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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.
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]
Copyright of Applied Physics B: Lasers & Optics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: <searchLink fieldCode="DE" term="%22Photoacoustic+spectroscopy%22">Photoacoustic spectroscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Methane%22">Methane</searchLink><br /><searchLink fieldCode="DE" term="%22Ethylene%22">Ethylene</searchLink><br /><searchLink fieldCode="DE" term="%22Lasers%22">Lasers</searchLink>
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  Data: 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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  Data: <i>Copyright of Applied Physics B: Lasers & Optics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Type: general
      – SubjectFull: Methane
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      – SubjectFull: Ethylene
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