期刊
IEEE PHOTONICS TECHNOLOGY LETTERS
卷 27, 期 13, 页码 1453-1456出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2015.2425894
关键词
Side polished; dissolved hydrogen; power transformer oil; fiber Bragg grating; residual thickness
资金
- Fundamental Research Funds for the Central Universities
- Research Fund for the Doctoral Program of Higher Education of China
- Beijing Natural Science Foundation [3144035]
- China Southern Power Grid
- National Natural Science Foundation of China [51307052]
To eliminate the time-consuming oil-gas separation process in online dissolved gas detection of power transformer, fiber Bragg grating (FBG)-based hydrogen sensor is proposed to be installed into the power transformer oil directly. In the sensor design, the FBG cladding is side-polished with a residual thickness of 20 mu m and sputtered with palladium/silver. Since side-polished cladding is very sensitive to curvature strain induced by palladium in the presence of dissolved hydrogen, the proposed sensor is much more sensitive than the untreated FBG hydrogen sensor. Measurements prove that the sensitivity is as high as 0.477 (pm/(mu L/L)), about 11.4 times higher than the conventional FBG hydrogen sensor. Furthermore, repeatability and short-term stability have been investigated. The performances satisfy the actual need of monitoring dissolved hydrogen concentration in power transformer oil.
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