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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 30 — Oct. 20, 1999
  • pp: 6398–6407

Effects of a nonlinear response of the Fourier-transform infrared open-path instrument on the measurements of some atmospheric gases

George M. Russwurm and Bill Phillips  »View Author Affiliations


Applied Optics, Vol. 38, Issue 30, pp. 6398-6407 (1999)
http://dx.doi.org/10.1364/AO.38.006398


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Abstract

The response of a Fourier-transform infrared (FTIR) instrument to changes in absorbance is inherently nonlinear for a number of reasons. One is that the interferogram acquired by the FTIR is truncated and then apodized before further processing of the data is accomplished. A commonly used apodization function in open-path FTIR research is triangular apodization, and all the research presented here has been done with that function. We calculated a set of absorption spectra by using the HITRAN database, covering ranges in both concentration and temperature for water, ammonia, and methane. Plots of these data reveal nonlinear results. The commonly used analysis technique, classical least squares, assumes that the response is linear. We describe some of the effects of this nonlinearity and present ways to address these effects.

© 1999 Optical Society of America

OCIS Codes
(280.1120) Remote sensing and sensors : Air pollution monitoring
(300.6300) Spectroscopy : Spectroscopy, Fourier transforms

History
Original Manuscript: February 1, 1999
Revised Manuscript: June 25, 1999
Published: October 20, 1999

Citation
George M. Russwurm and Bill Phillips, "Effects of a nonlinear response of the Fourier-transform infrared open-path instrument on the measurements of some atmospheric gases," Appl. Opt. 38, 6398-6407 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-30-6398

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