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Open AccessArticle

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.
Sensors 2016, 16(10), 1641; https://doi.org/10.3390/s16101641
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)
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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MDPI and ACS Style

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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