Atmosphere laser remote sensing method based on polarization modulation and polarization laser radar

A polarization modulation and atmospheric technology, applied in the field of gas laser remote sensing, can solve the problems of high cost, complexity, and inability to realize real-time measurement, and achieve the effects of real-time accurate measurement, low cost, and simple system structure.

Active Publication Date: 2018-10-02
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

However, the above two types of polarization lidar systems are relatively complex. The first type of polarization lidar requires two sets of detection and information acquisition devices, which are expensive, and the fluctuation of the efficiency of different detectors will affect the measurement of the depol

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  • Atmosphere laser remote sensing method based on polarization modulation and polarization laser radar
  • Atmosphere laser remote sensing method based on polarization modulation and polarization laser radar
  • Atmosphere laser remote sensing method based on polarization modulation and polarization laser radar

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Embodiment Construction

[0023] Aiming at the deficiencies of existing polarization laser radars, the solution of the present invention is to use a specially designed polarization-modulated optical signal as the detection light; the backscattered light of the target to be measured contains two paths of orthogonally polarized echo signals, respectively carrying a carrier wave and a positive signal. First order sideband signal. In this way, at the receiving end, only one detector needs to be used to detect the reflected echo, and by measuring the frequency and power of the beat frequency electrical signal in the echo signal, the wind speed information and depolarization ratio information in the atmosphere can be measured in real time at the same time.

[0024] Specifically, the atmospheric laser remote sensing method based on polarization modulation proposed by the present invention is as follows:

[0025] At the transmitting end, the single-frequency microwave signal is polarization-modulated on the op...

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Abstract

The invention discloses an atmosphere laser remote sensing method based on polarization modulation and polarization laser radar. According to the invention, by use of specially designed polarization modulation light signals as detection light, back scattering light of a to-be-detected target includes two paths of orthogonal polarization echo signals and respectively carries carriers and positive first-order sideband signals. Thus, a receiving end detects reflection echoes only by use of a detector. By measuring frequency and power of beat frequency electrical signals in the echo signals, real-time measurement can be performed on wind speed information and depolarization ratio information in the atmosphere simultaneously. The invention discloses a polarization laser radar. Compared with theprior art, by ingeniously designing detection of optical signals, it can be achieved that real-time accurate measurement can be performed on wind speed and depolarization effects of to-be-detected atmosphere; only one set of detectors can be required; and the system structure is quite simple and the achieving cost is quite low.

Description

technical field [0001] The invention relates to an air laser remote sensing method, in particular to an atmospheric laser remote sensing method based on polarization modulation. Background technique [0002] The atmosphere is the guarantee for the survival of human beings. Changes in the state of the atmospheric environment have a direct and important impact on human activities. Therefore, it is of great scientific and practical significance to detect and study the atmosphere. According to detection methods, atmospheric detection is divided into three types: visual detection, direct detection, and remote sensing. The so-called atmospheric remote sensing refers to the detection carried out without direct contact between the detection instrument and the measured atmosphere. Remote sensing detection releases the position dependence of the detection instrument and the limitation of the detection range, so that the instrument can simultaneously measure a large range of atmospher...

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Application Information

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IPC IPC(8): G01S17/95G01S7/481G01S7/487G01S7/493G01S7/497
CPCG01S7/481G01S7/487G01S7/493G01S7/497G01S17/95Y02A90/10
Inventor 徐忠扬张洪祥潘时龙陈凯薛敏王祥传
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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