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Applied Optics

Applied Optics


  • Editor: Glenn D. Boreman
  • Vol. 44, Iss. 31 — Nov. 1, 2005
  • pp: 6635–6643

Quantum cascade laser sensor for SO2 and SO3 for application to combustor exhaust streams

Wilson T. Rawlins, Joel M. Hensley, David M. Sonnenfroh, David B. Oakes, and Mark G. Allen  »View Author Affiliations

Applied Optics, Vol. 44, Issue 31, pp. 6635-6643 (2005)

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We have demonstrated a high-sensitivity, room-temperature quantum-cascade (QC) laser sensor for detection of SO2 and SO3 under conditions relevant to aircraft test combustor exhaust. Two QC lasers probe infrared absorption features at 7.50 and 7.16 μm for SO2 and SO3, respectively, with a common dual-beam detection system. We inferred a noise-equivalent absorbance of ~1 × 10−4 Hz−1/2. We have demonstrated detection limits for both SO2 and SO3 of 1–2 ppmv m/Hz1/2 (where ppmv is parts in 106 by volume) for 300 torr, elevated temperature, and path lengths near 1 m. This level of sensitivity permits measurement of <1 ppmv of SO2 and SO3 at these conditions with modest signal averaging.

© 2005 Optical Society of America

OCIS Codes
(010.1120) Atmospheric and oceanic optics : Air pollution monitoring
(120.1740) Instrumentation, measurement, and metrology : Combustion diagnostics
(300.6340) Spectroscopy : Spectroscopy, infrared

Original Manuscript: January 31, 2005
Revised Manuscript: May 24, 2005
Manuscript Accepted: June 10, 2005
Published: November 1, 2005

Wilson T. Rawlins, Joel M. Hensley, David M. Sonnenfroh, David B. Oakes, and Mark G. Allen, "Quantum cascade laser sensor for SO2 and SO3 for application to combustor exhaust streams," Appl. Opt. 44, 6635-6643 (2005)

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