探测大气湍流的光强闪烁激光雷达

基于残余光强闪烁理论, 分析了与大气湍流探测有关的激光雷达各项硬件参数并获得参数的优化范围, 据此研制了一台用于大气湍流探测的光强闪烁激光雷达。背景基线、线性特征等性能测试表明, 激光雷达各硬件工作正常, 数据获取可靠。实验测量中获得了水平方向上闪烁指数和大气折射率结构常数随探测距离和时间的变化趋势, 其中闪烁指数在450~2000 m探测距离范围内由0.001逐渐增大至0.350左右; 大气折射率结构常数基本保持水平均匀性, 在1.0×10-16~1.0×10-15m-2/3范围之内; 大气折射率结构常数在10:00~21:00时间内大致呈现上午上升、下午下降、晚上上升的变化趋势, 具有较明显的日变化特征。实验结果与理论和常规测量较为相符, 表明光强闪烁激光雷达能够获取大气湍流的探测距离变化和日变化特征信息。

Abstract

Based on residual turbulent scintillation(RTS) theory, many lidar component parameters were analyzed, and the ones related to atmospheric turbulence detecting were obtained and optimized. An RTS lidar was then developed for acquiring atmospheric turbulence information. It is suggested that the lidar works normally and the data are reliable according to some performance tests of baseline, linearity characteristic and so on. The relationships of scintillation index and atmospheric refractive index structure constant with propagation distance and time in horizontal direction were experimentally obtained. The scintillation index increases from 0.001 to 0.35 with the propagation distance changing from 450 m to 2000 m, and the refractive index structure constant is between 1.0×10-16 and 1.0×10-15 m-2/3 and basically maintains homogenous in that distance range. From 10:00 am to 09:00 pm, the refractive index structure constant rises in the morning, falls in the afternoon and then rises in the evening approximately. On the whole, the variations of scintillation index and refractive index structure constant with propagation distance and time are similar to the theoretical results and practical measurements. The results suggest that the RTS lidar has the capability of extracting atmospheric turbulence information that varies with propagation distance and time in the lidar echo signal.

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崔朝龙, 黄宏华, 梅海平, 朱文越, 饶瑞中. 探测大气湍流的光强闪烁激光雷达[J]. 强激光与粒子束, 2013, 25(5): 1091. Cui Chaolong, Huang Honghua, Mei Haiping, Zhu Wenyue, Rao Ruizhong. Turbulent scintillation lidar for acquiring atmospheric turbulence information[J]. High Power Laser and Particle Beams, 2013, 25(5): 1091.

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