Signal Detection And Retrieval Algorithm For Rotational Raman Temperature Lidar Of Absolute Remote Sensing

Atmospheric temperature, which is one of the important parameters of the atmospheric state, solar radiation, atmospheric humidity, atmospheric pressure, andaltitude is closely related to atmospheric physics, is an important meteorological parameter for weather analysis and prediction and environmental monitoring. A rotational Raman lidar has become one of valid methods of atmospheric temperature. However, its proper operation generally needs a certain collocated device of atmospheric temperature to calibrate three retrieval coefficients.This fact seriously restricts the applications of rotational Raman lidar in the meteorology and environment fields. Therefore, in order to promote the Raman lidar in the practical process of atmospheric temperature measurement process, we put forward without the aid of other rotational Raman lidar parallel calibration equipment absolute detection method that provides an effective way for detecting atmospheric temperature measurement and calibration.Firstly, in this paper, from the atmospheric molecular scattering principle, we get through analysis of the measuring principle of Raman scattering and match a functions to replace air molecules of envelope rotational Raman scattering cross section strength obeys the Rayleigh distribution Boltzmann function to improve the use of multiple (more than 2) defects of rotational Raman spectrum inversion of atmospheric temperature efficiency is not high enough,the Rayleigh function method extracted by extracting Raman spectra and rotational Raman spectrum of the Boltzmann distribution function method has better consistency. Secondly,optimizing the construction of grade two multichannel Raman lidar with blazed grating and fiber Prague grating as the core of the optical system, the processing is developed so that the nitrogen molecular anti-Stokes even quantum number spectrum and optical fiber array spacing between the lines in the fiber cladding diameter (125 ?m) linear optical fiber array matching.Again, in order to eliminate and avoid crosstalk near the channel of nitrogen and oxygen molecules of Raman spectra to rotational Raman spectrum signal extraction, the final selection to J=6,10,12,16,20,22 these six lines to the retrieval atmospheric temperature profile, and through analyzing a series of experiments, the feasibility of linear optical fiber array for extraction of rotational Raman spectrum the design verification, analyzes the factors that influence the quality of various kinds of fiber array.Finally, the design of multi channel matching with the optical fiber array (more than 2) of the photovoltaic array, to facilitate the realization of imulti-channel (more than 2) synchronous photoelectric signal conversion, data acquisition and pave the way for the inversion of atmospheric temperature in the future.In this paper, we get through study the signal detection and retireval algorithm of the rotational Raman lidar system, this method provides a new way for the construction of rotational Raman lidar system, and also offers a new means for the detection of rotational Raman temperature.