Wide dynamic detection range of methane gas based on enhanced cavity absorption spectroscopy

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 hig...

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Bibliographic Details
Published in:Chinese Physics B
Main Authors: Wang, Yu, Ding, Bo-Kun, Wang, Kun-Yang, Mei, Jiao-Xu, Han, Ze-Lin, Tan, Tu, Gao, Xiao-Ming
Format: Article in Journal/Newspaper
Language:unknown
Published: IOP Publishing 2022
Subjects:
Ocean acidification
Online Access:http://dx.doi.org/10.1088/1674-1056/ac2484
https://iopscience.iop.org/article/10.1088/1674-1056/ac2484
https://iopscience.iop.org/article/10.1088/1674-1056/ac2484/pdf
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Summary: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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