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Proceedings Paper

Interferometric differential strain sensor: the smart strut
Author(s): David A. Brown; Steven L. Garrett
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Paper Abstract

A fiber optic sensor is used to selectively detect a particular vibration mode of a cylindrical rod (strut) made from castable epoxy. Two optical fibers, comprising the legs of a Michelson interferometer, are cast into a long rod (1.33 cm diameter, 35.1 cm length) at a radial distance of 5.3 mm. The free-free rod is then electrodynamically driven to excite the lowest flexural, torsional, and longitudinal modes of vibration. As expected due to the placement of the fibers, the fundamental flexural mode was easily detected and the torsional and longitudinal modes were highly suppressed since the latter modes produced common mode signals in each interferometer leg. At the fundamental flexural resonance of the rod, (158.5 Hz), the correlation between measured transverse peak displacement (14.6 microns) and the measured number of strain induced optical fringes (14.5 at a wavelength of 817 nm) was in good agreement with theoretical predictions.

Paper Details

Date Published: 1 December 1990
PDF: 9 pages
Proc. SPIE 1370, Fiber Optic Smart Structures and Skins III, (1 December 1990); doi: 10.1117/12.24851
Show Author Affiliations
David A. Brown, Naval Postgraduate School (United States)
Steven L. Garrett, Naval Postgraduate School (United States)

Published in SPIE Proceedings Vol. 1370:
Fiber Optic Smart Structures and Skins III
Richard O. Claus; Eric Udd, Editor(s)

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