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A Coaxial Transmitting and Receiving LiDAR Based on Off-axis Incidence

A laser radar and light-emitting technology, applied in the field of laser radar, can solve the problems of low mechanical rotation rate, reduced image resolution, limited scanning field of view, etc., and achieve the effect of improving receiving efficiency

Active Publication Date: 2022-06-07
苏州岭纬智能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the existing coaxial technical solutions, the laser radar scans the field of view by mechanical rotation, the scanning field of view is limited, and it is not easy to expand the scanning field of view by other means
At the same time, the mechanical rotation rate is low, the image resolution is reduced, limited by the mirror, and the receiving efficiency is low

Method used

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  • A Coaxial Transmitting and Receiving LiDAR Based on Off-axis Incidence
  • A Coaxial Transmitting and Receiving LiDAR Based on Off-axis Incidence
  • A Coaxial Transmitting and Receiving LiDAR Based on Off-axis Incidence

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Embodiment 1

[0039] The first embodiment provides a coaxial transmitting and receiving laser radar based on off-axis incidence, as shown in the appendix figure 1 shown. The lidar includes a laser light source 10, a collimation unit 20, a first polarization splitting unit 301, a second polarization splitting unit 302, a third polarization splitting unit 303, a first polarization conversion unit 401, a second polarization conversion unit 402, and a mirror 50. The first filter 601 and the second filter 602, the first focusing unit 801, the second focusing unit 802, the receiving end detector 701 of the first receiving optical path and the receiving end detector 702 of the second receiving optical path, and the projection unit 90; the laser light source 10 emits a laser beam; the collimation unit 20 is used for collimating the laser beam, reducing the divergence angle of the beam, so that the laser beam can be projected over a longer distance;

[0040] The first polarization beam splitting un...

Embodiment 2

[0070] The second embodiment of the present invention provides a laser radar of the second structure, as shown in the appendix Figure 12 As shown, it includes a laser light source 1001, a collimation unit 2001, a first polarization splitting unit 3001, a second polarization splitting unit 3002 and a third polarization splitting unit 3003, a first polarization conversion unit 4001, a second polarization conversion unit 4002, a first polarization Filter 6001, second filter 6002, auxiliary reflector includes first reflector 500, second reflector 501 and third reflector 502, first compensation light source 1002 and second compensation light source 1003, auxiliary focusing unit includes The first focusing unit 8001, the second focusing unit 8002, the third focusing unit 8003 and the fourth focusing unit 8004, the first receiving optical path detector 7001, the second receiving optical path detector 7002, the image sensor includes the first image sensor 7003 and the second image se...

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Abstract

The invention discloses a coaxial transmitting and receiving laser radar based on off-axis incidence, a laser light source for emitting laser beams; a collimating unit for generating collimated beams; a transmitting component located in the transmitting optical path for collimating The light beam is incident into the projection unit; the polarization conversion unit is used to change the polarization state of the beam emitted from the polarization splitting unit, and the light beam after the polarization state is changed is incident on the projection unit; the reflector is used to change the propagation direction angle of the linearly polarized light; The component is located in the receiving optical path and receives the photons returned by the projection unit; the polarization conversion unit is used to change the polarization state of the photons returned by the projection unit; Interfering photons in the photons returned by the projection unit; the projection unit is a micro mirror driven by MEMS or motor or other electronic means; the invention provides a laser radar with simple structure, high receiving efficiency and larger scanning field of view.

Description

technical field [0001] The present invention relates to the technical field of laser radar, and more particularly, to a coaxial transmitting and receiving laser radar based on off-axis incidence. Background technique [0002] In recent years, with the development of various emerging technologies such as artificial intelligence, the Internet of Things and 5G technology, and the gradual breakthrough of material technology, LiDAR, which is suitable for various applications such as autonomous driving, 3D mapping, and security monitoring, has ushered in a wave of development. With its high resolution, excellent anti-interference ability, and all-weather continuous work, LiDAR is equipped with intelligent eyes for various artificial intelligence perception applications of various surrounding environments; combined with logic control algorithms, it is truly realized in the field of autonomous driving. For autonomous driving of L3 and above, lidar is a visual sensor that can perfect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/4911G01S7/4912G01S17/32
CPCG01S7/4911G01S7/4912G01S17/32Y02A90/10
Inventor 王金刚黎洪林坚林余斌黄塍波
Owner 苏州岭纬智能科技有限公司