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Proceedings Paper

Modulation cancellation method (MOCAM) in modulation spectroscopy
Author(s): V. Spagnolo; L. Dong; A. A. Kosterev; D. Thomazy; J. H. Doty; F. K. Tittel
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Paper Abstract

An innovative spectroscopic technique based on balancing and cancellation of modulated signals induced by two excitation sources. We used quartz enhanced photoacoustic spectroscopy (QEPAS) in a 2f wavelength modulation mode as an absorption sensing technique and employed a modulation cancelation approach for spectroscopic measurements of small temperature differences in a gas mixture and detection of broadband absorbers. We demonstrated measurement of small temperature differences in a C2H2/N2gas mixture with a sensitivity of 30 mK in 17 sec and detection of hydrazine, a broadband absorbing chemical species, down to concentration of 1 part per million in volume in 1 sec. In both cases we used near-infrared laser diodes and selected overtone transitions.nuscrip

Paper Details

Date Published: 6 May 2011
PDF: 6 pages
Proc. SPIE 8073, Optical Sensors 2011; and Photonic Crystal Fibers V, 807313 (6 May 2011); doi: 10.1117/12.886272
Show Author Affiliations
V. Spagnolo, Rice Univ. (United States)
Politecnico di Bari (Italy)
IFN, CNR (Italy)
L. Dong, Rice Univ. (United States)
A. A. Kosterev, Rice Univ. (United States)
D. Thomazy, Rice Univ. (United States)
J. H. Doty, Rice Univ. (United States)
F. K. Tittel, Rice Univ. (United States)

Published in SPIE Proceedings Vol. 8073:
Optical Sensors 2011; and Photonic Crystal Fibers V
Kyriacos Kalli; Francesco Baldini; Jiri Homola; Robert A. Lieberman, Editor(s)

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