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Proceedings Paper

High-performance fiber optic systems for damage detection and structural health monitoring
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Paper Abstract

This paper describes two systems that can monitor up to 64 fiber Bragg grating (FBG) strain gauges simultaneously and their use in structural health monitoring applications. One system directly tracks wavelength shifts and provides ~0.3 me sensitivity with data rates to 360 Hz. The second system uses an unbalanced Mach-Zehnder interferometer to convert wavelength to phase. It has a noise floor of ~5 ne/Hz1/2 and data rates to 10 kHz. The wavelength-based system was used in field tests on an all composite hull surface effects ship in the North Sea and on an Interstate highway bridge in New Mexico. The interferometric system has been used to demonstrate enhanced damage detection sensitivity in a series of laboratory experiments that rely on a novel data analysis approach based in nonlinear dynamics and state space analysis. The sensitivity of three of these novel damage detection methods is described.

Paper Details

Date Published: 8 December 2004
PDF: 10 pages
Proc. SPIE 5590, Sensors for Harsh Environments, (8 December 2004); doi: 10.1117/12.580335
Show Author Affiliations
Mark E. Seaver, Naval Research Lab. (United States)
Stephen T. Trickey, Naval Research Lab. (United States)
Jonathan M. Nichols, Naval Research Lab. (United States)
Linda Moniz, Naval Research Lab. (United States)
Lou Pecora, Naval Research Lab. (United States)
Michael D. Todd, Univ. of California/San Diego (United States)

Published in SPIE Proceedings Vol. 5590:
Sensors for Harsh Environments
Anbo Wang, Editor(s)

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