Performance of fiber hydrogen sensor based on π-shifted fiber Bragg grating coated with Pd/Ta composite films of different thicknesses

Wenxin Ao; Minghong Yang; Fan Zhang; Wenbin Hu; Jixiang Dai

doi:10.1117/12.2687369

27 November 2023 Performance of fiber hydrogen sensor based on π-shifted fiber Bragg grating coated with Pd/Ta composite films of different thicknesses

Wenxin Ao, Minghong Yang, Fan Zhang, Wenbin Hu, Jixiang Dai

Author Affiliations +

Proceedings Volume 12771, Advanced Sensor Systems and Applications XIII; 127710K (2023) https://doi.org/10.1117/12.2687369
Event: SPIE/COS Photonics Asia, 2023, Beijing, China

Abstract

Rapid and accurate detection of hydrogen in anaerobic condition is more and more important for the safe production and operation of hydrogen energy. A novel fiber hydrogen sensor based on Pd/Ta composite film coating on π-shifted fiber Bragg grating is proposed and its sensing performance is evaluated experimentally. Due to the narrow reflective peak of π-shifted fiber Bragg grating, the proposed sensor has, shown higher accuracy on wavelength shift tracing. A Pd/Ta composite film was deposited on the side of π-shifted fiber Bragg grating by magnetron sputtering process. Compared with the grating hydrogen sensors of other Pd-based composite films, the hydrogen sensitivity and response time of the Pd/Ta composite film coated sensors with different thickness of sensing layer have been improved greatly. When the hydrogen concentration is 1%, The wavelength shifts of π-shifted fiber Bragg grating of Pd/Ta membrane with thicknesses of 100 nm, 200 nm, 300 nm and 800 nm are 16, 31, 50 and 115 pm, respectively, and the response time are 63, 71, 109 and 150 s, respectively. A longtime testing of the sensor proves that the sensor has good long-term stability and repeatability. The proposed hydrogen sensor with Pd/Ta composite film has great potential in the quasi-distributed monitoring of hydrogen leakage in hydrogen generation, refueling stations, and so on.

Citation Download Citation

Wenxin Ao, Minghong Yang, Fan Zhang, Wenbin Hu, and Jixiang Dai "Performance of fiber hydrogen sensor based on π-shifted fiber Bragg grating coated with Pd/Ta composite films of different thicknesses", Proc. SPIE 12771, Advanced Sensor Systems and Applications XIII, 127710K (27 November 2023); https://doi.org/10.1117/12.2687369

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KEYWORDS

Hydrogen

Sensors

Fiber Bragg gratings

Fiber optics sensors

Film thickness

Composites

Metals

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