Cantilever plate deformation monitoring using wavelength division multiplexed fiber Bragg grating sensors

R. T. Jones; Timothy A. Berkoff; David G. Bellemore; D. A. Early; James S. Sirkis; Martin A. Putnam; E. Joseph Friebele; Alan D. Kersey

doi:10.1117/12.240899

30 May 1996 Cantilever-plate-deformation monitoring using wavelength-division multiplexed fiber Bragg grating sensors

R. T. Jones, Timothy A. Berkoff, David G. Bellemore, D. A. Early, James S. Sirkis, Martin A. Putnam, E. Joseph Friebele, Alan D. Kersey

Author Affiliations +

Proceedings Volume 2718, Smart Structures and Materials 1996: Smart Sensing, Processing, and Instrumentation; (1996) https://doi.org/10.1117/12.240899
Event: 1996 Symposium on Smart Structures and Materials, 1996, San Diego, CA, United States

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.

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R. T. Jones, Timothy A. Berkoff, David G. Bellemore, D. A. Early, James S. Sirkis, Martin A. Putnam, E. Joseph Friebele, and Alan D. Kersey "Cantilever-plate-deformation monitoring using wavelength-division multiplexed fiber Bragg grating sensors", Proc. SPIE 2718, Smart Structures and Materials 1996: Smart Sensing, Processing, and Instrumentation, (30 May 1996); https://doi.org/10.1117/12.240899

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