Physics – Optics
Scientific paper
Sep 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994spie.2210..652l&link_type=abstract
Proc. SPIE Vol. 2210, p. 652-663, Space Optics 1994: Space Instrumentation and Spacecraft Optics, Thierry M. Dewandre; Joachim J
Physics
Optics
Scientific paper
The Interferometric Analysis Computer Code is a program developed to evaluate the performances of Fourier Transform Spectrometers. It has been carried out in the frame of the IASI program. It is a stand-alone code which can use as input the optical system data set up by an optical design software. The interference phenomenon is evaluated using the optical data of both interferometer arms by means of real ray-tracing. The mathematical model used to obtain the output signal is based on the concept that, for a monochromatic source, this signal is quite similar to an ideal sine. This allows to calculate three functions describing the difference between the ideal interferogram and the simulated one. These represent the average level of the output irradiance, the modulation and the phase of the oscillating terms as a function of the Optical Path Difference. These functions are quite smooth and then easily representable by fitting. Therefore in order to have a good representation of them it is sufficient a number of points much smaller than those necessary to represent correctly an interferogram. Then a great advantage in terms of computation time is obtained, especially when many signals have to be added to simulate the effect of a detector covering a quite large field of view. Furthermore, the possibility to input in the optical data files different kinds of manufacturing or assembly errors allows to estimate the sensitivity of the optical components respect to these aspects. This makes possible the calculation of an exhaustive tolerance budget.
Labate Demetrio
Pieri Silvano
Pili Paolo
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