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激光引信在降雨中工作时会受到雨滴的散射和衰减效应,使光束质量变差,回波能量减小,从而影响探测系统的性能。以蒙特-卡罗方法为基础,给出了激光在降雨中的传输模型,分析不同模拟条件下光束的扩展特性,并进行实验测试。由仿真分析可知,雨滴对光束的散射作用导致光斑扩散,从而光束能量密度减小,并且随着降雨强度、传输距离和光束发散角的增大,光子散射次数增多,光斑直径扩大,到达接收面的光子减少,光束能量衰减。实验测试结果与仿真计算基本一致,最大误差不超过4%,很好地验证了模型的准确性。
Laser fuze will be affected by the scattering and attenuation effects of raindrops when working in the rain, which will deteriorate the beam quality and reduce the echo energy, thus affecting the performance of the detection system. Based on the Monte-Carlo method, the laser transmission model in the rain is given, and the expansion characteristics of the beam under different simulation conditions are analyzed and tested. From the simulation analysis, it can be seen that the scattering effect of raindrops on the light beam causes the light spot to diffuse and the energy density of the light beam to decrease. With the increase of rainfall intensity, transmission distance and beam divergence angle, the number of photon scattering increases and the spot diameter expands to reach the receiving surface Photon reduction, beam energy attenuation. The experimental test results are basically the same with the simulation calculation, the maximum error is less than 4%, which verifies the accuracy of the model.