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Applied Optics

Applied Optics


  • Editor: Glenn D. Boreman
  • Vol. 44, Iss. 31 — Nov. 1, 2005
  • pp: 6653–6659

Diode laser absorption spectroscopy of water vapor in a scramjet combustor

Alan D. Griffiths and A. Frank P. Houwing  »View Author Affiliations

Applied Optics, Vol. 44, Issue 31, pp. 6653-6659 (2005)

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A sensor based on tunable diode laser absorption spectroscopy was constructed for time-resolved temperature and water vapor concentration measurements in a scramjet combustor. The sensor probed two absorption lines near 1390 nm with two time-multiplexed lasers used to measure temperature and water vapor concentration at up to 20 kHz. A demonstration experiment was performed in the supersonic, expanding exhaust region of the combustor, showing the measurement to be repeatable, able to resolve temporal trends during tunnel operation, and sensitive to changes in combustor operating conditions.

© 2005 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
(300.6260) Spectroscopy : Spectroscopy, diode lasers
(300.6340) Spectroscopy : Spectroscopy, infrared

Original Manuscript: February 1, 2005
Revised Manuscript: May 9, 2005
Manuscript Accepted: May 13, 2005
Published: November 1, 2005

Alan D. Griffiths and A. Frank P. Houwing, "Diode laser absorption spectroscopy of water vapor in a scramjet combustor," Appl. Opt. 44, 6653-6659 (2005)

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