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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 42, Iss. 3 — Jan. 20, 2003
  • pp: 566–578

Analysis of transient-grating signals for reacting-flow applications

Michael S. Brown, Yuanyuan Li, William L. Roberts, and James R. Gord  »View Author Affiliations


Applied Optics, Vol. 42, Issue 3, pp. 566-578 (2003)
http://dx.doi.org/10.1364/AO.42.000566


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Abstract

Single-shot transient-grating measurements for thermometry in pressurized reacting flows are examined in the context of rapid digital signal processing. Simple approaches are discussed for temperature determination and rejection of unwanted signals in real-time measurement applications. Examples of temperature data in pressurized postflame gases are presented in the form of probability-density functions (PDFs). Three contributions to the PDF half-widths are discussed. Analysis of phase-matching requirements indicates that beam steering as a result of density fluctuations affects the signal amplitude but not the grating period. Therefore, such stochastic beam deviations have little effect on the derived temperatures. Mode noise on the cw probe beam as well as linear light scattering are found to be insignificant in the frequency range of the observed transient-grating acoustic signature. Use of a single-mode laser for the pump beams is shown to enhance the signal intensity.

© 2003 Optical Society of America

OCIS Codes
(050.7330) Diffraction and gratings : Volume gratings
(120.1740) Instrumentation, measurement, and metrology : Combustion diagnostics
(290.5890) Scattering : Scattering, stimulated
(300.6430) Spectroscopy : Spectroscopy, photothermal

History
Original Manuscript: March 13, 2002
Revised Manuscript: September 17, 2002
Published: January 20, 2003

Citation
Michael S. Brown, Yuanyuan Li, William L. Roberts, and James R. Gord, "Analysis of transient-grating signals for reacting-flow applications," Appl. Opt. 42, 566-578 (2003)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-42-3-566

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