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Berlin 2001 – scientific programme

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MO: Molekülphysik

MO 14: Spektroscopy II

MO 14.6: Talk

Friday, April 6, 2001, 17:00–17:15, H1058

Ammonia detection using near infrared diode laser based overtone spectroscopy at 1.53 microns — •Florian V. Englich1,2, Ricardo Claps1, Dirk Richter1, John C. Graf3, Walter Neu2, Robert F. Curl1, and Frank K. Tittel11Rice Quantum Institute, Rice University, PO Box 1892, Houston, TX 77251-1892, USA — 2Fachhochschule Oldenburg/Ostfriesland/Wilhelmshaven, Naturwissenschaftliche Technik, Constantiaplatz 4, 26723 Emden, Germany — 3Lyndon B. Johnson Space Center, NASA Code EC3, 2101 Nasa Road 1, Houston, TX 77058, USA

A portable diode laser based sensor for NH3 detection using vibrational overtone absorption spectroscopy at 1.53 microns will be reported. The use of fiber-coupled optical elements makes such a trace gas sensor rugged. On-line data acquisition and processing can be performed with a laptop PC running Labview software. The gas sensor was used for NH3 concentration measurements with a sensitivity of 0.7 ppm (SNR=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 will be described.

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