Wide dynamic detection range of methane gas based on enhanced cavity absorption spectroscopy |
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| Affiliation: | 1.Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230026, China;2.University of Science and Technology of China, Hefei 230026, China;3.Anhui Advanced Spectroscopy Optical-electric S&T Co., Ltd |
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| Abstract: | Integrated cavity output spectroscopy (ICOS) is an effective technique in trace gase detection. The strong absorption due to the long optical path of this method makes it challenging in the application scenes that have large gas concentration fluctuation, especially when the gas concentration is high. In this paper, we demonstrate an extension of the dynamic range of ICOS by using a detuned laser combined with an off-axis integrating cavity. With this, we improve the upper limit of the dynamic detection range from 0.1% (1000 ppm) to 20% of the gas concentration. This method provides a way of using ICOS in the applications with unpredictable gas concentrations such as gas leak detection, ocean acidification, carbon sequestration, etc. |
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| Keywords: | integrated cavity output spectroscopy (ICOS) trace gas wide dynamic detection absorption positions |
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