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Proceedings Paper

Spaceborne infrared interferometer of the IASI instrument
Author(s): Francois Henault; Christian Buil; Benoit Chidaine; Denis Scheidel
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Paper Abstract

Within the IASI (Infrared Atmospheric Sounding Interferometer) instrument, the principal function of the Interferometer and Hot Optics Subassembly (IHOS) is to create modulated interferograms which will be recorded by the Cold Box Subsystem. The IHOS is a spaceborne Fourier Transform Spectrometer (FTS) working in the 3.6 - 15.5 micrometer wavelength range. It is basically a Michelson interferometer where the flat mirrors are replaced with hollow corner-cubes retro-reflectors, one of which is moving along the optical axis in order to create a variable Optical Path Difference (OPD). The IHOS is mainly composed of the following components mounted on the same optical bench: (1) The Michelson interferometer, including the beamsplitter and the fixed and moving hollow cube-corners. (2) The cube-corner driving mechanism. (3) The entrance and exit optics. In addition, a reference interferogram is created by means of a reference laser source in order to generate a pulsed electrical signal defining the interferogram sampling times. The laser module consists in a highly stable laser source (10-7) and its control loop electronics, and is deported from the optical bench by means of an optical fiber. The most critical requirements of the IASI interferometer are the lateral shifts of the moving cube-corner (seen through the beamsplitter), the misalignment of its scanning axis, and the reference laser alignment error. These contributions must not exceed 15 micrometer, 200 (mu) rad and 300 (mu) rad respectively during the five years mission in orbit.

Paper Details

Date Published: 18 November 1998
PDF: 11 pages
Proc. SPIE 3437, Infrared Spaceborne Remote Sensing VI, (18 November 1998); doi: 10.1117/12.331302
Show Author Affiliations
Francois Henault, Aerospatiale (France)
Christian Buil, CNES (France)
Benoit Chidaine, Aerospatiale (France)
Denis Scheidel, Aerospatiale (France)

Published in SPIE Proceedings Vol. 3437:
Infrared Spaceborne Remote Sensing VI
Marija Strojnik; Bjorn F. Andresen, Editor(s)

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