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Sensors 2017, 17(9), 2144; https://doi.org/10.3390/s17092144

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

1
College of Information Science and Engineering, Northeastern University, Shenyang 110819, China
2
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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Abstract

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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