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Sensors 2016, 16(10), 1641; doi:10.3390/s16101641

Research on High Sensitive D-Shaped FBG Hydrogen Sensors in Power Transformer Oil

1
Electric Power Research Institute of Guangdong Power Grid Co., Ltd., Guangzhou 510080, China
2
State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China
*
Author to whom correspondence should be addressed.
Received: 17 July 2016 / Accepted: 15 September 2016 / Published: 4 October 2016
(This article belongs to the Special Issue Recent Advances in Fiber Bragg Grating Sensing)
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Abstract

Dissolved hydrogen is a symbol gas decomposed by power transformer oil for electrical faults such as overheat or partial discharges. A novel D-shaped fiber Bragg grating (D-FBG) sensor is herein proposed and was fabricated with magnetron sputtering to measure the dissolved hydrogen concentration in power transformer oil in this paper. Different from the RI (refractive index)-based effect, D-FBG in this case is sensitive to curvature caused by stress from sensing coating, leading to Bragg wavelength shifts accordingly. The relationship between the D-FBG wavelength shift and dissolved hydrogen concentration in oil was measured experimentally in the laboratory. The detected sensitivity could be as high as 1.96 μL/L at every 1-pm wavelength shift. The results proved that a simple, polished FBG-based hydrogen sensor provides a linear measuring characteristic in the range of low hydrogen concentrations in transformer oil. Moreover, the stable hydrogen sensing performance was investigated by X-ray diffraction analysis. View Full-Text
Keywords: FBG; dissolved hydrogen concentration; power transformer oil; curvature; sensitivity FBG; dissolved hydrogen concentration; power transformer oil; curvature; sensitivity
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Luo, Y.-T.; Wang, H.-B.; Ma, G.-M.; Song, H.-T.; Li, C.; Jiang, J. Research on High Sensitive D-Shaped FBG Hydrogen Sensors in Power Transformer Oil. Sensors 2016, 16, 1641.

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