Study On The Beam Splitting Technology Of The Imaging Spectroscopy

The beam splitting technologies of imaging spectroscopy and their application are studied in this thesis, including:1. The beam splitting technologies of imaging spectrometers are classified. The developments of imaging spectrometers are introduced. The beam splitting technologies which are widely applied into dispersive imaging Spectrometry and Fourier transform imaging Spectrometry are elaborated, and the applications are introduced. The developing trends of the imaging spectrometers are analyzed from the view of new technologies.2. The basic principles of Fourier-transform imaging Spectrometry are introduced. The principle of interference, instrumental line shape function, resolution, apodization and the principle of sampling are elaborated. The main merits of Fourier imaging spectrometers are concluded.3. The merits and applications of several temporarily modulated Fourier-transform imaging spectrometers, which use rotary mirrors, are introduced. A new kind of ultra-rapid-scanning imaging spectrometer based on Griffiths' is provided. The derivation of its optical path difference is elaborated, and the ultimate formula is given. The formula of the optical path difference is recalculated by setting several related parameters. The schematic diagrams of the curves of optical path difference are presented. The contributions of the parameters is compared and discussed.4. The principles of spatially modulated Fourier-transform imaging spectrometers are introduced. The principle of the angular shearing beam-splitter and lateral shearing beam-splitter are provided. And the merits and demerits of them are also introduced. A new lateral shearing beam-splitter is provided and the principle of its structure is elaborated and analyzed, and the results of its application in FTS have been discussed. When the structures of beam-splitters are in the same size, it can generate ten more times of the spacing generated by other beam-splitters.