Study of Double-Wavelength Airborne Lidar System Based on Ocean Red Tide Monitoring

Am at monitoring and forecasting the red tide in real time, an double-wavelength airborne lidar system is proposed in this paper. The lidar system not only can use a infrared laser to detect the seawater scattering signal and gain the information about the red tise´s density and size, but also can use a blue-green laser to detect the Brillouin scattering signal and deduce the temperature and salinity of the seawater.The infrared scattering signal can be detected by the infrared filter, at the sametime, the Brillouin scattering signal can be detected by a bromine molecule absorption cell and an iodine molecule absorption cell. Through simulating and analyzing the absorption spectrum of molecule absorption cell, it can gain the data of the laser center frequency, the laser monochromatic and stable frequency indexes, and the absorption spectrum of all filters in the system. The results show that our research can be used as forming the practical double-wavelength airborne lidar system.