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Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/372

Title: Directionality of an optical fiber high-frequency acoustic sensor for partial discharge detection and location
Authors: Zhao, Zhiqiang
MacAlpine, Mark
Demokan, Suleyman
Subjects: Acoustic signal detection
Acoustooptic measurements
Optical fiber transducers
Partial discharges
Issue Date: Jun-2000
Publisher: IEEE
Citation: Journal of lightwave technology, June 2000, v. 18, no. 6, p. 795-806
Abstract: Fiber-optic acoustic sensors are being developed for the detection and location of partial discharges in oil-filled transformers. The partial discharges can be detected acoustically and located by the triangulation method with the sensors placed inside the transformer tank. In this application, the directionality of the sensor should be as flat as possible within at least ±40° from the sensor axis and for a frequency range up to 150 kHz. A calculation of the directionality of a fiber coil acoustic sensor was made using a plane wave approximation. The calculation showed that if the diameter of a fiber coil is less than 20 mm, its directionality is relatively flat within ±40° for frequencies lower than 150 kHz.
The directionality of an optical fiber acoustic sensor for the frequency range of 50-300 kHz was measured experimentally in an oil tank. The effect of reflected waves was avoided by using a gating technique. The experimental results show somewhat different directionality patterns from the theoretical results but are internally consistent and with maxima and minima at frequencies close to those predicted. The discrepancy is believed to be due to a resonance effect which is not taken into account in the theoretical model. However, the sensor achieves the directionality performance required for the application.
Rights: © 2000 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder.
Type: Journal/Magazine Article
URI: http://hdl.handle.net/10397/372
ISSN: 07338724
Appears in Collections:EE Journal/Magazine Articles

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