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介绍了米氏(Mie)散射理论,设计了基于米氏散射理论的云粒子探测器。该探测器使用685nm的二极管激光器照亮敏感区域的云滴粒子。光学接收部分分为前向散射和后向散射两部分,前向散射接收云粒子立体角在4°~12°的散射而后向散射接收126°~134°之间的能量。根据前向散射信号的强度可以确定云滴粒子尺寸,云粒子尺寸确定后,可以利用前向散射和后向散射的比值推断被测云粒子的相态。利用米氏散射理论计算了云粒子散射能量强度随粒子尺寸的变化和前、后向散射能量比随云粒子折射率的变化。
The Mie scattering theory is introduced and a cloud particle detector based on Mie scattering theory is designed. The detector uses a 685nm diode laser to illuminate cloud droplets in sensitive areas. The optical receiving part is divided into two parts: forward scattering and backscattering. The forward scattering receives the scattering energy of the solid angle of cloud particles between 4 ° and 12 ° and the backward scattering receives the energy between 126 ° and 134 °. According to the intensity of the forward scattering signal, the particle size of cloud droplets can be determined. After the cloud particle size is determined, the phase state of cloud particles can be inferred by the ratio of forward scattering and backscattering. Using the Mie scattering theory, the intensity of scattering energy of a cloud particle as a function of the particle size and the change of the energy ratio of the front and back scattering with the refractive index of the cloud particle were calculated.