Laser transceiver and laser radar

A laser transceiver and light source device technology, applied in the laser field, can solve the problems of small detection distance and difficulty in satisfying automatic driving, and achieve the effects of extending detection distance, increasing power, and expanding detection range

Active Publication Date: 2020-11-24
HESAI TECH CO LTD
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  • Application Information

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Problems solved by technology

[0004] However, existing lidars that use coherent detection technology often have a small detection distance, which makes it difficult to meet the needs of new technologies such as autonomous driving.

Method used

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  • Laser transceiver and laser radar
  • Laser transceiver and laser radar
  • Laser transceiver and laser radar

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Experimental program
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Embodiment Construction

[0035] It can be seen from the background art that the lidar using coherent detection technology in the prior art often has the problem of a small detection distance. Now combine a laser radar transceiver device to analyze the reasons for its small detection distance:

[0036] refer to figure 1 , shows a schematic structural diagram of a laser transceiver device in a laser radar using coherent detection technology.

[0037] The laser transceiver 10 includes: a beam splitting unit 12, the input end of the beam splitting unit 12 is connected to the laser light source 11; The output end is connected; the coupling unit 15, the input end of the coupling unit 15 is connected with the other output end of the beam splitting unit 12, the input end of the coupling unit 15 is also connected with the outgoing collection unit 14, the The output of the coupling unit 15 is connected to a detection device 16 .

[0038] Wherein, the beam splitting unit 12 and the coupling unit 15 are genera...

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Abstract

Disclosed are a laser transceiver device and a laser radar. The laser transceiver device includes a light-splitting coupling unit that splits original light into first original light and second original light, an emerging unit that forms emergent light according to the first original light, and an acquiring unit that acquires echoed light to form signal light, and further includes at least one ofa first acting surface that reflects part of the first original light to form first local oscillating light and a second acting surface that reflects parts of the second original light to form secondlocal oscillating light. Since the first local oscillating light is formed by the first original light partly reflected by the first acting surface and the second local oscillating light is formed bythe second original light partly reflected by the second acting surface, the first local oscillating light and the second local oscillating light have relatively low power, thus the power of the emergent light can be improved effectively, so as to effectively extend the detection distance of the laser radar and expand the detection range of the laser radar while keeping the process and cost unchanged.

Description

technical field [0001] The invention relates to the field of lasers, in particular to a laser transceiver and a laser radar. Background technique [0002] Lidar is a commonly used ranging sensor, which has the characteristics of long detection distance, high resolution, and low environmental interference. It is widely used in intelligent robots, drones, unmanned driving and other fields. In recent years, with the rapid development of autonomous driving technology, lidar, as the core sensor of distance perception, has become indispensable. [0003] In the application of vehicle-mounted laser radar, continuous wave frequency modulation (FMCW) coherent laser radar obtains the distance and speed of the target by Fourier transforming the intermediate frequency signal obtained by mixing the local local oscillator optical signal and the signal to be measured. Compared with incoherent pulse lidar based on time-of-flight (TOF) ranging, it has some outstanding advantages, such as: hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/481G01S17/08
CPCG01S7/4811G01S17/08
Inventor 汪洋向少卿
Owner HESAI TECH CO LTD
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