UV HIGH-SPECTRAL-RESOLUTION LIDAR FOR ABSOLUTE MEASUREMENT OF AEROSOL EXTINCTION COEFFICIENT AND LIDAR-RATIO

摘要

An ultraviolet high-spectral-resolution lidar (UV HSRL) has been developed for measuring atmospheric optical parameters such as the aerosol extinction coefficient and the lidar ratio. Measurement of absolute value of the atmospheric optical parameters without assuming typical aerosol model is possible in this system. The system employs an injection seeded tripled Nd:YAG laser at eye-safe ultraviolet wavelength of 355nm and a Fabry-Perot interferometer as a high-spectral-resolution filter. High-spectral-resolution technique is used for separating the Mie and the Rayleigh backscattering in the received signal. The measurement accuracy of the aerosol extinction coefficient was 1.6 x 10~(-2)km~(-1) at 5km range with 10~4 laser shot averaging and 700m range resolution.