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All-solid-state laser radar and design method thereof

A technology of laser radar and design method, which is applied in the directions of re-radiation of electromagnetic waves, utilization of re-radiation, and measurement devices, which can solve problems such as low angular resolution, slow scanning speed, and small scanning angle

Pending Publication Date: 2021-01-29
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, all-solid-state LiDAR still has shortcomings and deficiencies such as slow scanning speed (10-30 Hz), small scanning angle (100-120°), and low angular resolution (>0.1°). Based on this, there is an urgent need for a new All-solid-state high-speed large-angle scanning lidar technology

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  • All-solid-state laser radar and design method thereof

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Embodiment 1

[0032] An embodiment of the present invention provides an all-solid-state laser radar based on space-time coherent modulation. The all-solid-state laser radar is mainly composed of a laser, a grating, a lens, and an area array detector. The laser, grating, lens, and area array detector are arranged in sequence. The laser is used to generate a laser beam; the grating is used to divide the laser beam into parallel light sources with equal angles and frequency differences; the lens is used to focus the parallel light sources into a three-dimensional light source array with equal intervals and equal frequency differences; The light sources at each frequency point in the light source array diverge outward with spherical waves, so that the interfering laser beams interfering with each other between the light sources at different frequency points are rotated and scanned, and the area array detector is used to detect the interfering laser beams at different scanning angles .

[0033] ...

Embodiment 2

[0078] An embodiment of the present invention provides a design method of an all-solid-state laser radar, the design method comprising:

[0079] The laser beam is generated by a laser; the laser beam is divided into an array of light sources with equal intervals and frequency differences through gratings and lenses;

[0080] The light sources at each frequency point in the light source array are diverged outward with spherical waves, so that the interfering laser beams interfering with each other between the light sources at different frequency points are rotated and scanned;

[0081] Interfering laser beams at different scanning angles are detected by an area array detector.

[0082] The all-solid-state laser radar designed based on the design method of the embodiment of the present invention can use a laser to generate a laser beam, use a grating and a lens to split and focus the laser beam, and divide the laser beam into point light sources with equal intervals and frequenc...

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Abstract

The invention relates to an all-solid-state three-dimensional scanning laser radar and a design method thereof. The all-solid-state three-dimensional scanning laser radar is mainly composed of a laserdevice, an optical grating, a lens and an area array detector. The laser device is used for generating laser beams. The optical grating is used for dividing a laser beam into parallel light sources with equal included angles and equal frequency differences; the lens is used for focusing the parallel light source into a three-dimensional light source array with equal interval and equal frequency difference, and diverging the light source of each frequency point in the light source array outwards in the form of spherical waves, so as to enable the interference laser beams with increased interference among the light sources of different frequency points to perform rotational scanning; and the area array detector is used for detecting interference laser beams with different scanning angles. High-speed large-angle scanning of laser beams is achieved, scanning from 65 degrees to -65 degrees in the horizontal direction and the vertical direction is achieved, the scanning speed is high and can reach up to terahertz, and the angular resolution is superior to 0.02 degree. And a mechanical rotating part is canceled, so the device has the advantages of high reliability, high precision, long service life, miniaturization and multiple functions.

Description

technical field [0001] The invention relates to the field of laser radar scanning, in particular to an all-solid-state laser radar based on space-time coherent modulation and a design method thereof. Background technique [0002] The rapid development of unmanned driving technology makes environmental perception sensors an important core device. Due to its high resolution, strong anti-interference, wide detection range, and nearly all-weather work, lidar can draw a three-dimensional environmental map around the vehicle in real time, and is considered an essential product for unmanned driving. [0003] Lidar technology is mainly divided into three types: mechanical rotation lidar, hybrid lidar and all-solid-state lidar. The mechanical rotation laser radar realizes laser scanning through the continuous rotation of the stepping motor to drive the mechanical rotation. It has high cost and short life. What's more serious is that it contains a large number of moving parts inside,...

Claims

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Application Information

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IPC IPC(8): G01S17/02G01S7/4914G01S7/4863G01S7/481
CPCG01S17/02G01S7/481G01S7/4817G01S7/4863G01S7/4914
Inventor 彭波
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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