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Lidar and how it works

A technology of laser radar and laser beam, which is applied in the direction of instruments, measuring devices, and re-radiation, can solve the problem of low angular resolution, achieve the effect of increasing angular resolution and improving performance

Active Publication Date: 2020-02-07
HESAI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the angular resolution of existing multi-line lidars is still low

Method used

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  • Lidar and how it works
  • Lidar and how it works
  • Lidar and how it works

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0027] The existing lidar has many problems, for example, the angular resolution is still low.

[0028] Now combine a kind of lidar to analyze the reasons for the lower angular resolution of the lidar:

[0029] The laser radar device includes: a laser, the laser is used to generate laser light to a target; and a detector, the detector is used to receive the laser light reflected back from the target.

[0030] During the operation of lidar, the laser emits laser light to the target. After the laser reaches the target, it returns to the detector due to the diffuse reflection of the target. The traditional lidar only includes one laser and one detector. Therefore, the lidar device can only emit one laser beam at the same time, resulting in a low vertical angular resolution of the lidar. In order to improve the vertical angular resolution of lidar, a multi-line lidar is proposed.

[0031] figure 1 It is a schematic diagram of the laser structure of a multi-line lidar.

[0032] Please refe...

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PUM

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Abstract

The invention provides a laser radar and a forming method thereof; the laser radar comprises an emitter, a Dammann grating, and a receiver; the emitter is used for emitting a first laser beam to a to-be-detected target; the emitter has a rotating shaft; the angle between the first laser beam propagation direction and the rotating shaft is greater than 0; the emitter rotates around the rotating shaft; the Dammann grating has a first raster period along a first direction; the first direction and the rotating shaft form an acute angle; the Dammann grating is used for splitting the first laser beam into a plurality of second laser beams propagating to different directions; the second laser beams arrive at the to-be-detected target, and echo light beams are reflected; the receiver is used for receiving the echo light beams; the laser radar has a higher angle resolution.

Description

Technical field [0001] The invention relates to the technical field of semiconductor manufacturing, in particular to a laser radar and a working method thereof. Background technique [0002] Lidar is a commonly used ranging sensor, which has the characteristics of long detection distance, high angular resolution, and low environmental interference. It is widely used in intelligent robots, unmanned aerial vehicles, unmanned driving and other fields. The working principle of lidar is similar to that of micro-wave radar, which uses the time it takes for light waves to travel between the radar and the target to evaluate the distance. [0003] The lidar at the beginning was a single-line lidar, that is, there was only one laser and a detector, and its scanning target range was limited, which easily caused the lack of detection targets. In order to make up for the shortcomings of single-line lidar, multi-line lidar has increasingly become the focus of research and commercial use. Multi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/481G01S17/02
CPCG01S7/4811G01S17/02
Inventor 卢炎聪王瑞向少卿李一帆
Owner HESAI TECH CO LTD
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