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Proceedings Paper

Trace gas detection using a novel cantilever-based photoacoustic spectrometer with multiplexed optical fiber-coupled diode lasers and fiber-amplification
Author(s): Alistair M. Parkes; Katherine A. Keen; Edward D. McNaghten
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Paper Abstract

This paper describes a cantilever-based photoacoustic spectrometer that is capable of gas detection at ppm levels. The use of optical fiber components enables the first demonstration of modulation frequency divisional multiplexing (MFDM) using tunable diode lasers and the photoacoustic spectrometer. The best-case sensitivity of 3.4 × 10-10 cm-1 W Hz-1/2 (3σ) for measurements using a CO2-containing gas standard are consistent with a previously published value of 1.7 × 10-10 cm-1 W Hz-1/2 (1σ). To the best of our knowledge we have presented the first demonstration of MFDM using a cantilever-based photoacoustic spectrometer. An erbium doped fiber amplifier (EDFA) has been used to amplify simultaneous two distributed feedback tunable diode lasers of closely spaced wavelengths as demonstrated by recording photoacoustic (PA) signals of CO and CO2.

Paper Details

Date Published: 12 October 2007
PDF: 7 pages
Proc. SPIE 6770, Fiber Optic Sensors and Applications V, 67701C (12 October 2007); doi: 10.1117/12.736682
Show Author Affiliations
Alistair M. Parkes, AWE plc (United Kingdom)
Katherine A. Keen, AWE plc (United Kingdom)
Edward D. McNaghten, AWE plc (United Kingdom)

Published in SPIE Proceedings Vol. 6770:
Fiber Optic Sensors and Applications V
Eric Udd, Editor(s)

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