Interferometric differential strain sensor: the smart strut

David A. Brown; Steven L. Garrett

doi:10.1117/12.24851

1 December 1990 Interferometric differential strain sensor: the smart strut

David A. Brown, Steven L. Garrett

Proceedings Volume 1370, Fiber Optic Smart Structures and Skins III; (1990) https://doi.org/10.1117/12.24851
Event: SPIE Microelectronic Interconnect and Integrated Processing Symposium, 1990, San Jose, United States

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.

Citation Download Citation

David A. Brown and Steven L. Garrett "Interferometric differential strain sensor: the smart strut", Proc. SPIE 1370, Fiber Optic Smart Structures and Skins III, (1 December 1990); https://doi.org/10.1117/12.24851

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