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Etude en laboratoire des propriétés d’un spectromètre de Fourier hétérodyne imageur pour applications spatiales

Abstract : The concept of the heterodyne Fourier transform imaging spectrometer (SFHI, according to the French accronym) has great potential for high resolution planetary spectral imaging. It is an instrument capable of achieving a high spectral resolution, with no moving parts and for smaller telescop diameter, compared to grating spectrometers. In planetary orbit, it should be well fitted for image acquisition in pushbroom mode. It can have a neat advantage over other techniques, requiring high resolution and large throughput in a very small package. This thesis offers an experimental validation of this concept. First it presents a theoretical framework to describe the performances of the instrument, and allows the caracterisation of the components according to the expected specifications. The tolerances of the settings and the efficency of the instrument depending of the paramters is established. Then it presents the design of an optical breadboard that allowed the validation of the theoretical predictions. This breadboard has shown that using on-the-shelf compenents it is possible to obtain good performances in terms of spectral resolution (R=42 000) and imaging. A series of various tests has assessed the agreement between the instrument and the theoretical behavior, to the level of accuracy of the mechanical components. Faithful spectral images have been obtained in the height of the slit. Finally, this work will be the groundbase of a possible future proposition for space research, answering the need for a high performance instrument in the field of high spectral resolution planetary spectro-imaging.
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Submitted on : Tuesday, December 18, 2018 - 10:11:53 AM
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Cilia Damiani. Etude en laboratoire des propriétés d’un spectromètre de Fourier hétérodyne imageur pour applications spatiales. Instrumentation et méthodes pour l'astrophysique [astro-ph.IM]. Observatoire de Paris, 2009. Français. ⟨tel-01958551⟩



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