Influential factors analysis on photoacoustic signal of photoacoustic spectroscopy monitoring trace gases |
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| Authors: | CHEN Wei-gen LIU Bing-jie HU Jin-xing ZHOU Heng-yi and LI Jian |
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| Institution: | State Key Laboratory of Power Transmission Equipment &System Security and New Technology,Chongqing University, Chongqing 400044, China;;State Key Laboratory of Power Transmission Equipment &System Security and New Technology,Chongqing University, Chongqing 400044, China;;Chengqu Power Supply Bureau, Chongqing Electric Power Company, Chongqing 400014, China;State Key Laboratory of Power Transmission Equipment &System Security and New Technology,Chongqing University, Chongqing 400044, China;;State Key Laboratory of Power Transmission Equipment &System Security and New Technology,Chongqing University, Chongqing 400044, China; |
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| Abstract: | Photoacoustic spectroscopy (PAS) is a highly sensitive gas analyzing method without the shortcoming of gas consumption, which can be used in transformer oil trace gases dissolved in on line monitoring. The photoacoustic signal is detected with a microphone, which is the only feature in gas concentration analysis. A portable and tunable experimental setup has been developed based on the photoacoustic spectroscopy fundamental. Through the photoacoustic signal stimulate mechanism analysis, this paper thoroughly discusses the influences of gas pressure, temperature, laser power, gas concentration, background gas, chopped frequency and the resonant frequency drift on the gas photoacoustic signal. The theoretical and experimental results supply reference and technical support for further improvements in oil gas photoacoustic spectroscopy of on-line monitoring system. |
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| Keywords: | trace gases photoacoustic spectroscopy gas detection influence factors |
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