Hydrogen and temperature measurement using a functionalized superstructure of Bragg gratings in a helical-core fiber

•Utilize two distinct spectral structures for detection of hydrogen and temperature.•Optimized sensitivity by modifying the device dimensions via wet etching technique.•Be reusable thanks to the reversable reactions between H2 and palladium.•Eliminate the spark/discharge that may induce explosion ba...

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Bibliographic Details
Published in:Optics and laser technology 2024-07, Vol.174, p.110551, Article 110551
Main Authors: Zhi, Yanyan, Hu, Yanyu, Chen, Hao, Zhang, Shuling, Li, Jie, Liang, Hao, Wu, Chuang, Guan, Bai-Ou
Format: Article
Language:English
Subjects:
Bragg grating
Helical-core fiber
Microsensors
Optical fiber devices
Sensitivity
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Summary:•Utilize two distinct spectral structures for detection of hydrogen and temperature.•Optimized sensitivity by modifying the device dimensions via wet etching technique.•Be reusable thanks to the reversable reactions between H2 and palladium.•Eliminate the spark/discharge that may induce explosion based on electric signals. As decarbonization is urgent in global climate, hydrogen, of which the product is pure water after burning, becomes a potentially clean and sustainable energy source as a replacement for fossil fuels. However, the hydrogen storge is challenging due to the highly flammable and explosive properties, limiting its enormous applications in industries. Real-time and sensitive detection of hydrogen is thus imperative to avoid leakage accidents, while the sensors based on electric signals have the risk of spark or arc discharge which may induce explosion. Here, we propose and experimentally demonstrate an optical hydrogen sensor using a functionalized superstructure of Bragg gratings in a helical-core fiber with a thin palladium film. Due to the cross sensing of the two sets of gratings, simultaneous detection of hydrogen concentration and temperature can be realized. By modifying the device diameter using wet etching technique, the sensitivity of hydrogen concentration is enhanced by 2.7 times. The utilization of the superstructure of Bragg gratings sampled in the helical-core fiber provides a promising platform for reliable and safe sensing of hydrogen with the ability of simultaneous monitoring of temperature.
ISSN:0030-3992
1879-2545
DOI:10.1016/j.optlastec.2024.110551