Construction of trace hydrogen detection system based on distributed feedback fiber laser

This paper proposes a trace hydrogen sensing system based on distributed feedback fiber laser (DFB-FL). The sensor head was fabricated by inserting the DFB-FL into a glass capillary coated with hydrogen sensitive material. The wavelength of the DFB-FL changed under the exothermic reaction of Pt-WO3...

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Bibliographic Details
Published in:Optical engineering 2024-03, Vol.63 (3), p.036102-036102
Main Authors: Chu, FengHong, Sun, YiSheng, Bian, ZhengLan, Zhang, GuiLin, Pei, Dan, Miao, XiaoKang, Xue, Liang, Hu, AnDuo
Format: Article
Language:English
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Summary:This paper proposes a trace hydrogen sensing system based on distributed feedback fiber laser (DFB-FL). The sensor head was fabricated by inserting the DFB-FL into a glass capillary coated with hydrogen sensitive material. The wavelength of the DFB-FL changed under the exothermic reaction of Pt-WO3 with hydrogen and was demodulated by a Michelson interferometer. The experimental results at hydrogen concentration of 50 to 3800 ppm show that the hydrogen sensitivity of the system is 0.0386  pm/ppm and the linearity index R2 is >0.99. The repeatability of the system is 99.4% and the accuracy is 97.43% at hydrogen concentration of 50 ppm. The figure of merit of the system is 0.0385. The proposed DFB-FL sensor with good repeatability and anti-electronic interference has application prospects in many fields such as the detection of trace hydrogen in transformer oil.
ISSN:0091-3286
1560-2303
DOI:10.1117/1.OE.63.3.036102