期刊
SENSORS
卷 17, 期 9, 页码 -出版社
MDPI
DOI: 10.3390/s17092144
关键词
fiber interferometer; no core fiber (NCF); hydrogen sensor; Pd/WO3 film
资金
- National Science Foundation for Distinguished Young Scholars of China [61425003]
- National Natural Science Foundation of China [61703080, 61273059]
- Fundamental Research Funds for the Central Universities [N160404012]
- Liaoning Province Natural Science Foundation [20170540314]
- major scientific project of undergraduate [ZD1712]
- State Key Laboratory of Synthetical Automation for Process Industries [2013ZCX09]
This paper presents a new hydrogen sensor based on a single mode-no core-single mode (SNS) fiber interferometer structure. The surface of the no core fiber (NCF) was coated by Pd/WO3 film to detect the variation of hydrogen concentration. If the hydrogen concentration changes, the refractive index of the Pd/WO3 film as well as the boundary condition for light propagating in the NCF will all be changed, which will then cause a shift into the resonant wavelength of interferometer. Therefore, the hydrogen concentration can be deduced by measuring the shift of the resonant wavelength. Experimental results demonstrated that this proposed sensor had a high detection sensitivity of 1.26857 nm/%, with good linearity and high accuracy (maximum 0.0055% hydrogen volume error). Besides, it also possessed the advantages of simple structure, low cost, good stability, and repeatability.
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