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Proceedings Paper

Nondestructive dynamic complex moduli measurements using a Michelson fiber interferometer and a resonant bar technique
Author(s): David A. Brown; Beng-Hock Tan; Steven L. Garrett
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Paper Abstract

An optical fiber, used as a leg of a Michelson interferometer, is cast into a long cylindrical bar of E-CAST F-82 epoxy. The bar can be selectively excited in any of its lowest flexural, torsional, and longitudinal modes. The interferometer is used to detect the resonant modes of the 'free-free' bar and from these modes both the Young's and shear elastic moduli are determined. The complex modulus is determined by measuring the quality factor Q for each resonant mode. The measurement technique is entirely nondestructive, and yields results of two independent moduli with the same transducers.

Paper Details

Date Published: 1 December 1990
PDF: 10 pages
Proc. SPIE 1370, Fiber Optic Smart Structures and Skins III, (1 December 1990); doi: 10.1117/12.24845
Show Author Affiliations
David A. Brown, Naval Postgraduate School (United States)
Beng-Hock Tan, 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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