CaltechAUTHORS
  A Caltech Library Service

Reducing the impact of source brightness fluctuations on spectra obtained by Fourier-transform spectrometry

Keppel-Aleka, Gretchen and Toon, Geoffrey C. and Wennberg, Paul O. and Deutscher, Nicholas M. (2007) Reducing the impact of source brightness fluctuations on spectra obtained by Fourier-transform spectrometry. Applied Optics, 46 (21). pp. 4774-4779. ISSN 0003-6935. https://resolver.caltech.edu/CaltechAUTHORS:KEPao07

[img]
Preview
PDF - Published Version
See Usage Policy.

1419Kb

Use this Persistent URL to link to this item: https://resolver.caltech.edu/CaltechAUTHORS:KEPao07

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.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1364/AO.46.004774DOIArticle
http://www.opticsinfobase.org/abstract.cfm?URI=ao-46-21-4774OtherUNSPECIFIED
http://www.opticsinfobase.org/abstract.cfm?URI=ao-46-21-4774OtherUNSPECIFIED
ORCID:
AuthorORCID
Toon, Geoffrey C.0000-0003-4174-7541
Wennberg, Paul O.0000-0002-6126-3854
Deutscher, Nicholas M.0000-0002-2906-2577
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.
Subject Keywords:Atmospheric composition, Continuous optical signal processing
Issue or Number:21
Record Number:CaltechAUTHORS:KEPao07
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:KEPao07
Official Citation:G. Keppel-Aleks, G. C. Toon, P. O. Wennberg, and N. M. Deutscher, "Reducing the impact of source brightness fluctuations on spectra obtained by Fourier-transform spectrometry," Appl. Opt. 46, 4774-4779 (2007) http://www.opticsinfobase.org/abstract.cfm?URI=ao-46-21-4774
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:8651
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:02 Sep 2007
Last Modified:09 Mar 2020 13:19

Repository Staff Only: item control page