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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 9 — Mar. 20, 1999
  • pp: 1467–1475

Spontaneous anti-Stokes Raman probe for gas temperature measurements in industrial furnaces

George Zikratov, Fang-Yu Yueh, Jagdish P. Singh, O. Perry Norton, R. Arun Kumar, and Robert L. Cook  »View Author Affiliations


Applied Optics, Vol. 38, Issue 9, pp. 1467-1475 (1999)
http://dx.doi.org/10.1364/AO.38.001467


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Abstract

A compact, pulsed Nd:YAG laser-based instrument has been built to measure in situ absolute gas temperatures in large industrial furnaces by use of spontaneous anti-Stokes Raman scattering. The backscattering configuration was used to simplify the optics alignment and increase signal-to-noise ratios. Gated signal detection significantly reduced the background emission that is found in combustion environments. The anti-Stokes instead of the Stokes component was used to eliminate contributions to spectra from cold atmospheric nitrogen. The system was evaluated in a methane/air flame and in a bench-top oven, and the technique was found to be a reliable tool for nonintrusive absolute temperature measurements with relatively clean gas streams. A water-cooled insertion probe was integrated with the Raman system for measurement of the temperature profiles inside an industrial furnace. Gas temperatures near 1500–1800 K at atmospheric pressure in an industrial furnace were inferred by fitting calculated profiles to experimental spectra with a standard deviation of less than 1% for averaging times of ∼200 s. The temperatures inferred from Raman spectra are in good agreement with data recorded with a thermocouple probe.

© 1999 Optical Society of America

OCIS Codes
(120.1740) Instrumentation, measurement, and metrology : Combustion diagnostics
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(120.6780) Instrumentation, measurement, and metrology : Temperature
(140.3440) Lasers and laser optics : Laser-induced breakdown
(300.6330) Spectroscopy : Spectroscopy, inelastic scattering including Raman
(300.6450) Spectroscopy : Spectroscopy, Raman

History
Original Manuscript: June 12, 1998
Revised Manuscript: December 21, 1998
Published: March 20, 1999

Citation
George Zikratov, Fang-Yu Yueh, Jagdish P. Singh, O. Perry Norton, R. Arun Kumar, and Robert L. Cook, "Spontaneous anti-Stokes Raman probe for gas temperature measurements in industrial furnaces," Appl. Opt. 38, 1467-1475 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-9-1467


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