8 December 2004 High-performance fiber optic systems for damage detection and structural health monitoring
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Proceedings Volume 5590, Sensors for Harsh Environments; (2004) https://doi.org/10.1117/12.580335
Event: Optics East, 2004, Philadelphia, Pennsylvania, United States
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.
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Mark E. Seaver, Mark E. Seaver, Stephen T. Trickey, Stephen T. Trickey, Jonathan M. Nichols, Jonathan M. Nichols, Linda Moniz, Linda Moniz, Lou Pecora, Lou Pecora, Michael D. Todd, Michael D. Todd, } "High-performance fiber optic systems for damage detection and structural health monitoring", Proc. SPIE 5590, Sensors for Harsh Environments, (8 December 2004); doi: 10.1117/12.580335; https://doi.org/10.1117/12.580335
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