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Proceedings Paper

Characterization of the ACE-FTS instrument line shape
Author(s): Robert Poulin; Yvan Dutil; Stephane Lantagne; Francois Chateauneuf
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Paper Abstract

The Atmospheric Chemistry Experiment (ACE) is the mission selected by the Canadian Space Agency for its new science satellite, SCISAT-1. Dr. Peter Bernath of the University of Waterloo is the ACE Mission Scientist, and ABB is the industrial contractor for the development of the ACE primary instrument. The ACE primary instrument is an infrared Fourier Transform Spectrometer (FTS) coupled with an auxiliary 2-channel visible and near infrared imager. The FTS, operating from 2.4 to 13.3 microns, will measure at an unapodised resolution of 0.02 cm-1 the infrared absorption signals that contain information on different atmospheric layers to provide vertical profiles of atmospheric constituents. Its highly folded design results in a very high performance instrument with a compact size. The imager will monitor aerosols based on the extinction of solar radiation using two filtered detectors at 1.02 and 0.525 microns. The instrument also includes a suntracker, which provides the sun radiance to both the FTS and the imager during solar occultation of the earth’s atmosphere. In order to meet all science objectives, the instrument line width of the ACE-FTS has to be smaller than 0.028 cm-1. There are however different instrument function contributors affecting the width and the symmetry of spectral lines. These contributors are related to effects inherent to the instrument. This paper will describe these different effects and their impacts on the instrument line shape (ILS). Results obtained during the ILS characterisation of the flight model will be presented. A short description of a correction algorithm is also discussed.

Paper Details

Date Published: 10 November 2003
PDF: 7 pages
Proc. SPIE 5151, Earth Observing Systems VIII, (10 November 2003); doi: 10.1117/12.505982
Show Author Affiliations
Robert Poulin, ABB (Canada)
Yvan Dutil, ABB (Canada)
Stephane Lantagne, ABB (Canada)
Francois Chateauneuf, ABB (Canada)

Published in SPIE Proceedings Vol. 5151:
Earth Observing Systems VIII
William L. Barnes, Editor(s)

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