Simulated depolarization ratios for dust and smoke at laser wavelengths: implications for lidar application

• DOI: 10.1364/oe.484335
• Publication Date: 2023-02-27T03:00:06Z
• Authors: Zhongwei Huang; Xingtai Shen; Shihan Tang; Tian Zhou; Qingqing Dong; Shuang Zhang; Meishi Li; Yongkai Wang
• Keywords: Depolarization ratio; Molar absorptivity; Angstrom exponent; Effective radius

Polarization measurements have been widely used to detect aerosol properties by remote sensing in recent decades. To better understand the polarization characteristics of aerosols lidar, numerically exact T-matrix method was simulate depolarization ratio (DR) dust and smoke at typical laser wavelengths this study. The results show that DRs obviously different spectral dependences. Moreover, two has an obvious linear relationship with microphysical aerosols, including aspect ratio, effective radius complex refractive index. At short wavelengths, we can use it invert absorption particles, further improving detection ability lidar. Comparing simulation channels, DR, (color ratio) CR (lidar LR a good logarithmic fitting 532 nm 1064 nm, which helps classify types. On basis, new inversion algorithm, "1β+1α+2δ", presented. By backscattering coefficient (β), extinction (α), DR (δ) be expand range compare lidar data configurations obtain more extensive optical aerosols. Our study enhances application observations accurately.