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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 46, Iss. 19 — Jul. 1, 2007
  • pp: 4117–4124

Robust method for calculating temperature, pressure, and absorber mole fraction from broadband spectra

Laura A. Kranendonk, Andrew W. Caswell, and Scott T. Sanders  »View Author Affiliations


Applied Optics, Vol. 46, Issue 19, pp. 4117-4124 (2007)
http://dx.doi.org/10.1364/AO.46.004117


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Abstract

A robust method is described for calculating temperature, mole fraction, and pressure from measured absorption spectra (absorption coefficients versus optical frequency). The key components to the method are smoothing, differentiation, spectral axis warping, and linear least-squares fitting. The method works best when spectra span a full rotational branch of the target molecule, but in principle it works for any spectral span. The examples presented assume a measured spectrum over the 7246.4 – 7518.8   cm − 1 range, which encompasses the R branch of the v 1 + v 3 band of H 2 O ; however, the techniques should work for most measured spectra.

© 2007 Optical Society of America

OCIS Codes
(120.1740) Instrumentation, measurement, and metrology : Combustion diagnostics
(120.6780) Instrumentation, measurement, and metrology : Temperature
(300.1030) Spectroscopy : Absorption

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: September 27, 2006
Revised Manuscript: December 29, 2006
Manuscript Accepted: March 1, 2007
Published: June 12, 2007

Citation
Laura A. Kranendonk, Andrew W. Caswell, and Scott T. Sanders, "Robust method for calculating temperature, pressure, and absorber mole fraction from broadband spectra," Appl. Opt. 46, 4117-4124 (2007)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-46-19-4117

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