Abstract
The continuous monitoring of H<sub>2</sub>S 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 H<sub>2</sub>S 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 H<sub>2</sub>S in natural gas desulfurization process.
© 2012 Chinese Optics Letters
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