Abstract
A compact multi-component trace-gas detector based on the resonant photoacoustic technique and a NIR external cavity diode laser has been developed. It has been characterized using a mixture of ethylene and methane diluted in ambient air. A spectroscopic investigation of combination bands and overtones between 5900 and 6250 cm-1, obtained with an IR pulsed laser photoacoustic spectrometer, allowed us to find a wavelength region where the 2ν3 overtone of CH4 and the ν5+ν9 combination band of C2H4 show uncongested rotational lines. Using a single-mode scan of the diode laser in this region, around 6150 cm-1, the sensitivity for the simultaneous detection of ethylene and methane is 8 ppm/mW and 40 ppm/mW respectively. Factors affecting the sensitivity and selectivity of the detection system and possible improvements suitable to reach the sub-ppm detection limit are discussed.
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Received: 1 August 2001 / Revised version: 28 November 2001 / Published online: 7 February 2002
An erratum to this article is available at http://dx.doi.org/10.1007/s00340-005-1924-0.
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Boschetti, A., Bassi, D., Iacob, E. et al. Resonant photoacoustic simultaneous detection of methane and ethylene by means. of a 1.63-μm diode laser. Appl Phys B 74, 273–278 (2002). https://doi.org/10.1007/s003400200790
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DOI: https://doi.org/10.1007/s003400200790