Experimental study on inversion of atmospheric turbulence anisotropy by laser beam spot wander

Ke Xizheng; Li Xin

doi:10.12086/oee.2024.240001

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Ke X Z, Li X. Experimental study on inversion of atmospheric turbulence anisotropy by laser beam spot wander[J]. Opto-Electron Eng, 2024, 51(4): 240001. doi: 10.12086/oee.2024.240001

Citation:

Ke X Z, Li X. Experimental study on inversion of atmospheric turbulence anisotropy by laser beam spot wander[J]. Opto-Electron Eng, 2024, 51(4): 240001. doi: 10.12086/oee.2024.240001

Experimental study on inversion of atmospheric turbulence anisotropy by laser beam spot wander

Ke Xizheng^1,2, ,,
Li Xin^1,

1.
Xi'an University of Technology, School of Automation and Information Engineering, Xi’an, Shaanxi 710048, China
2.
Shaanxi Civil-Military Integration Key Laboratory of Intelligence Collaborative Networks, Xi’an, Shaanxi 710048, China

Fund Project: Project supported by Key Industrial Innovation Project of Shaanxi Province (2017ZDCXL-GY-06-01), and Xi'an Science and Technology Planning Project (2020KJRC0083)

More Information

^*Corresponding author: xzke@263.net

Received Date 02 January 2024

Revised Date 28 February 2024

Accepted Date 01 March 2024

Published Date 25 April 2024

Abstract

Abstract

A real-time image recording system was designed to record spot wander formed by two orthogonal laser beams, and a series of laser beam atmospheric transmission field experiments were conducted to compare the spot wander and study atmospheric turbulence’s anisotropy by inversion. The experimental results show that the atmospheric turbulence near the ground is anisotropic which can be manifested as follows: 1) It is related to the wind direction. A significant difference between vertical wander and horizontal was recorded when the angle between the transmission path and the wind direction was small. When the laser transmission path is orthogonal to the wind direction, vertical wander is basically the same as the horizontal. 2) It is related to real-time temperature. Among the four wander components of two orthogonal laser beams, an uneven distribution of spot wander was found, and temperature decrease increases the intensity of the uneven distribution. Based on the comprehensive analysis of research results, this paper proposes a concept named atmospheric turbulence anisotropy intensity index A which can quantify characteristics and intensity of atmospheric turbulence’s anisotropy.
- laser atmospheric transmission /
- atmospheric turbulence /
- spot wander /
- anisotropy

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References

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Overview

Overview

The transmission characteristics of light waves, especially lasers in turbulent atmospheres, have been extensively explored and studied, among which experimental measurement comparison has become a common method. Traditional atmospheric turbulence theory and related research are mostly based on the isotropy of turbulence, but more and more researchers have found through experimental observations that atmospheric turbulence has anisotropic characteristics in certain scenarios, that is, there are differences in the horizontal and vertical transmission characteristics of light beams transmitted in atmospheric turbulence. Some experiments have shown that atmospheric turbulence anisotropy especially exists in the atmospheric boundary layer near the ground. Among them, experimental research on the differences and changes of laser beam spot wander in the horizontal and vertical directions has received increasing attention Researchers have conducted experimental measurements and research in different scenarios such as near the ground, sea surface, and gobi This paper believes that the refractive index field of atmospheric turbulence is anisotropic, and this characteristic can be inverted and studied through laser beam spot wander. Experimental measurements and comparative studies have been conducted on the wander characteristics of two laser beams in different directions. Previous studies on laser beam spot wander only investigated the wander characteristics of a single laser beam. In this paper, based on the analysis of classical electromagnetic beam propagation theory, the focus is extended to the wander characteristics of two orthogonal laser beams. An experimental system is designed to record the wander characteristics of two orthogonal laser beams, and a research method is proposed to comprehensively compare the wander characteristics of two orthogonal laser beams and invert the atmospheric turbulence anisotropy. The experimental results show that the atmospheric turbulence near the ground is anisotropic which can be manifested as follows: 1) It is related to the wind direction A significant difference between vertical wander and the horizontal was recorded when the angle between the transmission path and the wind direction is small. When the laser transmission path is orthogonal to the wind direction, vertical wander is basically the same as horizontal. 2) It is related to real-time temperature. Among the four wander components of two orthogonal laser beams, an uneven distribution of spot wander was found, and temperature decrease increases the intensity of the uneven distribution Based on the comprehensive analysis of research results, this paper proposes a concept named atmospheric turbulence anisotropy intensity index A which can quantify the characteristics and intensity of atmospheric turbulence's anisotropy.