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Compact phase-shifted Sagnac interferometer for ultrasound detection

✍ Scribed by P.A. Fomitchov; S. Krishnaswamy; J.D. Achenbach

Book ID
104160096
Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
628 KB
Volume
29
Category
Article
ISSN
0030-3992

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✦ Synopsis

A compact fibre, phase-shifted Sagnac interferometer for ultrasound detection has been developed. The interferometer is a truly path-matched device, and therefore requires no path stabilization or heterodyning.

It is a less expensive and more robust alternative to the heterodyne or path-stabilized Michelson interferometer. The device provides high spatial resolution of ultrasonic detection. It has been used in conjunction with conventional piezoelectric transducers (PZT) to detect Rayleigh and Lamb waves and to image a crack in a thin plate, rivet cracks in riveted plates, and for ultrasonic beam profiling. @ 1998 Elsevier Science Ltd.

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## Abstract A fiber optic sensor based on Sagnac interferometer for determining the position of disturbance is presented. For this application, a disturbance simultaneously imposed on two different points of sensing fiber loop could be measured and located. The method solves the problem of isolatin