Ms. Suzhen Li Profile

Suzhen Li

at Ibaraki Univ

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Proceedings Article | 17 May 2005 Paper

Characterization of long-gauge fiber optic sensors for structural identification

Suzhen Li, Zhishen Wu

Proceedings Volume 5765, (2005) https://doi.org/10.1117/12.606367

KEYWORDS: Sensors, Fiber Bragg gratings, Fiber optics sensors, Packaging, Chemical elements, Composites, Single mode fibers, Connectors, Epoxies, Earthquakes

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To monitor structural behavior of large-scale civil infrastructures such as long-span bridges, it requires direct and accurate measurement of "macroscopic" strains which are more representative of the deformation of entire structural element. On the other hand, quasi-distributed measurements are also supposed to serve the purpose to catch the characters of whole structure. In this regard, a novel packaging method for practical adaptation of long-gage FBG strain sensor in civil structures is proposed. After a series of tests including uniaxial tension and compression, bending, free-vibration and shaking table tests, the ability of the packaged FBG sensors fixed on different specimen for macro-strain measurements has been characterized by comparing with conventional foil strain gauges in both static and dynamic cases. Combined with the parametric identification method based on macro-stains, the applicability of quasi-distributed long-gage FBG sensors in structural parameter estimation and damage detection is discussed.

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