Plastic deformation analysis in metal using absolute optical fiber strain sensor

Michael F. Gunther; Kent A. Murphy; Richard O. Claus; Tuan A. Tran

doi:10.1117/12.173960

1 May 1994 Plastic deformation analysis in metal using absolute optical fiber strain sensor

Michael F. Gunther, Kent A. Murphy, Richard O. Claus, Tuan A. Tran

Proceedings Volume 2191, Smart Structures and Materials 1994: Smart Sensing, Processing, and Instrumentation; (1994) https://doi.org/10.1117/12.173960
Event: 1994 North American Conference on Smart Structures and Materials, 1994, Orlando, FL, United States

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.

Citation Download Citation

Michael F. Gunther, Kent A. Murphy, Richard O. Claus, and Tuan A. Tran "Plastic deformation analysis in metal using absolute optical fiber strain sensor", Proc. SPIE 2191, Smart Structures and Materials 1994: Smart Sensing, Processing, and Instrumentation, (1 May 1994); https://doi.org/10.1117/12.173960

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