Ultra-Compact Optical Fiber Gas Sensor With High Sensitivity, Fast Response and Large Dynamic Range
We report a miniature optical fiber photothermal (PT) gas sensor with high sensitivity, fast response and large dynamic range. The sensing region is an air gap formed between the cleaved ends of two single mode fibers (SMFs). Theoretical formulations of photothermal phase modulation and interferomet...
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Published in | Journal of lightwave technology Vol. 42; no. 7; pp. 2617 - 2624 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
New York
IEEE
01.04.2024
The Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
Subjects | |
Online Access | Get full text |
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Summary: | We report a miniature optical fiber photothermal (PT) gas sensor with high sensitivity, fast response and large dynamic range. The sensing region is an air gap formed between the cleaved ends of two single mode fibers (SMFs). Theoretical formulations of photothermal phase modulation and interferometric phase detection are presented. Numerical simulation and experimental investigation are carried out to optimize the system parameters to maximize the photothermal signal. A gas sensor with an air gap of 130 µm demonstrates a noise equivalent concentration of 45 parts per billion and dynamic range of <inline-formula><tex-math notation="LaTeX">\text{2} \times \text{10}^7</tex-math></inline-formula> for acetylene detection, with a response time of 0.9 s. The sensor is simple to construct and may be used for real-time gas detection in a confined space. |
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ISSN: | 0733-8724 1558-2213 |
DOI: | 10.1109/JLT.2023.3337411 |