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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 12 — Apr. 20, 2013
  • pp: 2893–2904

Measurements of multiple gas parameters in a pulsed-detonation combustor using time-division-multiplexed Fourier-domain mode-locked lasers

Andrew W. Caswell, Sukesh Roy, Xinliang An, Scott T. Sanders, Frederick R. Schauer, and James R. Gord  »View Author Affiliations

Applied Optics, Vol. 52, Issue 12, pp. 2893-2904 (2013)

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Hyperspectral absorption spectroscopy is being used to monitor gas temperature, velocity, pressure, and H2O mole fraction in a research-grade pulsed-detonation combustor (PDC) at the Air Force Research Laboratory. The hyperspectral source employed is termed the TDM 3-FDML because it consists of three time-division-multiplexed (TDM) Fourier-domain mode-locked (FDML) lasers. This optical-fiber-based source monitors sufficient spectral information in the H2O absorption spectrum near 1350 nm to permit measurements over the wide range of conditions encountered throughout the PDC cycle. Doppler velocimetry based on absorption features is accomplished using a counterpropagating beam approach that is designed to minimize common-mode flow noise. The PDC in this study is operated in two configurations: one in which the combustion tube exhausts directly to the ambient environment and another in which it feeds an automotive-style turbocharger to assess the performance of a detonation-driven turbine. Because the enthalpy flow [kilojoule/second] is important in assessing the performance of the PDC in various configurations, it is calculated from the measured gas properties.

© 2013 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:

Original Manuscript: February 14, 2013
Manuscript Accepted: March 18, 2013
Published: April 19, 2013

Andrew W. Caswell, Sukesh Roy, Xinliang An, Scott T. Sanders, Frederick R. Schauer, and James R. Gord, "Measurements of multiple gas parameters in a pulsed-detonation combustor using time-division-multiplexed Fourier-domain mode-locked lasers," Appl. Opt. 52, 2893-2904 (2013)

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