Laser radar, and two-dimensional scanning method of laser radar

A laser radar and laser beam technology, applied in the field of two-dimensional scanning, can solve the problems of large volume, low resolution, and increased difficulty, and achieve the effects of simple device structure, improved resolution, and increased density

Pending Publication Date: 2021-02-05
HANGZHOU GUANGPO INTELLIGENT TECH CO LTD
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Problems solved by technology

At present, relatively mature laser radars include mechanical scanning radar and non-scanning radar; currently scanning laser radar occupies a relatively large market share; from the existing technology, there are two types of scanning laser radar, one is mechanical scanning, through The motor drives the mirror to rotate, and uses the principle of geometric optics to realize the deflection of the beam, and scans out a three-dimensional point cloud image; this method of scanning can be counted as a point scanning method, but the disadvantage is that the resolution is relatively low, and it can only be resolved at a long

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  • Laser radar, and two-dimensional scanning method of laser radar
  • Laser radar, and two-dimensional scanning method of laser radar

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[0027]The present invention will be described in detail below with reference to the specific embodiments shown in the drawings, but these embodiments do not limit the present invention. Those skilled in the art make structural, method, or functional changes based on these embodiments. All are included in the protection scope of the present invention.

[0028]Seefigure 1 ,figure 1 It is a schematic diagram of the laser radar structure of the present invention. As shown in the figure, the laser radar includes a tunable laser 10 and a scanning device 20. The tunable laser 10 is used to output a laser beam with a continuously variable wavelength, and its working waveband can cover the spectral range from near ultraviolet to far infrared. In the present invention, it is preferably light in the visible light to infrared wave range. The tunable laser 10 usually has a fixed position relative to the scanning device 20, and its own light angle is also relatively fixed, that is, a tunable laser 1...

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Abstract

The invention discloses a laser radar and a two-dimensional scanning method of the laser radar. The laser radar comprises at least one tunable laser and a scanning device, and the tunable laser is used for outputting a laser beam with continuously variable wavelength; and the scanning device comprises at least one scanning mirror and a driving device, and a diffraction grating is arranged on the scanning mirror and can have different diffraction angles for light of different wave bands. Continuous scanning in the horizontal one-dimensional direction is achieved through vibration or rotation ofthe scanning mirror, laser beams with different emergent angles are obtained through grating diffraction by changing the wavelength output by the tunable laser, and scanning in the vertical two-dimensional direction is achieved. According to the invention, the density of the laser point cloud is increased, the resolution of the spatial orientation is improved, and the device is simple in structure and easy to realize.

Description

technical field [0001] The invention relates to the technical field of laser radar, in particular to a laser radar and a two-dimensional scanning method of the laser radar. Background technique [0002] Lidar is a device that uses laser beams to search and track targets and accurately measure the target's orientation, distance and speed. Compared with microwave radar, lidar has the advantages of high resolution, good concealment, good low-altitude detection performance, small size, and light weight. At present, relatively mature laser radars include mechanical scanning radar and non-scanning radar; currently scanning laser radar occupies a relatively large market share; from the existing technology, there are two types of scanning laser radar, one is mechanical scanning, through The motor drives the mirror to rotate, and uses the principle of geometric optics to realize the deflection of the beam, and scans out a three-dimensional point cloud image; this method of scanning ...

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Application Information

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IPC IPC(8): G01S17/02G01S17/06G01S7/481
CPCG01S17/02G01S17/06G01S7/4817
Inventor 黄锦熙俞佳晨巩少斌陈一帆白云峰
Owner HANGZHOU GUANGPO INTELLIGENT TECH CO LTD
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