The Grating Receiver Technology Experiment Research Of Atmosphere Lidar

The lidar(Light detection and ranging) transmits a laser beam to the atmosphere and detects the backscatter signal of atmospheric particles. Because of its short wavelength, the lidar can detect particles such as atoms and molecules, and remotely sense the atmospheric physical and chemical parameters with high spatial and temporal resolution. So the lidar plays an important role in atmospheric detection. With the development of demanding for the scientific observation and photovoltaic technology advancing, the spectral resolution of the lidar optical receiver system has been further improved. The article uses high‐resolution grating technology to study the the reduction of solar background light of lidar and discrimination of water vapor Raman polychromator.This article introduces the grating types and its principle at first. The research includes Fraunhofer lidar experiment and spectral separation system setting up for the atmospheric water vapor Raman signal detection. In the first part of thesis, according to the Fraunhofer lines and laser emission characteristics, optical receiver with a grating spectrometer is used to probe the atmosphee. The experimental analysis shows that the high‐resolution grating can match the central wavelength and linewidth of the solar Fraunhofer lines and the laser transmitter, therefore the daytime measurement signal‐to‐noise ratio of lidar is able to be improved obviously under the intense background light.In the second part of thesis article, Raman spectral separation system for water vapor detection is introduced, including the principle of water vapor detection using its Raman signal. The grating polychromator system parameters are determined by analyzing expected performance. Optical Software is used to simulate the parameters of polychomator and to determine the major component selection. In the end of this section, the problems and solutions are discussed according to applicaion conditions.