Simultaneous detection of ammonia, methane and ethylene at 1.63 μm with diode laser photoacoustic spectroscopy |
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Authors: | M Scotoni A Rossi D Bassi R Buffa S Iannotta A Boschetti |
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Institution: | (1) Dipartimento di Fisica, Università di Trento, 38050 Povo-Trento, Italy;(2) Dipartimento di Fisica, Università di Siena, 53100 Siena, Italy;(3) CNR-ITC Sezione di Trento, Istituto di Fotonica e Nanotecnologie, 38050 Povo-Trento, Italy |
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Abstract: | Spectral investigation around 6115 cm-1 for simultaneous detection of ammonia, methane and ethylene in gas samples is presented. Experimental data on the ν2+ν3+ν4 combination band of ammonia are reported with a resolution of 1.5 GHz. A trace gas analyzer based on a resonant photoacoustic
cell and an external cavity diode laser has been used for detection. A data fitting procedure has been developed in order
to improve the system sensitivity and to limit the need of a reference cell. The selected spectral region allows a sensitivity
of about 60 ppm for ammonia, 6 ppm for methane and 30 ppm for ethylene with 0.3 mW laser power. An application of simultaneous
detection of such molecules in a mixture reproducing their typical abundances in real gas samples from biomass gasification
is discussed.
PACS 42.62.Fi; 42.55.Px; 82.80.Ch |
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Keywords: | |
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