Ms. Lingxi Xiong Profile

Lingxi Xiong

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Proceedings Article | 19 December 2022 Presentation + Paper

Rapid response of Raman gas sensing based on node-less anti-resonant fiber

Minghong Yang, Yongxin Ye, Yong Zhou, Zhixiong Liu, Lingxi Xiong, Donglai Guo

Proceedings Volume 12321, 123210I (2022) https://doi.org/10.1117/12.2643735

KEYWORDS: Optical fibers, Raman spectroscopy, Gases, Hydrogen

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High-sensitivity sensing of multi-component gases has important applications in environmental monitoring, industrial process control, and biomedical analysis. Fiber-enhanced gas Raman spectroscopy based on node-less anti-resonant hollow-core fibers (AR-HCFs) has advantages for the detection of multi-component gases. AR-HCFs can significantly improve the collection efficiency of gas signals, but the diffusion rate of gas in AR-HCFs is slow under normal pressure, and the gas exchange in AR-HCFs requires the help of gas pressure control devices. In this work, a reflective fiber-enhanced gas Raman system is designed and only one end of the hollow-core fiber is coupled to the optical path, the other end is placed in free space which facilitates rapid gas exchange. Various gases such as CH₄, H₂, N₂, NH₃, etc. are injected into optical fibers for systematic research. It takes 70 s to fill the 0.5m-long AR-HCFs with hydrogen at 1.2 Bar, but only 8 s at 1.6 Bar. Due to the influence of the gas viscosity coefficient, the time required for CH₄ to fulfill 1m-long AR-HCFs is about 1.4 times that of H₂ under the same environment. It is proved that such an optical fiber-enhanced gas Raman system can realize fast gas filling and exchange, and has good detection ability for multi-component gas, which can be used in fields requiring the quick response of gas sensing.

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