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Title: Directionality of an optical fiber high-frequency acoustic sensor for partial discharge detection and location
Authors: Zhao, Z
MacAlpine, M
Demokan, S
Issue Date: Jun-2000
Source: 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.
Keywords: Acoustic signal detection
Acoustooptic measurements
Optical fiber transducers
Partial discharges
Publisher: Institute of Electrical and Electronics Engineers
Journal: Journal of lightwave technology 
ISSN: 0733-8724
EISSN: 1558-2213
DOI: 10.1109/50.848388
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.
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