Fiber Fabry-Perot sensors for detection of partial discharges in power transformers.
A diaphragm-based interferometric fiberoptic sensor that uses a low-coherence light source was designed and tested for on-line detection of the acoustic waves generated by partial discharges inside high-voltage power transformers. The sensor uses a fused-silica diaphragm and a single-mode optical fiber encapsulated in a fused-silica glass tube to form an extrinsic Fabry-Perot interferometer, which is interrogated by low-coherence light. Test results indicate that these fiber optic acoustic sensors are capable of faithfully detecting acoustic signals propagating inside transformer oil with high sensitivity and wide bandwidth.
Yu
Bing
B
Center for Photonics Technology, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0287, USA. biyu@vt.edu
Kim
Dae Woong
DW
Deng
Jiangdong
J
Xiao
Hai
H
Wang
Anbo
A