Study on long distance transmission technique of weak photocurrent signal in laser gas sensor |
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| Authors: | Liming Wang Yujun Zhang Hongbin Li Yi Zhou Kun You Ying He and Wenqing Liu |
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| Institution: | 1 Key Laboratory of Environmental Optics and Technology,Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Hefei 230031,China 2 Key Laboratory of Pulsed Power Laser Technology,Institute of Electronic Engineering,Hefei 230037,China |
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| Abstract: | 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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