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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 41, Iss. 9 — Mar. 20, 2002
  • pp: 1815–1823

Detection of Ammonia by Photoacoustic Spectroscopy with Semiconductor Lasers

Andreas Schmohl, András Miklós, and Peter Hess  »View Author Affiliations


Applied Optics, Vol. 41, Issue 9, pp. 1815-1823 (2002)
http://dx.doi.org/10.1364/AO.41.001815


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Abstract

Sensitive photoacoustic detection of ammonia with near-infrared diode lasers (1.53 μm) and a novel differential acoustic resonator is described; a sensitivity of 0.2 parts per million volume (signal-to-noise ratio = 1) is attained. To eliminate adsorption-desorption processes of the polar NH3 molecules, a relatively high gas flow of 300 SCCM was used for the ammonia-nitrogen mixture. The results are compared with recent ammonia measurements with a NIR diode and absorption spectroscopy used for detection and photoacoustic experiments performed with an infrared quantum-cascade laser. The performance of the much simpler and more compact setup introduced here was comparable with these previous state-of-the-art measurements.

© 2002 Optical Society of America

OCIS Codes
(140.2020) Lasers and laser optics : Diode lasers
(300.1030) Spectroscopy : Absorption
(300.6260) Spectroscopy : Spectroscopy, diode lasers
(300.6340) Spectroscopy : Spectroscopy, infrared

Citation
Andreas Schmohl, András Miklós, and Peter Hess, "Detection of Ammonia by Photoacoustic Spectroscopy with Semiconductor Lasers," Appl. Opt. 41, 1815-1823 (2002)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-41-9-1815

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