Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/20809
Title: Dynamic strain sensing in a long-span suspension bridge using fiber Bragg grating sensors
Authors: Zhu, Y
Zhu, YJ
Balogun, O
Zhu, S 
Xu, YL 
Krishnaswamy, S
Keywords: Acoustic Emission
Fiber bragg gratings
Optical fiber sensors
Structural health monitoring
Issue Date: 2011
Source: AIP Conference Proceedings, 2011, v. 1335, p. 1418-1423 How to cite?
Journal: AIP Conference Proceedings 
Abstract: Optical fiber sensors are ideal for monitoring continuous deterioration conditions of civil infrastructure, especially of long-span bridges. Typically, a network of sensors is used to measure the strains or low frequency vibrational response of the structure. In this work, we demonstrate dynamic spectral demodulation of fiber Bragg grating (FBG) sensor responses with a stabilized Michelson interferometer for monitoring mechanical strains in a model of long-span bridge. A series of experiments has been performed, including the measurements of the natural resonant modes of the model bridge, impact response of a bridge member and acoustic emissions in a fractured aluminum bar. The experimental results not only reveal that dynamic spectral demodulation of FBG strain responses at frequencies extending up to about 3.5 MHz is possible, but also suggest that the method may be suitable for monitoring high frequency mechanical strains in civil structures that result from cracking or impact loading, thus providing a tool for local detection of structural damage.
Description: 37th Annual Review of Progress in Quantitative Nondestructive Evaluation, QNDE, San Diego, CA, 18-23 July 2010
URI: http://hdl.handle.net/10397/20809
ISBN: 9780735408883
ISSN: 0094-243X
DOI: 10.1063/1.3592098
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