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Sensors 2017, 17(11), 2696; doi:10.3390/s17112696

An Optical Interferometric Triaxial Displacement Sensor for Structural Health Monitoring: Characterization of Sliding and Debonding for a Delamination Process

1
Department of Electrical and Computer Engineering, Missouri University of Science and Technology, Rolla, MO 65409, USA
2
American Inventor Institute, Willow Spring, IL 60480, USA
The first two authors should be regarded as joint first authors.
*
Author to whom correspondence should be addressed.
Received: 30 October 2017 / Revised: 12 November 2017 / Accepted: 21 November 2017 / Published: 22 November 2017
(This article belongs to the Section Physical Sensors)
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Abstract

This paper presents an extrinsic Fabry–Perot interferometer-based optical fiber sensor (EFPI) for measuring three-dimensional (3D) displacements, including interfacial sliding and debonding during delamination. The idea employs three spatially arranged EFPIs as the sensing elements. In our sensor, the three EFPIs are formed by three endfaces of three optical fibers and their corresponding inclined mirrors. Two coincident roof-like metallic structures are used to support the three fibers and the three mirrors, respectively. Our sensor was calibrated and then used to monitor interfacial sliding and debonding between a long square brick of mortar and its support structure (i.e., a steel base plate) during the drying/curing process. This robust and easy-to-manufacture triaxial EFPI-based 3D displacement sensor has great potential in structural health monitoring, the construction industry, oil well monitoring, and geotechnology. View Full-Text
Keywords: three-dimensional displacement; extrinsic Fabry–Perot interferometer; interfacial sliding; debonding; structural health monitoring three-dimensional displacement; extrinsic Fabry–Perot interferometer; interfacial sliding; debonding; structural health monitoring
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MDPI and ACS Style

Zhu, C.; Chen, Y.; Zhuang, Y.; Du, Y.; Gerald, R.E., II; Tang, Y.; Huang, J. An Optical Interferometric Triaxial Displacement Sensor for Structural Health Monitoring: Characterization of Sliding and Debonding for a Delamination Process. Sensors 2017, 17, 2696.

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