Abstract

The intensity distribution of scattered radiation over the transmitting–receiving aperture of a turbulent lidar is experimentally studied. Sounding was performed along a horizontal path under moderate turbulence with a narrow laser beam located in the center of the receiving aperture of variable size. The relative contribution to the echo signal due to turbulence decreased as the receiving aperture increased. The BSE effect was found to be localized at the center of the receiving aperture: the peak of scattered radiation is located at the axis of the sounding beam, and its size is approximately equal to the beam size; at the periphery, the average intensity of scattered radiation slowly decreased to background values as the distance from the beam axis increased. The result can be used in practice for optimal choice of transceiver parameters when designing a turbulent lidar.

中文翻译：

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反向散射增强峰的实验估算

摘要

实验研究了湍流激光雷达的发射-接收孔径上的散射辐射强度分布。在中等湍流下沿水平路径进行测深，同时窄激光束位于可变尺寸的接收孔的中心。湍流对回波信号的相对贡献随着接收孔径的增加而减小。发现疯牛病效应位于接收孔的中心：散射辐射的峰值位于探测波束的轴上，其大小大约等于波束大小。在外围，随着距光束轴的距离增加，散射辐射的平均强度逐渐降低至背景值。