Extracting turbulence information from echo signal of micro-pulse lidar

Zhi-bo Ni; Hong-hua Huang; Hai-ping Mei; Chao-long Cui; Yin-bo Huang; Wen-yue Zhu; Chi-dong Xu; Rui-zhong Rao

doi:10.1117/12.835496

28 August 2009 Extracting turbulence information from echo signal of micro-pulse lidar

Zhi-bo Ni, Hong-hua Huang, Hai-ping Mei, Chao-long Cui, Yin-bo Huang, Wen-yue Zhu, Chi-dong Xu, Rui-zhong Rao

Proceedings Volume 7382, International Symposium on Photoelectronic Detection and Imaging 2009: Laser Sensing and Imaging; 73822L (2009) https://doi.org/10.1117/12.835496
Event: International Symposium on Photoelectronic Detection and Imaging 2009, 2009, Beijing, China

Abstract

Based on the method of measuring turbulence profile with lidar, equations of backscattering speckle sizes induced by aerosol and turbulence are given. According to the relationship between diaphragm aperture and sizes of speckles, fluctuations of normalized variance of echo signal can be separated into dilution regime of aerosol and turbulence, turbulent regime and smoothed regime. The feasibility of measuring turbulent profile with MPL-A1 lidar is discussed, and experiments are performed in horizontal direction. According to the values of SNR and values of normalized variance of echo signal, effective measuring distances of this lidar are determined. The variations of normalized variance and those of calculated results of scintillation index, which are both depending on propagation distance, are compared. Results show that, although the values of normalized variance are only 10 percent of the latter, there is much comparability, especially during nighttime. Temporal variations of normalized variance, which are calculated at 1950m during daytime and at 4500m during nighttime, are compared with those of refractive index structural constant. Analyses show that, the fluctuant ranges of them are all about one magnitude. Although there are a small quantity of time differences between them, total tendencies are comparable.

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Zhi-bo Ni, Hong-hua Huang, Hai-ping Mei, Chao-long Cui, Yin-bo Huang, Wen-yue Zhu, Chi-dong Xu, and Rui-zhong Rao "Extracting turbulence information from echo signal of micro-pulse lidar", Proc. SPIE 7382, International Symposium on Photoelectronic Detection and Imaging 2009: Laser Sensing and Imaging, 73822L (28 August 2009); https://doi.org/10.1117/12.835496

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