Integration Scheme Design And System Implementation Of Raman Lidar All-fiber Spectroscopic For Atmospheric Temperature Measurement

Atmospheric temperature is one of the important atmospheric meteorological parameters for studying the weather forecast, atmospheric science, environmental change and climate change have a vital role, so the research of the space-time evolution of atmospheric temperature is particularly important. Land-based rotational Raman scattering lidar as a new type of atmospheric temperature detection methods have been widely used in meteorology,environmental protection, military, scientific research and other fields. For the spacebome detection requirements, the lightweight, miniaturization and low power consumption all-fiber rotational Raman temperature lidar spectroscopic system integration method as the research object, on the basis of the early stage of the research study, Combined with the finite element analysis method, temperature response of the fiber Bragg grating(FBG) was studied in the all-fiber rotational Raman spectroscopy system; all-fiber rotational Raman system integration scheme design and system implementation were . completed; and passive temperature compensation of the high quantum number channel FBG was achieved. The main work and research results are as follows:Relying on the early stage of the research of all-fiber rotational Raman lidar spectroscopy system, using the finite element analysis method, the selection of FBG substrate material and structure design of wavelength tuning were completed; the temperature response experiment system of all-fiber rotational Raman spectroscopy system was set up; the high and low quantum number channel FBG wavelength offset relations with the temperature changing was studied.Based on the above research results, numerical simulation analyzed the high and low quantum number channel FBG wavelength offset caused by the environmental temperature change to the influence of atmospheric temperature inversion accuracy.Combining with design spectral system structure which combined optical, mechanical and electrical, adopting finite element analysis method, the frequency response and impact response of the all-fiber rotational Raman spectroscopic system structure were studied. A temperature control system based on programmable loop controller was designed; the temperature control precision that experiment measured of temperature control system is ± 0.1?. In the verification experiments, the matching wavelength correspond to the rotational Raman quantum number can be accurately extracted by using the integrated system.Finally, for the lightweight and miniaturization of space-borne lidar, the passive temperature compensation scheme of FBG based on heterogeneous table paste materials was proposed and the feasibility of the scheme was verified by finite element method and experiment system, the passive temperature compensation of FBG the high and low quantum number channel was achieved.