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脉冲激光在烟雾中的传输特性仿真流程如图3所示。首先在激光后向散射模型中输入试验中的相关参数,对光子状态进行初始化设置,光子与粒子发生碰撞之后,计算光子的位置与能量,若光子在烟雾范围内且光子未消失,则重复碰撞过程,直到光子消失或被引信接收,进行新的光子碰撞。当最后一个光子完成循环之后,计算出激光回波归一化强度。
对仿真条件进行设置,仿真分为两组。一组为相同距离下,回波强度随质量浓度和烟筒长度的变化;另一组为相同烟筒长度下,回波强度随质量浓度和距离的变化。仿真条件如表1所示。
Parameters Value Laser fuze Wavelength/nm 905 Pulse width/nm 50 Beam divergence/rad 0.005 Receiving optical lens diameter/mm 50 Emission-receiving distance/mm 35 Receiving field angle/rad 0.2 Smoke Density/g·cm−3 1.096 Complex index of refraction 1.750-0.430i Particle size/μm 3-26 Parameters of tests Concentration of smoke/ g·m−3 3、7、10.5、14、18、21、24、28 Length of pipe/m 0.3、0.5、0.8、1.0 Distance of fuze and smoke/m 0.5、1.0、1.5、2.0、2.5、3.0 Table 1. Settings in simulation
Study on backscattering characteristics of pulsed laser fuze in smoke
doi: 10.3788/IRLA202049.0403005
- Received Date: 2020-02-08
- Rev Recd Date: 2020-03-15
- Publish Date: 2020-04-24
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Key words:
- pulsed laser fuze /
- smoke /
- Mie scattering /
- Monte Carlo /
- backscattering characteristics
Abstract: The detection ability of laser fuze is easily disturbed by smoke, which causes false alarm. In order to study on the backscattering characteristics of pulsed laser fuze in smoke, the relevant model based on Mie scattering theory and Monte Carlo method was established, and the backscattering signal in smoke was simulated using 905 nm pulsed laser. To verify the accuracy of the model, the actual peak voltage was compared with the simulated normalized intensity and correlation analysis was conducted. Then, the backscattering characteristics of the pulsed laser fuze under different smoke concentrations, length of pipes and distances were analyzed. Finally, the influence of different smoke environment was obtained. The results can provide support for the anti-smoke interference of the pulsed laser fuze.