path is directly related to the performance of the laser radar. Therefore, the position requirements in the optical path shaping are very strict. If multiple laser light sources need to be shaped at the same time in the laser radar transmitting system, the difficulty of optical path shaping and the assembly and debugging cost of the entire laser radar will be increased invisibly. Summary of the invention

[0004] An embodiment of the present invention provides an optical path adjustment method for a laser radar transmitting device, aiming to solve the problems raised in the background technology.

[0005] The embodiment of the present invention is implemented as follows: a method for adjusting the optical path of a laser radar transmitting device, the method comprising an optical platform and a semiconductor laser, a microscope system and a cylindrical lens arranged on the optical platform, wherein the cylindrical lens is located between the semiconductor laser and the microscope system;

[0006] The specific steps include:

[0007] S1, movably mounting the semiconductor laser on a horizontal optical platform through a first fixture, and horizontally mounting the microscope system on the optical platform;

[0008] S2. Adjust the position of the semiconductor laser and the microscope system so that the laser tube end face of the semiconductor laser can be clearly imaged in the microscope system;

[0009] S3, adjusting the semiconductor laser so that the center of the laser tube of the semiconductor laser crosses and coincides with the mark in the microscope system;

[0010] S4, movably installing the cylindrical lens between the semiconductor laser and the microscope system through the second fixture, and adjusting the position of the cylindrical lens so that the distance between the laser tube end face of the semiconductor laser and the end face of the cylindrical lens is the focal length of the cylindrical lens;

[0011] S5. Connect the semiconductor laser to the driving power supply, and fine-tune the semiconductor laser or the cylindrical lens forward and backward to place the light source at the focal point of the cylindrical lens, so that the collimation of the cylindrical lens to the light source is in the best state.

[0012] Preferably, there is at least one semiconductor laser.

[0013] Preferably, the mark includes at least a cross mark.

[0014] Preferably, the first clamp and the second clamp are both clamps that can be adjusted in multiple dimensions.

[0015] Preferably, the plane of the cylindrical lens faces the semiconductor laser, and the radial direction of the cylindrical lens is horizontal to the optical platform.

[0016] This optical path adjustment method can install the laser in the laser radar for shaping. Most of the optical path debugging work in the laser emission system can be completed without lighting the laser. The laser is powered on to emit the light source. The relative position of the laser light source and the cylindrical lens can be fine-tuned to shape the light source to the optimal state. The difficulty of optical debugging in the laser emission system can be greatly reduced, especially when multiple light sources and multi-channel lasers need to be shaped at the same time, which can effectively reduce the debugging difficulty and cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The present invention is a schematic flow chart of the steps of a method for adjusting the optical path of a laser radar transmitting device;

[0018] Figure 2 The present invention is a schematic diagram of the installation status of each component in the optical path adjustment method of a laser radar transmitting device;

[0019] Figure 3 The present invention is a schematic diagram of the state in which the center of the laser tube overlaps with the cross cursor in the microscope system in the optical path adjustment method of the laser radar transmitting device.

[0020] In the figure:

[0021] 1. Optical platform; 2. Semiconductor laser; 3. Microscope system; 4. Cylindrical lens. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0023] The present invention provides a method for adjusting the optical path of a laser radar transmitting device, such as Figure 1 and Figure 2 As shown, the optical path adjustment method includes an optical platform 1 and a semiconductor laser 2, a microscope system 3 and a cylindrical lens 4 arranged on the optical platform 1, wherein the cylindrical lens 4 is located between the semiconductor laser 2 and the microscope system 3; wherein the semiconductor laser 2 is at least one.

[0024] The specific steps include:

[0025] S1. Use a first fixture to movably mount the semiconductor laser 2 on a horizontal optical platform 1, and horizontally mount the microscope system 3 on the optical platform 1.

[0026] S2. Adjust the positions of the semiconductor laser 2 and the microscope system 3 so that the laser tube end face of the semiconductor laser 2 can be clearly imaged in the microscope system 3.

