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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 45, Iss. 20 — Jul. 10, 2006
  • pp: 4966–4971

Ammonia detection by using quantum-cascade laser photoacoustic spectroscopy

Milton B. Filho, Marcelo G. da Silva, Marcelo S. Sthel, Delson U. Schramm, Helion Vargas, Andras Miklós, and Peter Hess  »View Author Affiliations


Applied Optics, Vol. 45, Issue 20, pp. 4966-4971 (2006)
http://dx.doi.org/10.1364/AO.45.004966


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Abstract

A pulsed quantum-cascade distributed-feedback laser, temperature tunable from 41 ° C to + 31.6 ° C , and a resonant differential photoacoustic detector are used to measure trace-gas concentrations to as low as 66 parts per 10 9 by volume ( ppbv ) ammonia at a low laser power of 2   mW . Good agreement between the experimental spectrum and the simulated HITRAN spectrum of NH 3 is found in the spectral range between 1046 and 1052   cm 1 . A detection limit of 30   ppbv ammonia at a signal-to-noise ratio of 1 was obtained with the quantum-cascade laser (QCL) photoacoustic (PA) setup. Concentration changes of 50   ppbv were detectable with this compact and versatile QCL-based PA detection system. The performance of the PA detector, characterized by the product of the incident laser power and the minimum detectable absorption coefficient, was 4.7 × 10 9   W   cm 1 .

© 2006 Optical Society of America

OCIS Codes
(140.3490) Lasers and laser optics : Lasers, distributed-feedback
(280.1120) Remote sensing and sensors : Air pollution monitoring
(300.6430) Spectroscopy : Spectroscopy, photothermal

History
Original Manuscript: October 26, 2005
Revised Manuscript: February 6, 2006
Manuscript Accepted: February 7, 2006

Citation
Milton B. Filho, Marcelo G. da Silva, Marcelo S. Sthel, Delson U. Schramm, Helion Vargas, Andras Miklós, and Peter Hess, "Ammonia detection by using quantum-cascade laser photoacoustic spectroscopy," Appl. Opt. 45, 4966-4971 (2006)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-45-20-4966

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