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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 49, Iss. 26 — Sep. 10, 2010
  • pp: 4963–4972

Application of time-division-multiplexed lasers for measurements of gas temperature and CH 4 and H 2 O concentrations at 30 kHz in a high-pressure combustor

Andrew W. Caswell, Thilo Kraetschmer, Keith Rein, Scott T. Sanders, Sukesh Roy, Dale T. Shouse, and James R. Gord  »View Author Affiliations


Applied Optics, Vol. 49, Issue 26, pp. 4963-4972 (2010)
http://dx.doi.org/10.1364/AO.49.004963


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Abstract

Two time-division-multiplexed (TDM) sources based on fiber Bragg gratings were applied to monitor gas temperature, H 2 O mole fraction, and CH 4 mole fraction using line-of-sight absorption spectroscopy in a practical high-pressure gas turbine combustor test article. Collectively, the two sources cycle through 14 wavelengths in the 1329 1667 nm range every 33 μs . Although it is based on absorption spectroscopy, this sensing technology is fundamentally different from typical diode-laser-based absorption sensors and has many advantages. Specifically, the TDM lasers allow efficient, flexible acquisition of discrete- wavelength information over a wide spectral range at very high speeds (typically 30 kHz ) and thereby provide a multiplicity of precise data at high speeds. For the present gas turbine application, the TDM source wavelengths were chosen using simulated temperature-difference spectra. This approach is used to select TDM wavelengths that are near the optimum values for precise temperature and species- concentration measurements. The application of TDM lasers for other measurements in high-pressure, turbulent reacting flows and for two-dimensional tomographic reconstruction of the temperature and species-concentration fields is also forecast.

© 2010 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:
Lasers and Laser Optics

History
Original Manuscript: January 25, 2010
Revised Manuscript: July 19, 2010
Manuscript Accepted: August 12, 2010
Published: September 8, 2010

Citation
Andrew W. Caswell, Thilo Kraetschmer, Keith Rein, Scott T. Sanders, Sukesh Roy, Dale T. Shouse, and James R. Gord, "Application of time-division-multiplexed lasers for measurements of gas temperature and CH4 and H2O concentrations at 30 kHz in a high-pressure combustor," Appl. Opt. 49, 4963-4972 (2010)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-49-26-4963

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