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Self-calibration polarization atmospheric laser radar device and method

A laser radar and self-calibration technology, applied in the application field of laser spectroscopy technology, can solve the problems of complex and cumbersome gain ratio calibration, and achieve the effects of simple structure, convenient operation and low cost

Pending Publication Date: 2020-05-08
DALIAN UNIV OF TECH
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Problems solved by technology

[0010] The purpose of the present invention is to provide a self-calibrating polarized atmospheric lidar device and method to solve major problems such as complex and cumbersome calibration of the gain ratio of traditional polarized atmospheric lidar systems

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  • Self-calibration polarization atmospheric laser radar device and method
  • Self-calibration polarization atmospheric laser radar device and method
  • Self-calibration polarization atmospheric laser radar device and method

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Embodiment Construction

[0033] The specific implementation manners of the present invention will be further described below in conjunction with the accompanying drawings and technical solutions.

[0034] It should be understood that the appended drawings are not to scale, presenting a convenient simplified representation of various features illustrative of the basic principles of the invention. The specific design features of the invention disclosed herein, including, for example, specific dimensions, orientations, locations and shapes will be determined in part by the particular intended application and use environment.

[0035] (1) Basic concepts

[0036] Polarization mismatch angle θ: the angle between the plane where the polarization state of the diode laser emits laser light and the plane where the polarization state of the camera's 0° channel in the receiving optical path is located.

[0037] Volume depolarization ratio δ v : the ratio of the total backscatter coefficient of the perpendicular...

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Abstract

The invention belongs to the technical field of laser spectrum technology application, and provides a self-calibration polarization atmospheric laser radar device and a method, and the device comprises a laser, a linear polaroid, a laser transmitting device, a laser receiving device, a narrow-band optical filter, and a polarization area-array camera. According to the method, on the premise of notadditionally adding an optical element, atmospheric backscattering signals of four polarization states are obtained at the same time, atmospheric echo signal detection equations of the four polarization states are constructed, an accurate body depolarization ratio deltav and an accurate polarization mismatch angle theta are obtained in real time through a nonlinear least square method, and the problem that gain ratio calibration of a traditional dual-channel polarization laser radar system is complex is solved. The device has the characteristics of simple structure, convenience in operation, low cost, high reliability and the like.

Description

technical field [0001] The invention belongs to the technical field of application of laser spectrum technology, and in particular relates to a self-calibrating polarized atmospheric laser radar device and method for detecting the form of atmospheric particles. Background technique [0002] Atmospheric Lidar (Light Detection and Ranging, Lidar) technology is an active optical remote sensing technology with unique advantages such as high temporal and spatial resolution, superior directivity and coherence, and real-time monitoring. Polarized atmospheric lidar emits high-purity linearly polarized light into the atmosphere, and identifies important information such as the phase of clouds (ice clouds and water clouds), aerosol forms, etc. based on the detected depolarization signals. When polarized light is incident on spherical particles (high-altitude clean air molecules), its backscattered light is still linearly polarized light; when polarized light is incident on non-spheric...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/95G01S7/497G01S7/481
CPCG01S17/95G01S7/497G01S7/481Y02A90/10
Inventor 梅亮孔政
Owner DALIAN UNIV OF TECH
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