大气光学湍流廓线探测方法研究进展

摘要/Abstract

摘要： 激光在大气传输过程中, 由于湍流折射率的随机起伏会引起波前畸变、光斑漂移、闪烁等一系列光学湍流效应, 因此严重制约了遥感成像系统和激光通信技术的发展。通过分析大气光学湍流对多个领域的影响, 指出了探测大气光学湍流廓线的重要意义。要想获取光学湍流的时空分布规律并准确评估光学湍流对光学成像或激光传输系统的影响, 就必须对光学湍流进行准确的测量。以光学湍流特征参数为视角, 介绍了目前国内外探测大气湍流廓线分布的方法和研究进展, 总结了各技术方法的测量原理及优缺点。最后对拟开展的差分波前激光雷达探测大气湍流廓线的方法进行了简要介绍, 该技术具有空间分辨率高且不存在聚焦焦移的探测优势。初步的仿真研究结果表明该雷达系统对大气光学湍流廓线的探测具有可行性。

关键词: 大气湍流廓线, 温度起伏, 折射率起伏, 激光雷达, 湍流效应

Abstract: When laser propagates in the atmosphere, the refractive index fluctuation caused by atmospheric turbulence will lead to optical turbulence effects such as wavefront aberration, beam wander, and scintillation, which severely restrict the development of remote sensing imaging systems and laser communication. Because of the influence of atmospheric optical turbulence on many fields, it′s significant to measure optical turbulence profile. To obtain the temporal and spatial distribution of optical turbulence and evaluate the impact of optical turbulence on optical imaging and laser transmission systems require accurate measurement of optical turbulence. From the perspective of optical turbulence characteristic parameters, the current retrieval methods and research progresses of measuring atmospheric turbulence profile distribution at home and abroad are introduced, and the measurement principles, advantages and disadvantages of the different technologies are summarized. Finally, the new lidar system, named differential wavefront lidar, is presented, and its measurement principle is also introduced. The technology has the advantages of high spatial resolution and no focal shift. The preliminary simulation results of echo signal show that this technology can effectively measure the atmospheric optical turbulence profile

Key words: turbulence profile, temperature fluctuation, refractive index fluctuation, lidar, turbulence effects

中图分类号:

P427.1

王彩玉, 苑克娥, ∗, 时东锋, 黄见, 杨威, 查林彬, 朱文越, . 大气光学湍流廓线探测方法研究进展[J]. 大气与环境光学学报, 2021, 16(1): 2-17.

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