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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 40, Iss. 24 — Aug. 20, 2001
  • pp: 4387–4394

Ammonia detection by use of near-infrared diode-laser-based overtone spectroscopy

Ricardo Claps, Florian V. Englich, Darrin P. Leleux, Dirk Richter, Frank K. Tittel, and Robert F. Curl  »View Author Affiliations


Applied Optics, Vol. 40, Issue 24, pp. 4387-4394 (2001)
http://dx.doi.org/10.1364/AO.40.004387


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Abstract

We describe a portable diode-laser-based sensor for NH3 detection using vibrational overtone absorption spectroscopy at 1.53 µm. Use of fiber-coupled optical elements makes such a trace gas sensor rugged and easy to align. On-line data acquisition and processing requiring <30 s can be performed with a laptop PC running LabVIEW software. The gas sensor was used primarily for NH3 concentration measurements with a sensitivity of 0.7 parts per million (signal-to-noise ratio of 3) over a two-week period in a bioreactor being developed at the NASA Johnson Space Center for water treatment technologies to support long-duration space missions. The feasibility of simultaneous, real-time measurements of NH3 and CO2 concentrations is also reported.

© 2001 Optical Society of America

OCIS Codes
(140.3490) Lasers and laser optics : Lasers, distributed-feedback
(280.3420) Remote sensing and sensors : Laser sensors
(300.6360) Spectroscopy : Spectroscopy, laser

History
Original Manuscript: December 4, 2000
Revised Manuscript: April 17, 2001
Published: August 20, 2001

Citation
Ricardo Claps, Florian V. Englich, Darrin P. Leleux, Dirk Richter, Frank K. Tittel, and Robert F. Curl, "Ammonia detection by use of near-infrared diode-laser-based overtone spectroscopy," Appl. Opt. 40, 4387-4394 (2001)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-40-24-4387

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