典型气溶胶颗粒对激光大气传输的作用机理

Mechanism of Typical Aerosol Particles on Atmospheric Transmission of Laser

气溶胶颗粒影响紫外光通信和红外光通信。选取0.28μm、1.55μm和3.8μm三种波长激光,沙尘、霾、煤烟、雾四种气溶胶颗粒,研究不同种类气溶胶颗粒对激光大气传输的影响。结果表明:复折射率虚部较大的颗粒对入射光能量的吸收不受激光波长影响;复折射率虚部较小的颗粒对0.28μm波长激光有强烈的散射作用,几乎不存在吸收作用。颗粒尺寸影响散射光能量分布,大尺寸颗粒前向和后向散射光能量之差为103~104。在待测颗粒的侧向90°和后向120°散射角位置,探测器便于区分不同尺寸颗粒的散射光能量。该研究有助于理解气溶胶颗粒对激光大气传输的影响。

Aerosol particles affect ultraviolet and infrared optical communication.Three wavelength lasers of 0.28μm,1.55μm and 3.8μm,and four aerosol particles,dust,haze,soot and fog,were selected to study the influence of different aerosol particles on laser atmospheric transmission.The results show that the absorption of incident light energy by particles with large imaginary complex refractive index is not affected by laser wavelength.Particles with a small imaginary complex refractive index have a strong scattering effect on 0.28μm wavelength laser,and there is almost no absorption.The size of aerosol particles affects the energy distribution of scattered light,and the difference between the forward and backward scattered light energy of large-sized particles is 103~104.At the lateral 90°and backward 120°scattering angle positions of the particles to be measured,the detector is convenient to distinguish the scattered light energy of particles of different sizes.The study contributes to the understanding of the effect of aerosol particles on laser atmospheric transport.