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.
C. Zhu et al., "An Optical Interferometric Triaxial Displacement Sensor for Structural Health Monitoring: Characterization of Sliding and Debonding for a Delamination Process," Sensors, vol. 17, no. 11, MDPI AG, Nov 2017.
The definitive version is available at https://doi.org/10.3390/s17112696
Electrical and Computer Engineering
University of Missouri Research Board
Missouri University of Science and Technology. Materials Research Center
Keywords and Phrases
Construction industry; Debonding; Delamination; Interferometers; Mirrors; Oil wells; Optical fibers, 3-D displacement; Displacement sensor; Interfacial sliding; Metallic structures; Sensing elements; Support structures; Three-dimensional displacements; Threedimensional (3-d), Structural health monitoring; Extrinsic Fabry-Perot interferometer
International Standard Serial Number (ISSN)
Article - Journal
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01 Nov 2017