中国物理B ›› 2019, Vol. 28 ›› Issue (6): 63301-063301.doi: 10.1088/1674-1056/28/6/063301
• SPECIAL TOPIC—Recent advances in thermoelectric materials and devices • 上一篇 下一篇
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)
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
摘要:
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.
中图分类号: (Infrared spectra)