An optical sensor for hydrogen sulfide detection in open path using WMS-2f/1f technique
An optical hydrogen sulfide (H2S) sensor based on wavelength modulation spectroscopy with the second harmonic (2f) corrected by the first harmonic (1f) signal (WMS-2f/1f) is developed using a distributed feedback (DFB) laser emitting at 1.578 μm and a homemade gas cell with 1-m-long optical path length. The novel sensor is constructed by an electrical cabinet and an optical reflecting and receiving end. The DFB laser is employed for targeting a strong H2S line at 6 336.62 cm-1in the fundamental absorption band of H2S. The sensor performance, including the minimum detection limit and the stability, can be improved by reducing the laser intensity drift and common mode noise by means of the WMS-2f/1f technique. The experimental results indicate that the linearity and response time of the sensor are 0.999 26 and 6 s (in concentration range of 15.2—45.6 mg/m3), respectively. The maximum relative deviation for continuous detection (60 min) of 30.4 mg/m3H2S is 0.48% and the minimum detection limit obtained by Allan variance is 79 μg/m3with optimal integration time of 32 s. The optical H2S sensor can be applied to environmental monitoring and industrial production, and it has significance for real-time online detection in many fields.
基金项目：This work has been supported by the National Natural Science Foundation of China (Nos.60808020 and 61078041), the Natural Science Foundation of Tianjin (Nos.16JCQNJC02100, 15JCYBJC51700 and 16JCYBJC15400), and the National Science and Technology Support(No.2014BAH03F01).
LIU Li-wen：Key Laboratory of Advanced Electrical Engineering and Energy Technology, Tianjin Polytechnic University, Tianjin 300387, China
YANG Yan-gang：Tianjin University of Technology and Education, Tianjin 300222, China
GUO Qing-hua：Key Laboratory of Advanced Electrical Engineering and Energy Technology, Tianjin Polytechnic University, Tianjin 300387, China
XI Jiang-tao：School of Electrical, Computer and Telecommunications Engineering, University of Wollongong, Wollongong 2500, Australia
【1】Qian Zhang and Wenqing Liu, Chemical Engineering & Equipment 5, 151 (2011). (in Chinese)
【2】Dong-Peng Li, Jin-Feng Zhang, Jie Cui, Xiao-Feng Ma, Jin-Ting Liu, Jun-Ying Miao and Bao-Xiang Zhao, Sensors and Actuators B: Chemical 234, 231 (2016).
【3】Gonge Tang, Cailan Zhao, Jie Gao and Hongliang Tan, Sensors and Actuators B: Chemical 237, 795 (2016).
【4】Peng Yi-jie, Liu Mu-hua, Zhao Jin-hui, Li Yao, Tao Jin-jiang and Guo Hong-qing, Journal of Optoelectronics ·Laser 27, 845 (2016). (in Chinese)
【5】Chen Xiang, Kan Rui-feng, Yang Chen-guang, Xu Zhen-yu, Zhang Guang-le, Chen Fu-duo and Liu Jian-guo, Journal of Optoelectronics·Laser 26, 719 (2015). (in Chinese)
【6】S. Neethu, R. Verma, S. S. Kamble, J. K. Radhakrishnan, P. P. Krishnapur and V. C. Padaki, Sensors and Actuators B: Chemical 192, 70 (2014).
【7】Ritobrata Sur, Kai Sun, Jay B. Jeffries, John G. Socha and Ronald K. Hanson, Fuel 150, 102 (2015).
【8】J. Shao, J. Jie, L. M. Wang, C. F. Ying and Z. Zhou, Optics Communications 336, 67 (2015).
【9】A. Hartmann, R. Strzoda, R. Schrobenhauser and R. Weigel, Journal of Quantitative Spectroscopy and Radiative Transfer 133, 619 (2014).
【11】Lu Wang, Chunxi Zhang, Tie Lin, Xianmu Li and Tao Wang, Measurement 75, 263 (2015).
SONG Li-mei,LIU Li-wen,YANG Yan-gang,GUO Qing-hua,XI Jiang-tao. An optical sensor for hydrogen sulfide detection in open path using WMS-2f/1f technique[J]. 光电子快报（英文版）, 2016, 12(6): 465-468
SONG Li-mei,LIU Li-wen,YANG Yan-gang,GUO Qing-hua,XI Jiang-tao. An optical sensor for hydrogen sulfide detection in open path using WMS-2f/1f technique[J]. Optoelectronics Letters, 2016, 12(6): 465-468