Basic Study On A Co-path Doppler Asymmetric Spatial Heterodyne Spectroscopy Interferometer With Two Fields Of View For Atmospheric Wind Vector Observation Form Satellite Platforms

Doppler asymmetric spatial heterodyne spectroscopy (DASH) interferometer which is based on spatial heterodyne spectroscopy (SHS) is an innovative concept for atmospheric wind observations. Compare to the conventional concept such as the Fabry-Peort interferometers and the wide-angle Michelson interferometers, it has no moving parts, compact, lightweight, relaxed fabrication and alignment tolerances and can measure multiple emission lines simultaneously, making it suitable for satellite platforms.Research on a Doppler asymmetric spatial heterodyne spectroscopy interferometer using Kosters prism with two fields of view for atmospheric wind vector observation from satellite platforms are presented in this thesis. Based on the SHS, the theory of DASH is introduced firstly. The interference fringe space frequency formula is proved. The relation of the path offset to the phase at x=0 is deduced. The interferometer instrument performance such as spectral range, resolution limit and spectral resolution are analyzed. The principle of Doppler asymmetric spatial heterodyne spectroscopy interferometer for wind observation is introduced.Secondly, study on how to accomplish wind vector observation with the new interferometer system are presented. A pupil matching relation between the optical systems in the DASH system is proposed. Based on the conventional methods, an approach which introduces cylindrical lens into the image system suitable for the DASH system to measure the wind with orthogonal look direction is proposed. Beside, the device has vertical direction spatial resolution.Thirdly, study on the design of system with Kosters prism is presented. An exact relation of the path offset to Littrow angle and the apex angle of Kosters prism is derived. A system for observation of the O[1D]630nm emission form satellite is designed to show the process and result of parameters optimizing. The systern can measure the emission form 230 km to 270 km and the Vertical direction spatial resolution is 0.4km.Finally, a simulated result for the system indicate that the co-path DASH interferometer with two fields of view has space resolution ability in one dimension, it can get the interference fringe at different elevations in two directions without scanning parts and it is possible to obtain the wind vector for the same volume with the help of satellite’ moving.