title: Fiber Fabry-Perot sensors for detection of partial discharges in power transformers.
abstract: 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.
authors.affiliation: Center for Photonics Technology, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061-0287, USA. biyu@vt.edu
authors.forename: Bing
authors.initials: B
authors.lastname: Yu
authors.forename: Dae Woong
authors.initials: DW
authors.lastname: Kim
authors.forename: Jiangdong
authors.initials: J
authors.lastname: Deng
authors.forename: Hai
authors.initials: H
authors.lastname: Xiao
authors.forename: Anbo
authors.initials: A
authors.lastname: Wang