Reducing the impact of source brightness fluctuations on spectra obtained by Fourier-transform spectrometry
Abstract
We present a method to reduce the impact of source brightness fluctuations (SBFs) on spectra recorded by Fourier-transform spectrometry (FTS). Interferograms are recorded without AC coupling of the detector signal (DC mode). The SBF are determined by low-pass filtering of the DC interferograms, which are then reweighted by the low-pass, smoothed signal. Atmospheric solar absorption interferograms recorded in DC mode have been processed with and without this technique, and we demonstrate its efficacy in producing more consistent retrievals of atmospheric composition. We show that the reweighting algorithm improves retrievals from interferograms subject to both gray and nongray intensity fluctuations, making the algorithm applicable to atmospheric data contaminated by significant amounts of aerosol or cloud cover.
Additional Information
© 2007 Optical Society of America Received 29 January 2007; revised 19 March 2007; accepted 22 March 2007; posted 23 March 2007 (Doc. ID 79475); published 6 July 2007 The authors thank D. Griffith and G. Bryant for their role in data acquisition at the Darwin FTS site. J.-F. Blavier is gratefully acknowledged for helpful discussions. This analysis was supported by a grant from NASA (NNGO5-GD07G). The Darwin FTS was developed for the OCO project at NASA JPL; G. Keppel-Aleks acknowledges support from the NSF Graduate Fellowship Program.Attached Files
Published - KEPao07.pdf
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Additional details
- Eprint ID
- 8651
- Resolver ID
- CaltechAUTHORS:KEPao07
- Created
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2007-09-02Created from EPrint's datestamp field
- Updated
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2021-11-08Created from EPrint's last_modified field
- Caltech groups
- Division of Geological and Planetary Sciences