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Sensors 2017, 17(9), 2144;

A New Hydrogen Sensor Based on SNS Fiber Interferometer with Pd/WO3 Coating

College of Information Science and Engineering, Northeastern University, Shenyang 110819, China
State Key Laboratory of Synthetical Automation for Process Industries, Shenyang 110819, China
Author to whom correspondence should be addressed.
Received: 27 July 2017 / Revised: 11 September 2017 / Accepted: 15 September 2017 / Published: 18 September 2017
(This article belongs to the Special Issue Novel Approaches to Biosensing with Nanoparticles)
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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. View Full-Text
Keywords: fiber interferometer; no core fiber (NCF); hydrogen sensor; Pd/WO3 film fiber interferometer; no core fiber (NCF); hydrogen sensor; Pd/WO3 film

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Shao, J.; Xie, W.; Song, X.; Zhang, Y. A New Hydrogen Sensor Based on SNS Fiber Interferometer with Pd/WO3 Coating. Sensors 2017, 17, 2144.

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