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Proceedings Paper • Open Access

Instrumental concept and preliminary performances of SIFTI: static infrared fourier transform interferometer
Author(s): Philippe-Jean Hébert; E. Cansot; C. Pierangelo; C. Buil; F. Bernard; J. Loesel; T. Trémas; L. Perrin; E. Courau; C. Casteras; I. Maussang; D. Simeoni

Paper Abstract

The SIFTI (Static Infrared Fourier Transform Interferometer) instrument aims at supporting an important part in a mission for atmospheric pollution sounding from space, by providing high spectral resolution and high Signal to Noise Ratio spectra of the atmosphere. They will allow to resolve tropospheric profiles of ozone (03) and carbon monoxide (C0), especially down to the planetary boundary layer (PBL), an altitude region of very high interest, though poorly monitored to date, for air quality and pollution monitoring. The retrieved profile of ozone, resp. C0, will contain 5 to 7, resp. 2.5 to 4, independent pieces of information.

The French space agency CNES (Centre National d'Etudes Spatiales) has proposed and is studying an instrument concept for SIFTI based on a static interferometer, where the needed optical path are generated by a pair of crossed staircase fixed mirrors (replacing the moving reflector of dynamic Fourier transform interferometers like IASI or MIPAS). With the SIFTI design, a very high spectral resolution (~0.1 cm-1 apodised) is achieved in a very compact optical setup, allowing a large throughput, hence a high SNR. The measurements are performed in the 9.5 μm band for 03 and in the 4.6 μm band for C0.

The science return of the sounder can be further increased if an "intelligent pointing" process is implemented. This consists in combining the TIR sounder with a companion TIR imager, providing information on the cloud coverage in the next observed scene. 0nboard, real-time analysis of the IR image is used to command the sounder staring mirror to cloud free areas, which will maximize the probability for probing down to the surface. After the first part of the phase A, the architecture of SIFTI was studied as a trade-off between performance and resource budget. We review the main architecture and functional choices, and their advantages. The preliminary instrument concept is then presented in its main aspects and in terms of main subsystem functions.

The preliminary budgets of mass, volume, size and power are also evaluated. Eventually the science performances are estimated, at instrument level and at mission level, and are compared to the specifications. To finish, the ways forward are discussed.

Paper Details

Date Published: 21 November 2017
PDF: 8 pages
Proc. SPIE 10566, International Conference on Space Optics — ICSO 2008, 1056623 (21 November 2017); doi: 10.1117/12.2308253
Show Author Affiliations
Philippe-Jean Hébert, Ctr. National d'Études Spatiales (France)
E. Cansot, Ctr. National d'Études Spatiales (France)
C. Pierangelo, Ctr. National d'Études Spatiales (France)
C. Buil, Ctr. National d'Études Spatiales (France)
F. Bernard, Ctr. National d'Études Spatiales (France)
J. Loesel, Ctr. National d'Études Spatiales (France)
T. Trémas, Ctr. National d'Études Spatiales (France)
L. Perrin, Ctr. National d'Études Spatiales (France)
E. Courau, Ctr. National d'Études Spatiales (France)
C. Casteras, Ctr. National d'Études Spatiales (France)
I. Maussang, Ctr. National d'Études Spatiales (France)
D. Simeoni, Thales Alenia Space (France)

Published in SPIE Proceedings Vol. 10566:
International Conference on Space Optics — ICSO 2008
Josiane Costeraste; Errico Armandillo; Nikos Karafolas, Editor(s)

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