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大气中的分子和气溶胶对紫外光具有强烈的散射作用,因此紫外光在大气中可实现非视距传输。在紫外探测中,收发端的距离较近,为了研究探测过程中紫外光的传输特性,通过蒙特卡罗方法建立多次散射模型,并采用指向概率法对模型进行优化。在收发端轴线共面以及非共面的情况下,对探测到的脉冲响应以及能量密度进行仿真分析,并针对不同大气条件进行仿真。仿真结果表明:紫外激光探测与远距离目标探测不同,偏转角对近距离目标探测的影响较大;在散射系数和吸收系数较大时,收发端距离较近目标的回波信号较强。由仿真结果可以得到紫外光在大气中的传输特性,为今后紫外激光探测的具体设计提供了理论依据。
Atmospheric molecules and aerosols have a strong scattering effect on UV light, so UV light in the atmosphere to achieve non-line-of-sight transmission. In the UV detection, the distance between the sending and receiving ends is relatively close. In order to study the transmission characteristics of UV light in the detection process, a multi-scattering model is established by Monte Carlo method and the model is optimized by the method of point-to-point probability. In the case of coplanar and non-coplanar transmission and reception axes, the simulated impulse responses and energy densities were simulated and simulated under different atmospheric conditions. The simulation results show that the UV laser detection is different from the long-range target detection, the deflection angle has a greater impact on the near-target detection; when the scattering coefficient and the absorption coefficient are larger, the echo signal closer to the receiving and sending end is stronger. The simulation results can be obtained in the atmosphere of ultraviolet light transmission characteristics for the future UV laser detection of the specific design provides a theoretical basis.