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Hydrogen sulphide detection using near-infrared diode laser and compact dense-pattern multipass cell |
Xing Tian(田兴)1,2, Yuan Cao(曹渊)1,2, Jia-Jin Chen(陈家金)1, Kun Liu(刘锟)1, Gui-Shi Wang(王贵师)1, Xiao-Ming Gao(高晓明)1 |
1 Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China;
2 University of Science and Technology of China, Hefei 230026, China |
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Abstract Sub-ppmv level detection of hydrogen sulphide (H2S) using a 1.578-μm distributed feedback tunable diode laser combining with wavelength modulation spectroscopy and second harmonic detection scheme is reported. A home-developed novel compact dense-pattern multipass gas cell with an effective optical path length of 29.37 m is used to improve sensitivity and reduce sample volume. Detection parameters are optimized, including modulation frequency and amplitude. The analysis of Allan variance shows that a minimum detectable concentration 60 ppbv is obtained with a lock-in time constant of 10 ms, and a detection limit of 13 ppbv can be achieved by average in 300 s. The demonstrated H2S sensor has a strong penitential application in natural gas process for regulating and controlling H2S concentration.
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Received: 11 March 2019
Revised: 11 April 2019
Accepted manuscript online:
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Fund: Project supported by the National Key Research and Development Program of China (Grant Nos. 2016YFC0303900 and 2017YFC0209700). |
Corresponding Authors:
Kun Liu
E-mail: liukun@aiofm.ac.cn
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Cite this article:
Xing Tian(田兴), Yuan Cao(曹渊), Jia-Jin Chen(陈家金), Kun Liu(刘锟), Gui-Shi Wang(王贵师), Xiao-Ming Gao(高晓明) Hydrogen sulphide detection using near-infrared diode laser and compact dense-pattern multipass cell 2019 Chin. Phys. B 28 063301
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