油雾扩散过程中浓度对偏振激光传输特性的影响

针对大气环境中粒子浓度对激光传输过程的影响问题，以油雾粒子为研究对象，利用油雾粒子在扩散过程中产生的非均匀环境，进行了偏振激光传输的半实物仿真实验。实验采用532 nm激光器，分别研究了水平线偏振光、45°线偏振光以及左旋圆偏振光在油雾扩散过程中偏振态的变化情况。利用粒度仪对扩散环境进行了量化标定。实验结果表明:在油雾扩散过程中，浓度越高，偏振度变化的随机性越大，圆偏振光的保偏性优于线偏振光。在相同浓度下，0°线偏振光对偏振态的保持性要优于45°线偏振光。在浓度极高的情况下，体积浓度为2 mg/L及其以上时，线偏振光与圆偏振光的保持性趋向一致。

Effect of concentration on propagation characteristics of polarized laser in oil-mist diffusion

Aiming at the influence of particle concentration on the laser transmission process in the atmospheric environment, taking the oil mist particles as the research object, the semi-physical simulation experiment of polarization laser transmission was carried out by using the inhomogeneous environment generated by the oil mist particles during the diffusion process. In the experiment, 532 nm lasers were used to study the polarization state variation of horizontal linearly polarized light, 45° linearly polarized light and left circularly polarized light during oil mist diffusion. The diffusion environment was quantitatively calibrated using the particle size analyzer. The experimental results show that the higher the concentration is, the greater the randomness of the change of polarization, and the polarization-maintaining ability of the circularly polarized light is better than that of the linearly polarized light. At the same concentration, the polarization-maintaining ability of 0°linearly polarized light is better than 45 ° linearly polarized light. In the case of extremely high concentrations, when the volume concentration is 2 mg/L or above, the linearly polarized light tends to coincide with the retention of circularly polarized light.