Resonant photoacoustic simultaneous detection of methane and ethylene by means of a 1.63-μm diode laser.
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| Title: | Resonant photoacoustic simultaneous detection of methane and ethylene by means of a 1.63-μm diode laser. |
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| Authors: | Boschetti, A., Bassi, D., Jacob, E., Iannotta, S., Ricci, L., Scotoni, M. |
| Source: | Applied Physics B: Lasers & Optics. 2002, Vol. 74 Issue 3, p273. 6p. |
| Subjects: | Photoacoustic spectroscopy, Methane, Ethylene, Lasers |
| 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&sup-1;, obtained with an IR pulsed laser photoacoustic spectrometer, allowed us to find a wavelength region where the 2v[sub3] overtone of CH[sub4] and the v[sub5] + v[sub9] combination band of C[sub2]H[sub4] show uncongested rotational lines. Using a single-mode scan of the diode laser in this region, around 6150 cm&sup-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. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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