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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 33 — Nov. 20, 2013
  • pp: 7950–7962

Two-color absorption spectroscopy strategy for measuring the column density and path average temperature of the absorbing species in nonuniform gases

Christopher S. Goldenstein, Ian A. Schultz, Jay B. Jeffries, and Ronald K. Hanson  »View Author Affiliations


Applied Optics, Vol. 52, Issue 33, pp. 7950-7962 (2013)
http://dx.doi.org/10.1364/AO.52.007950


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Abstract

A two-color absorption spectroscopy strategy has been developed for measuring the column density and density-weighted path-average temperature of the absorbing species in nonuniform gases. This strategy uses two transitions with strengths that scale nearly linearly with temperature. In addition, measured lineshapes are used to accurately model absorbance spectra. As a result, the column density and density-weighted path-average temperature of the absorbing species can be inferred from a comparison of signals measured across a nonuniform line of sight (LOS) with simulated signals calculated using a uniform LOS. This strategy is demonstrated with simulations of water-vapor absorption across a nonuniform LOS with temperature and composition gradients comparable to those in hydrogen–air diffusion flames. In this demonstration, both the column density and density-weighted path-average temperature of water vapor are recovered to within 0.5%.

© 2013 Optical Society of America

OCIS Codes
(120.1740) Instrumentation, measurement, and metrology : Combustion diagnostics
(120.6780) Instrumentation, measurement, and metrology : Temperature
(280.2470) Remote sensing and sensors : Flames
(280.2490) Remote sensing and sensors : Flow diagnostics
(300.1030) Spectroscopy : Absorption
(300.6380) Spectroscopy : Spectroscopy, modulation

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: May 28, 2013
Revised Manuscript: September 24, 2013
Manuscript Accepted: September 27, 2013
Published: November 13, 2013

Citation
Christopher S. Goldenstein, Ian A. Schultz, Jay B. Jeffries, and Ronald K. Hanson, "Two-color absorption spectroscopy strategy for measuring the column density and path average temperature of the absorbing species in nonuniform gases," Appl. Opt. 52, 7950-7962 (2013)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-52-33-7950


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