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Proceedings Paper

Cantilever plate deformation monitoring using wavelength division multiplexed fiber Bragg grating sensors
Author(s): R. T. Jones; Timothy A. Berkoff; David G. Bellemore; D. A. Early; James S. Sirkis; Martin A. Putnam; E. Joseph Friebele; Alan D. Kersey
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Paper Abstract

An algorithm has been developed to determine deformations of a cantilever honeycomb plate under arbitrary loading conditions. The algorithm utilizes strain information from a set of sixteen fiber Bragg grating sensors, mounted on the plate so that all sensors measure strains along the clamped-free direction. The sensors are interrogated using a wavelength-division multiplexing scheme. A two-dimensional bi-polynomial function which represents the strain field is created using a least-squares algorithm. This function is integrated twice with the known boundary conditions applied to yield the deformation field for the plate. Maximum differences between finite-element solutions and least-squares estimates did not exceed 29.0 percent for any of the 16 investigated load scenarios. However, when considering areas of maximum deflection, the least-squares estimates did not exceed 13.3 percent difference. The algorithms used to interrogate the sensors, perform the strain-displacement calculations, and generate a real-time (approximately 4 Hz) mesh of displacement are encoded in a C program.

Paper Details

Date Published: 30 May 1996
PDF: 11 pages
Proc. SPIE 2718, Smart Structures and Materials 1996: Smart Sensing, Processing, and Instrumentation, (30 May 1996); doi: 10.1117/12.240899
Show Author Affiliations
R. T. Jones, Naval Research Lab. (United States)
Timothy A. Berkoff, Naval Research Lab. (United States)
David G. Bellemore, Naval Research Lab. (United States)
D. A. Early, Naval Research Lab. (United States)
James S. Sirkis, Univ. of Maryland/College Park (United States)
Martin A. Putnam, Naval Research Lab. (United States)
E. Joseph Friebele, Naval Research Lab. (United States)
Alan D. Kersey, Naval Research Lab. (United States)


Published in SPIE Proceedings Vol. 2718:
Smart Structures and Materials 1996: Smart Sensing, Processing, and Instrumentation
Kent A. Murphy; Dryver R. Huston, Editor(s)

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