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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 40, Iss. 15 — May. 20, 2001
  • pp: 2571–2578

Effects of adsorption–desorption processes on the response time and accuracy of photoacoustic detection of ammonia

Andreas Schmohl, Andras Miklos, and Peter Hess  »View Author Affiliations


Applied Optics, Vol. 40, Issue 15, pp. 2571-2578 (2001)
http://dx.doi.org/10.1364/AO.40.002571


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Abstract

A distributed-feedback (DFB) diode laser radiating at 1.53 µm was used for photoacoustic detection of ammonia molecules in the gas phase under flow conditions. The influence of the adsorption–desorption processes that occur at the cell and tube walls on the measured gas concentration was studied. Dramatic differences in the adsorption behavior of a metal and a polypropylene cell are demonstrated. Simulations of the gas flow and adsorption–desorption processes yield the conditions that must be fulfilled for accurate concentration measurements in trace-gas analysis of polar molecules.

© 2001 Optical Society of America

OCIS Codes
(300.6260) Spectroscopy : Spectroscopy, diode lasers
(300.6270) Spectroscopy : Spectroscopy, far infrared
(300.6430) Spectroscopy : Spectroscopy, photothermal

History
Original Manuscript: June 21, 2000
Revised Manuscript: January 16, 2001
Published: May 20, 2001

Citation
Andreas Schmohl, Andras Miklos, and Peter Hess, "Effects of adsorption–desorption processes on the response time and accuracy of photoacoustic detection of ammonia," Appl. Opt. 40, 2571-2578 (2001)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-40-15-2571

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