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Proceedings Paper

Interferometric Measurement And Calibration Of Dc Strain Of A Fiber Optic Embedded Graphite Epoxy Composite Panel
Author(s): Keith H. Wanser; Tom D. Wang
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Paper Abstract

Measurements of DC strain produced by transverse deflection of a fiber optic embedded graphite/ bismaleimide composite panel in cantilever geometry were made using a Mach Zehnder interferometer and active homodyne demodulation technique. The measured strain ranged from an average longitudinal strain of 2.0 x 10-4 to 6.6 x 10-7, corresponding to a maximum transverse deflection of 0.3 inches (3%) and a minimum transverse deflection of 0.001 inches respectively. We find that the strain optic coefficient of the embedded fiber ranges from 30% to 40% less than the value for uniaxial strain. In addition, these measurements reveal hysteresis and or creep during the loading and unloading cycle of the composite. Experiments were performed to determine sources of DC drift, and the main sources of DC drift identified. Calibration of the results is discussed as well as future modifications that will permit four orders of magnitude increase in tracking range, greatly improved interferometer stability, and elimination of the effects of piezoelectric hysteresis on the measurement of strain.

Paper Details

Date Published: 5 February 1990
PDF: 11 pages
Proc. SPIE 1170, Fiber Optic Smart Structures and Skins II, (5 February 1990); doi: 10.1117/12.963116
Show Author Affiliations
Keith H. Wanser, California State University Fullerton (United States)
Tom D. Wang, Dynamics Technology Inc. (United States)


Published in SPIE Proceedings Vol. 1170:
Fiber Optic Smart Structures and Skins II
Eric Udd, Editor(s)

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