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Proceedings Paper

Accurate modeling of optical system aberrations applied to the design of a stationary Fourier transform spectroradiometer
Author(s): Hervé Sauer; Yann Ferrec; Catherine Armellin; Jean Taboury; Patricia Cymbalista; Nicolas Guérineau; Marie-Aude Martin; Jérôme Primot
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Paper Abstract

Stationary Fourier transform spectrometry is a well-known concept to build reliable field or embedded spectroradiometers, especially for the mid- and far- infrared. However, the quality of the interference pattern imaged on the focal plane array is crucial to obtain a good spectrum by Fourier transform. We describe here an accurate modeling of the interferometer behavior that takes into account the instrument aberrations and field of view in order to quantitatively predict, at each wavelength and for a spatially extended uniform incoherent source, the real interferogram defects, namely, fringe distortion, fringe blurring and illumination non-uniformity. To investigate these effects, we first derive the properties of the elementary interferograms built by each source point. For this purpose, we use ray-tracing to extract optical path and vignetting information with the help of a commercial optical design software package, and we reconstruct from them the two wavefronts that hit the detector using general numerical methods with the help of standard computing tools. The whole interferogram being formed by the incoherent superposition of all elementary interferograms, we next, compute the relevant quantities by appropriate numerical quadratures. We illustrate this method with two potential layouts of a Fourier transform spectrometer that we are currently designing for accurate radiometric measurements in the 2.9μm-9.6μm range with a spectral resolution better than 8cm-1 on a 4.5°x0.6° field of view.

Paper Details

Date Published: 15 October 2005
PDF: 9 pages
Proc. SPIE 5962, Optical Design and Engineering II, 596212 (15 October 2005); doi: 10.1117/12.624794
Show Author Affiliations
Hervé Sauer, Lab. Charles Fabry de l'Institut d'Optique, CNRS (France)
Yann Ferrec, Lab. Charles Fabry de l'Institut d'Optique, CNRS (France)
Catherine Armellin, Lab. Charles Fabry de l'Institut d'Optique, CNRS (France)
Jean Taboury, Lab. Charles Fabry de l'Institut d'Optique, CNRS (France)
Patricia Cymbalista, Office National d'Étude et de Recherche Aérospatiales (France)
Nicolas Guérineau, Office National d'Étude et de Recherche Aérospatiales (France)
Marie-Aude Martin, Office National d'Étude et de Recherche Aérospatiales (France)
Jérôme Primot, Office National d'Étude et de Recherche Aérospatiales (France)


Published in SPIE Proceedings Vol. 5962:
Optical Design and Engineering II
Laurent Mazuray; Rolf Wartmann, Editor(s)

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