Fiber optic Sagnac interferometer for on-line acoustic emission monitoring of high-temperature power plant structures

Thomas A. Carolan; R. L. Reuben; James S. Barton; Julian D. C. Jones

doi:10.1117/12.248678

23 August 1996 Fiber optic Sagnac interferometer for on-line acoustic emission monitoring of high-temperature power plant structures

Thomas A. Carolan, R. L. Reuben, James S. Barton, Julian D. C. Jones

Author Affiliations +

Proceedings Volume 2868, Second International Conference on Vibration Measurements by Laser Techniques: Advances and Applications; (1996) https://doi.org/10.1117/12.248678
Event: Second International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, 1996, Ancona, Italy

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.

Citation Download Citation

Thomas A. Carolan, R. L. Reuben, James S. Barton, and Julian D. C. Jones "Fiber optic Sagnac interferometer for on-line acoustic emission monitoring of high-temperature power plant structures", Proc. SPIE 2868, Second International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (23 August 1996); https://doi.org/10.1117/12.248678

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