An optical sensor for hydrogen sulfide detection in open path using WMS-2f/1f technique

SONG Li-mei; LIU Li-wen; YANG Yan-gang; GUO Qing-hua; XI Jiang-tao

doi:doi:10.1007/s11801-016-6170-7

光电子快报（英文版）, 2016, 12 (6): 465, Published Online: Oct. 12, 2017

An optical sensor for hydrogen sulfide detection in open path using WMS-2f/1f technique

论文大纲

SONG Li-mei ^1,*LIU Li-wen ¹YANG Yan-gang ²GUO Qing-hua ¹XI Jiang-tao ³

Author Affiliations

¹ Key Laboratory of Advanced Electrical Engineering and Energy Technology, Tianjin Polytechnic University, Tianjin 300387, China

² Tianjin University of Technology and Education, Tianjin 300222, China

³ School of Electrical, Computer and Telecommunications Engineering, University of Wollongong, Wollongong 2500, Australia

Abstract

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.

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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.

An optical sensor for hydrogen sulfide detection in open path using WMS-2f/1f technique

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