Abstract
The presence of H2S ( hydrogen sulphide ) gas in oil and gas exploration can give rise to critical safety problems because of its corrosivity and toxicity. In order to protect people and equipment, there is a need for a real-time,remote and reliable seneor that can detcet the concentration of H2S gas. The best way to monitor H2S gas concentration is optical-electrochemical sensor technology. At present, the optical-electrochemical method detects the H2S gas concentration. Yet this detector has adequated low sensitivity and weak detection signal which can not be used for remote transmission. To overcome this problem, this paper presents a new optical-electrochemical method based on optical guided wave field. The method is that H2S is combined with specific chemicals and they set off a chemical reaction, which changes the propagation characteristic of light. So the concentration of H2S gas is detected by detecting the change of optical guided wave field. This method improves the detection sensitivity and SNR (signal to noise ratio). The method provides theoretical basis for monitoring the H2S gas concentration over a large area and long distance.
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