Study on long distance transmission technique of weak photocurrent signal in laser gas sensor | Zendy

Liming Wang | Zendy; Yujun Zhang | Zendy; Hongbin Li | Zendy; Yi Zhou | Zendy; Kun You | Zendy; Ying He | Zendy; Wenqing Liu | Zendy

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Study on long distance transmission technique of weak photocurrent signal in laser gas sensor

Author(s) -

Liming Wang,

Yujun Zhang,

Hongbin Li,

Yi Zhou,

Kun You,

Ying He,

Wenqing Liu

Publication year - 2012

Publication title -

chinese optics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.617

H-Index - 37

ISSN - 1671-7694

DOI - 10.3788/col201210.042802

Subject(s) - optics , photocurrent , transmission (telecommunications) , signal (programming language) , laser , materials science , optoelectronics , physics , telecommunications , computer science , programming language

The continuous monitoring of H2S gas concentration is a common problem in natural gas desulfurization process technology.Tunable diode laser absorption spectroscopy(TDLAS)is a preferred technology for continuous monitoring of gas in industrial sites,because of its high selectivity,high sensitivity,and fast response.We discuss the technical solutions of on-line monitoring of H2S in natural gas desulfurization process technology based on TDLAS,and study the security design of monitoring system in inflammable and explosive areas.We also design a weak photocurrent signal converting circuit and perform experiments on transmission characteristics of different distances.The signal-to-noise ratio(SNR)of laser absorption spectrum does not decrease after the 1 500-m transmission.The detection limit is 300 ppb.The system can be operated stably and reliably,and satisfies the need for continuous monitoring of the H2S in natural gas desulfurization process.

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