Backscattering polarization characteristics of pulsed laser fuze with coaxial optical system in water fog

The performance of laser fuze is vulnerable to be scattered and absorbed by atmospheric aerosols while it propagates in atmosphere. In this work, the backscattering polarization characteristics of a pulsed laser in water fog were researched by using Mie scattering theory and Monte Carlo simulation. By simulating 19 kinds of fog particles with diameters of 1-10 μm, the Mean Contrast of Polarization (MCOP) of backscattering laser was obtained for typical wavelengths and diameters. An experimental system for the backscattering polarization characteristics of a coaxial pulsed laser was established in water fog. Five kinds of man-made fog particles with different diameters were obtained by changing the concentration of an ultrasonic humidifier. The man-made fog particles were measured experimentally, and the results show when fog particle diameters are in 1-10 μm, the MCOP of laser backscattering is from 0.30 to 0.65. Experimental results agree well with the simulation data, thus verify the validity of laser backscattering theory model and Monte Carlo simulation, and provide a method for laser fuze anti-interference of clouds and fogs.