Design and Performance Testing of Long-Optical-Path Atmospheric Turbulence Simulator

Yingfa, 吴应发 Wu; Xuanbing, 邱选兵 Qiu; Chuanliang, 李传亮 Li; Jinhong, 李晋红 Li; Jilin, 魏计林 Wei

doi:10.3788/cjl201542.0413004

Cited by 2 publications

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“…and a collimating mirror. The closed local air turbulence simulation device simulates atmospheric turbulence based on the similarity theory of air flow 20 . The lower panel of the device is the heating surface and the upper panel is the cooling surface.…”

Section: Experimental Systemmentioning

confidence: 99%

“…The closed local air turbulence simulation device simulates atmospheric turbulence based on the similarity theory of air flow. 20 The lower panel of the device is the heating surface and the upper panel is the cooling surface. By adjusting the temperature difference between the upper and lower panels of the device, the simulation of atmospheric turbulence of different intensities is realized.…”

Section: Experimental Systemmentioning

confidence: 99%

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Experimental study on laser propagation characteristics in local air turbulence disturbed by coherent acoustic waves

Wang

2022

Opt. Eng.

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.The existence of atmospheric turbulence seriously restricts the application of laser technology. However, the acoustic wave will affect the air density during the propagation process, change the original structure of the air turbulence, and then affect the propagation of the laser in the air turbulence. To study the effect of disturbance of atmospheric turbulence by acoustic waves on laser propagation, the propagation characteristics of lasers in local atmospheric turbulence under coherent acoustic wave perturbation are investigated experimentally. First, a coherent acoustic wave generator and a closed local air turbulence simulation device are designed. The propagation experiments of laser in a closed local air turbulence environment disturbed by coherent acoustic waves are carried out. It is found that the coherent acoustic wave will interfere with the wave reflected from the inner wall of the closed local air turbulence simulation device, and the sound pressure forms a regular standing wave intensity distribution pattern. Moreover, the variations of laser beam drift fluctuation variance, scintillation index, and beam diameter with coherent acoustic wave frequency, power, and sound source array position are studied. The results show that the original structure of air turbulence will be changed in the process of coherent acoustic wave propagation, which will affect the beam drift fluctuation variance, scintillation index, and beam diameter changes of laser propagation in air turbulence. The beam drift fluctuation variance, scintillation index, and beam diameter change regularly with the change of the frequency and power of the sound source. Changes of the fluctuations with frequency are relatively gentle, whereas changes with power are severe. This paper explores the influence of coherent acoustic waves disturbing air turbulence on laser propagation characteristics, and the research results provide a basis for improving or disturbing laser propagation performance in atmospheric turbulent environments.

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Section: Experimental Systemmentioning

confidence: 99%

Section: Experimental Systemmentioning

confidence: 99%

Experimental study on laser propagation characteristics in local air turbulence disturbed by coherent acoustic waves

Wang

2022

Opt. Eng.

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基于波长调制腔增强吸收光谱技术的co体积分数测量

Wang Xuan,

Gao Guangzhen,

Long Fangyu

et al. 2023

中国激光

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Objective Based on cavityenhanced absorption spectroscopy (CEAS) and wavelength modulated spectroscopy (WMS) technology, a cavityenhanced spectrum measurement system was built to measure the volume fraction of CO gas. In an experiment, a distributed feedback laser (DFB) laser with a central wavelength of 2.3 µm was used as the light source, and an optical cavity with a base length of 30 cm was constructed with two highly reflective mirrors with a reflectivity of 99.8%. An effective absorption path of 147.15 m was achieved. On this basis, CO was detected using the CO absorption spectral line at 4297.705 cm -1 as the sensing target.

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Design and Performance Testing of Long-Optical-Path Atmospheric Turbulence Simulator

Cited by 2 publications

References 0 publications

Experimental study on laser propagation characteristics in local air turbulence disturbed by coherent acoustic waves

Experimental study on laser propagation characteristics in local air turbulence disturbed by coherent acoustic waves

基于波长调制腔增强吸收光谱技术的co体积分数测量

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