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Proceedings Paper

Fiber optic Sagnac interferometer for on-line acoustic emission monitoring of high-temperature power plant structures
Author(s): Thomas A. Carolan; R. L. Reuben; James S. Barton; Julian D. C. Jones
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Paper Abstract

This paper details the design of a non-contact fiber optic sensor for the detection of acoustic emission for structural integrity monitoring in high temperature power plant applications. The sensor is based on a Sagnac interferometer and produces an output proportional to target velocity, without the need for active phase stabilization. It is inherently insensitive to low frequency perturbations of the instrument or the target and incorporates an environmentally insensitive downlead which may be of arbitrary length. It is shown that the sensor is capable of meeting the specifications for structural integrity monitoring of high temperature power plant components based on acoustic emission detection and has a velocity resolution of 50 nms-1Hz-1/2.

Paper Details

Date Published: 23 August 1996
PDF: 10 pages
Proc. SPIE 2868, Second International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (23 August 1996); doi: 10.1117/12.248678
Show Author Affiliations
Thomas A. Carolan, Heriot-Watt Univ. (United Kingdom)
R. L. Reuben, Heriot-Watt Univ. (United Kingdom)
James S. Barton, Heriot-Watt Univ. (United Kingdom)
Julian D. C. Jones, Heriot-Watt Univ. (United Kingdom)


Published in SPIE Proceedings Vol. 2868:
Second International Conference on Vibration Measurements by Laser Techniques: Advances and Applications
Enrico Primo Tomasini, Editor(s)

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