CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Monitoring Hydrogen Sulfide Using a Quantum Cascade Laser Based Trace Gas Sensing System |
WANG Ling-Fang1,2**, SHARPLES Thomas-Roben2
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1Microsystem Research Center, Chongqing University, Chongqing 400030
2Department of Chemistry, University of Oxford, Oxford, England, UK
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Cite this article: |
WANG Ling-Fang, SHARPLES Thomas-Roben 2011 Chin. Phys. Lett. 28 067805 |
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Abstract We present the detection of hydrogen sulfide (H2S) in a quantum cascade laser (QCL) based gas sensing system employing direct laser absorption spectroscopy. The sensitivity is obtained to be 3.61×10−6 cm−1Hz−1/2 and the H2S broadening coefficient in N2 is analyzed by fitting to the plot of the Lorentzian half width at the half maximum as a function of N2 pressure is 0.1124 ±0.0031 cm−1⋅atm−1. A simulation based on data from the HITRAN database shows broad agreement with the experimentally obtained spectrum.
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Keywords:
78.20.Ci
82.80.Dx
07.57.Ty
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Received: 21 February 2011
Published: 29 May 2011
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PACS: |
78.20.Ci
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(Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))
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82.80.Dx
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(Analytical methods involving electronic spectroscopy)
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07.57.Ty
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(Infrared spectrometers, auxiliary equipment, and techniques)
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