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Coaxial transmitting and receiving laser radar based on off-axis incidence

A technology of laser radar and light emission, which is applied in the direction of using re-radiation, re-radiation of electromagnetic waves, measuring devices, etc., can solve the problems of low mechanical rotation speed, difficult expansion of scanning field of view, limited scanning field of view, etc., to improve reception efficiency effect

Active Publication Date: 2020-06-12
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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  • Coaxial transmitting and receiving laser radar based on off-axis incidence
  • Coaxial transmitting and receiving laser radar based on off-axis incidence
  • Coaxial transmitting and receiving laser radar based on off-axis incidence

Examples

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Effect test

Embodiment 1

[0039] Embodiment 1 provides a coaxial transmitting and receiving laser radar based on off-axis incidence, as shown in the attached 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, a mirror 50. The first optical filter 601 and the second optical filter 602, the first focusing unit 801, the second focusing unit 802, the first receiving optical path receiving end detector 701 and the second receiving optical path receiving end detector 702, and the projection Unit 90; the laser light source 10 emits a laser beam; the collimation unit 20 is used to collimate the laser beam, reduce the divergence angle of the beam, so that the laser beam can project a longer distance;

[0040] The first polarization splitting unit 301 is located in the optic...

Embodiment 2

[0070] Embodiment 2 of the present invention provides the laser radar with the second structure, as shown in the attached 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 Optical filter 6001, second optical 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 focus 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, and the image sensor includes the first image sensor 7003 And the second image sen...

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Abstract

The invention discloses a coaxial transmitting and receiving laser radar based on off-axis incidence. The coaxial transmitting and receiving laser radar includes: a laser light source which is used for transmitting a laser beam; a collimation unit which is used for generating a collimated light beam; an emitting assembly which is located in the emitting light path and used for emitting the collimated light beams into the projection unit; a polarization conversion unit which is used for changing the polarization state of the light beam emitted from the polarization light splitting unit, and thelight beam with the changed polarization state enters the projection unit; a reflector which is used for changing the propagation direction angle of linearly polarized light; a receiving assembly which is located in the receiving light path and receives photons returned by the projection unit; a polarization conversion unit which is used for changing the polarization state of photons returned bythe projection unit, wherein the focusing unit is used for converging the photons received by the receiving optical path to the receiving end detector, and the optical filter is used for filtering interference photons in the photons returned by the projection unit; a projection unit which is a micro reflecting mirror driven based on an MEMS or a motor or other electronic modes. The laser radar provided by the invention is simple in structure, high in receiving efficiency and larger in scanning view field.

Description

technical field [0001] The invention relates to the technical field of laser radar, more specifically, 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 suitable for various applications such as autonomous driving, 3D mapping, and security monitoring has ushered in a boom in development. With its high resolution, excellent anti-interference ability and all-weather continuous work, lidar is equipped with intelligent eyes for various artificial intelligence applications in the perception of various surrounding environments; coupled 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 perfectly replace human eyes...

Claims

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Application Information

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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