Polarization calibration and compensation device and method of polarization laser radar

A technology of lidar and compensation device, applied in radio wave measurement systems, instruments, etc., can solve problems such as measurement result errors

Inactive Publication Date: 2015-01-21
XIAN UNIV OF TECH
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Problems solved by technology

[0003] The purpose of the present invention is to provide a polarization calibration and compensation device for polarized laser radar, which solves the problem that the polarization state of the polarized laser radar optical path system in the prior art causes large errors in measurement results

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  • Polarization calibration and compensation device and method of polarization laser radar
  • Polarization calibration and compensation device and method of polarization laser radar
  • Polarization calibration and compensation device and method of polarization laser radar

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Embodiment

[0088] The adopted laser 1 emits horizontal linearly polarized light with a beam diameter of 10 mm, a divergence angle of 10 mrad, and a wavelength of 532 nm. The linearly polarized light passes through the first λ wave plate 2, the first After the lambda wave plate 3 changes the polarization state, it enters the beam expander 4 with a magnification of 20 times. After passing through the beam expander, the laser beam becomes a wide-aperture beam with an aperture of 200 mm. The laser beam enters the laser radar system 5 and then enters the The polarizer 6 with an extinction ratio of 5000:1 and the converging mirror 7 with a focal length of 100mm are finally received by the energy meter 8, and the Miller matrix of the laser radar system 5 obtained by testing is:

[0089] M = 0.5 1.97 0.00634 2.598 ...

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Abstract

The invention discloses a polarization calibration and compensation device of polarization laser radar. The polarization calibration and compensation device comprises a polarization calibration portion and a polarization compensation portion. The polarization calibration portion comprises a laser. A first 1/4 lambda wave plate, a first 1/2 lambda wave plate, a beam expander, a laser radar system, a polarizer, a convergent mirror and an energy meter are sequentially arranged on the light beam of the laser. The polarization compensation portion comprises a rotary controller. A second 1/4 lambda wave plate, a third 1/4 lambda wave plate and a second 1/2 lambda wave plate are connected to the rotary controller through cables. The polarization compensation portion is arranged between the laser radar system and the polarizer. The second 1/4 lambda wave plate, the third 1/4 lambda wave plate and the second 1/2 lambda wave plate are sequentially arranged on the light beam of the laser. The invention further discloses a polarization calibration and compensation method of the polarization laser radar. The polarization calibration and compensation device and method of the polarization laser radar carry out accurate calibration and compensation on the laser radar system, and the polarization influences of an optical system are eliminated.

Description

technical field [0001] The invention belongs to the technical field of polarization detection, and relates to a polarization calibration and compensation device of a polarization laser radar, and also relates to a calibration and compensation method using the device. Background technique [0002] Polarization detection technology has been widely used in imaging lidar and atmospheric lidar. On the basis of active imaging, the imaging laser radar polarization imaging technology makes full use of the polarization information of the laser to obtain more and more accurate target feature information. The obtained polarization images can effectively distinguish metals and non-metals, man-made targets and natural targets, etc. Therefore, the laser radar polarization imaging remote sensing technology has attracted great attention in recent years. When polarized lidar is used to detect atmospheric aerosols, it can be used to distinguish spherical particles from non-spherical particle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/497
CPCG01S7/497
Inventor 狄慧鸽华灯鑫阎蕾洁王玉峰汪丽高飞
Owner XIAN UNIV OF TECH
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