[0027] S3, adjusting the semiconductor laser 2 so that the center of the laser tube of the semiconductor laser 2 crosses and overlaps with the mark in the microscope system 3; wherein the mark at least includes a cross mark. Figure 3 As shown, since the position of the emitting tube of the semiconductor laser 2 observed in the microscope system 3 has not changed before and after the cylindrical lens 4 is placed, and the microscope system 3 has only moved back and forth, the center of the emitting tube of the semiconductor laser 2 is parallel to the optical axis of the cylindrical lens 4 at this time.

[0028] S4, movably install the cylindrical lens 4 between the semiconductor laser 2 and the microscope system 3 through the second fixture, and adjust the position of the cylindrical lens 4 so that the distance between the laser tube end face of the semiconductor laser 2 and the end face of the cylindrical lens 4 is the focal length of the cylindrical lens 4; wherein the plane of the cylindrical lens 4 faces the semiconductor laser 2, and the radial direction of the cylindrical lens 4 is level with the optical platform 1. At this time, the cylindrical lens 4 is in a converging state for the light coming from the direction of the semiconductor laser 2.

[0029] S5. Connect the semiconductor laser 2 to the driving power supply, and fine-tune the semiconductor laser 2 or the cylindrical lens 4 forward and backward to make the light source position at the focus of the cylindrical lens 4, so that the collimation of the cylindrical lens 4 to the light source is in the best state.

[0030] Furthermore, in order to facilitate multi-dimensional adjustment of the semiconductor laser and the cylindrical lens, the first fixture and the second fixture are both multi-dimensionally adjustable fixtures.

[0031] This optical path adjustment method can install the laser in the laser radar for shaping. Most of the optical path debugging work in the laser emission system can be completed without lighting the laser. The laser is powered on to emit the light source. The relative position of the laser light source and the cylindrical lens can be fine-tuned to shape the light source to the optimal state. The difficulty of optical debugging in the laser emission system can be greatly reduced, especially when multiple light sources and multi-channel lasers need to be shaped at the same time, which can effectively reduce the debugging difficulty and cost.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for adjusting the optical path of a laser radar transmitting device, characterized in that: The optical path adjustment method comprises an optical platform, and a semiconductor laser, a microscope system and a cylindrical lens arranged on the optical platform, wherein the cylindrical lens is located between the semiconductor laser and the microscope system; The specific steps include: S1, movably mounting the semiconductor laser on a horizontal optical platform through a first fixture, and horizontally mounting the microscope system on the optical platform; S2. Adjust the position of the semiconductor laser and the microscope system so that the laser tube end face of the semiconductor laser can be clearly imaged in the microscope system; S3, adjusting the semiconductor laser so that the center of the laser tube of the semiconductor laser crosses and coincides with the mark in the microscope system; S4, movably installing the cylindrical lens between the semiconductor laser and the microscope system through the second fixture, and adjusting the position of the cylindrical lens so that the distance between the laser tube end face of the semiconductor laser and the end face of the cylindrical lens is the focal length of the cylindrical lens; S5. Connect the semiconductor laser to the driving power supply, and fine-tune the semiconductor laser or the cylindrical lens forward and backward to place the light source at the focal point of the cylindrical lens, so that the collimation of the cylindrical lens to the light source is in the best state.

2. The optical path adjustment method of the laser radar transmitting device according to claim 1, characterized in that: There is at least one semiconductor laser.

3. The optical path adjustment method of the laser radar transmitting device according to claim 1, characterized in that: The mark at least includes a cross mark.

4. The optical path adjustment method of the laser radar transmitting device according to claim 1, characterized in that: The first clamp and the second clamp are both clamps that can be adjusted in multiple dimensions.

5. The optical path adjustment method of the laser radar transmitting device according to claim 1, characterized in that: The plane of the cylindrical lens faces the semiconductor laser, and the radial direction of the cylindrical lens is level with the optical platform.

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