Title :
Angular Dependence of the Frequency Response of an Extrinsic Fabry–PÉrot Interferometric (EFPI) Fiber Acoustic Sensor for Partial Discharge Detection
Author :
Song, Lijun ; Wang, Zhuang ; Wang, Anbo ; Liu, Yilu ; Cooper, Kristie L.
Author_Institution :
Center for Photonics Technol., Virginia Tech. Center, Blacksburg, VA
Abstract :
Extrinsic Fabry-Peacuterot interferometric (EFPI) fiber acoustic sensors have been successfully employed in partial discharge detection in a power transformer. In this paper, the angular dependence of the sensor´s frequency response is investigated. The interaction between the applied pressure and the EFPI fiber sensor immersed in a fluid was modeled by finite element methods. The angular dependence of the sensor´s frequency response was obtained by a coupled structure acoustic analysis in ANSYS and compared to both the soft baffle and unbaffled models and experimental results in a 1-m tank. The measured bandwidth of the sensor´s angular dependence of the frequency response is in good agreement with the simulation results with a plusmn3deg 3-dB bandwidth difference and a 0.4-dB difference within a plusmn45deg incident range
Keywords :
Fabry-Perot interferometers; acoustic transducers; fibre optic sensors; finite element analysis; partial discharge measurement; power transformers; extrinsic Fabry-Perot interferometric fiber acoustic sensor; finite element methods; partial discharge detection; power transformer; Acoustic measurements; Acoustic sensors; Acoustic signal detection; Bandwidth; Coupled mode analysis; Finite element methods; Frequency response; Optical fiber sensors; Partial discharges; Power transformers; Angular dependence of frequency response; extrinsic Fabry–PÉrot interferometer; fiber acoustic sensor; finite element method (FEM); partial discharge detection; power transformer;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2006.878513
