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温度场起伏导致空气折射率的起伏,风速的变化影响湍流的动态特性,从而形成光学湍流效应,对大气激光传输产生影响。研制了一种用于研究激光大气传输效应的Herriott长光程大气湍流发生装置,此装置能模拟出温度差范围为10~200℃,风速范围为0~5.8 m/s以及光程为1~100 m的随机大气湍流。分析并测量了在不同温度、风速参数下该装置对激光传输的光束质量影响。实验结果表明,该大气湍流发生装置的性能指标与实际大气湍流性能较为接近,且具有温度范围宽、光程可调、重复性好、准确度高等优点,能够满足大气传输湍流效应的实验要求。
The fluctuation of the refractive index of the air caused by the fluctuation of the temperature field affects the dynamic characteristics of the turbulent flow and thus forms an optical turbulence effect that affects the atmospheric laser transmission. A Herriott atmospheric long-path atmospheric turbulence generator was developed to study the laser atmospheric transmission effect. The device can simulate the temperature difference between 10 ~ 200 ℃, the wind speed range of 0 ~ 5.8 m / s and the optical path length of 1 ~ Random atmospheric turbulence of 100 m. The laser beam quality under different temperature and wind speed parameters was analyzed and measured. The experimental results show that the performance of the atmospheric turbulence generating device is close to the actual atmospheric turbulence performance, and has the advantages of wide temperature range, adjustable optical path, good repeatability and high accuracy, and can meet the experimental requirements of atmospheric turbulence transfer.