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Sensors 2017, 17(2), 379; doi:10.3390/s17020379

Detection of Atmospheric Methyl Mercaptan Using Wavelength Modulation Spectroscopy with Multicomponent Spectral Fitting

1
State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin 300072, China
2
Key Laboratory of Advanced Electrical Engineering and Energy Technology, Tianjin Polytechnic University, Tianjin 300387, China
*
Author to whom correspondence should be addressed.
Academic Editors: Paul A. Solomon and Melissa Lunden
Received: 23 October 2016 / Revised: 10 January 2017 / Accepted: 24 January 2017 / Published: 16 February 2017
(This article belongs to the Special Issue Air Pollution Sensors: A New Class of Tools to Measure Air Quality)
View Full-Text   |   Download PDF [3931 KB, uploaded 16 February 2017]   |  

Abstract

Detection of methyl mercaptan (CH3SH) is essential for environmental atmosphere assessment and exhaled-breath analysis. This paper presents a sensitive CH3SH sensor based on wavelength modulation spectroscopy (WMS) with a mid-infrared distributed feedback interband cascade laser (DFB-ICL). Multicomponent spectral fitting was used not only to enhance the sensitivity of the sensor but also to determine the concentration of interferents (atmospheric water and methane). The results showed that the uncertainties in the measurement of CH3SH, H2O, and CH4 were less than 1.2%, 1.7% and 2.0%, respectively, with an integration time of 10 s. The CH3SH detection limit was as low as 7.1 ppb with an integration time of 295 s. Overall, the reported sensor, boasting the merits of high sensitivity, can be used for atmospheric methyl mercaptan detection, as well as multiple components detection of methyl mercaptan, water, and methane, simultaneously. View Full-Text
Keywords: methyl mercaptan sensor; distributed feedback interband cascade laser (DFB-ICL); multicomponent spectral fitting; wavelength modulation spectroscopy (WMS); mid-infrared spectroscopy methyl mercaptan sensor; distributed feedback interband cascade laser (DFB-ICL); multicomponent spectral fitting; wavelength modulation spectroscopy (WMS); mid-infrared spectroscopy
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Du, Z.; Wan, J.; Li, J.; Luo, G.; Gao, H.; Ma, Y. Detection of Atmospheric Methyl Mercaptan Using Wavelength Modulation Spectroscopy with Multicomponent Spectral Fitting. Sensors 2017, 17, 379.

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