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Laser light source, light emitting unit and laser radar

A technology of light emitting unit and laser light source, which is applied in the field of laser radar, can solve the problem of high emission power of the light emitting unit, achieve the effect of reducing the emission power, reducing the light emission power, and increasing the amount of echo signals

Pending Publication Date: 2022-03-15
HESAI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the light emitting unit of the lidar in the disclosed technology has the problem of high emission power.

Method used

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  • Laser light source, light emitting unit and laser radar
  • Laser light source, light emitting unit and laser radar
  • Laser light source, light emitting unit and laser radar

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Embodiment Construction

[0041] As mentioned in the background, lidar has the problem of high transmission power. Refer below figure 1 Schematic diagram of the laser radar optical path, and analyze the reasons for the high emission power of the laser radar.

[0042] The light emitting unit 1 includes a plurality of lasers for providing emitted light projected to the target S1 (or S2), and the emitted light reaches the target S1 (or S2) after being shaped by the first optical component 3, After being reflected by the target S1 (or S2), an echo beam is formed, and the echo beam is converged onto the light receiving unit 2 through the second optical assembly 4, and is detected by the light receiving unit 2, thereby realizing the target S1 (or S2) ) distance detection. The existing laser radar that uses SiPM or SPAD array as the light receiving unit, because the light receiving unit has extremely high sensitivity, one photon can trigger the avalanche of the SPAD unit, and based on the consideration of i...

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Abstract

The embodiment of the invention provides a laser light source, a light emitting unit and a laser radar, and the light emitting unit used for the laser radar comprises a first light emitting area; a second light emitting region; the first light-emitting area and the second light-emitting area are different in relative size, and the first light-emitting area and the second light-emitting area form the same light-emitting channel to detect target objects at different distances. According to the embodiment of the invention, the transmitting power of the light transmitting unit is reduced.

Description

technical field [0001] The invention relates to the field of laser radar, in particular to a laser light source, a light emitting unit and a laser radar. Background technique [0002] Lidar (LIDAR) undertakes important tasks such as roadside detection, obstacle recognition, and real-time localization and mapping (SLAM) in autonomous driving. [0003] Specifically, the LIDAR system includes a laser emitting system and a light receiving system. The laser emitting system includes a light emitting unit that generates emitted light pulses. The emitted light pulses are incident on the target and reflected to generate echo beams. Finally, the echo beams are received by the light receiving system. The receiving system accurately measures the travel time of an incident light pulse from when it is emitted to when it is reflected back. Because light pulses travel at the speed of light, and the speed of light is known, travel time can be converted into a measure of distance. [0004]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/02G01S17/931G01S7/48
CPCG01S17/02G01S17/931G01S7/4802G01S7/4815G01S17/42G01S7/4816G01S7/4868G01S7/4811G01S17/08
Inventor 陈杰向少卿
Owner HESAI TECH CO LTD