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Proceedings Paper

Plastic deformation analysis in metal using absolute optical fiber strain sensor
Author(s): Michael F. Gunther; Kent A. Murphy; Richard O. Claus; Tuan A. Tran
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Paper Abstract

An absolute displacement and strain measurement system has been used to characterize plastic deformation in metal specimens. Here, an absolute extrinsic Fabry-Perot interferometric (AEFPI) sensor system uses a modified EFPI sensor element head with support optical and electronic signal processing to give an output signal proportional to the instantaneous air gap length within the sensor element. This information may be used to determine the local axial strain if the gage length of the sensor is known. Because the system does not require a reference phase, the support electronics may be turned off and back on with no loss of optical fringe information or ambiguity in reference point. Applications in the long term monitoring of residual strain and creep are suggested.

Paper Details

Date Published: 1 May 1994
PDF: 6 pages
Proc. SPIE 2191, Smart Structures and Materials 1994: Smart Sensing, Processing, and Instrumentation, (1 May 1994); doi: 10.1117/12.173960
Show Author Affiliations
Michael F. Gunther, Virginia Polytechnic Institute and State Univ. (United States)
Kent A. Murphy, Virginia Polytechnic Institute and State Univ. (United States)
Richard O. Claus, Virginia Polytechnic Institute and State Univ. (United States)
Tuan A. Tran, Fiber and Sensor Technologies, Inc. (United States)


Published in SPIE Proceedings Vol. 2191:
Smart Structures and Materials 1994: Smart Sensing, Processing, and Instrumentation
James S. Sirkis, Editor(s)

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