Title:
Crack detection using a passive wireless strain sensor

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dc.contributor.advisor Wang, Yang
dc.contributor.advisor Leon, Roberto T.
dc.contributor.author Lantz, Gabriel Antoine en_US
dc.contributor.committeeMember Manos M. Tentzeris
dc.contributor.department Civil and Environmental Engineering en_US
dc.date.accessioned 2013-01-17T21:00:27Z
dc.date.available 2013-01-17T21:00:27Z
dc.date.issued 2011-08-29 en_US
dc.description.abstract Nearly one third of the 604,426 bridges in the United-States are either structurally deficient or functionally obsolete. Monitoring these bridges is essential to avoid catastrophic accidents. In steel bridges fatigue induced crack/rupture, which is one of the most common modes of failure, can be avoided if the crack is detected at the early stages of its formation. Cracks usually originate at stress concentration areas but their precise origin is random. Such strain concentration can be monitored with traditional strain gages, but their installation requires lengthy wires and equipment, which are expensive and labor intensive. Therefore wireless sensors are being developed to cope with these problems. In this work, a passive wireless strain sensor based on RFID technology is described. The sensor is a patch antenna that resonates at a certain frequency, which shifts in presence of strain. The relation between the resonance frequency and the strain is approximately linear. The slope of the relation is called sensitivity. The behavior of the sensor's sensitivity is studied using experimental work and simulations that couple electromagnetism and mechanics. The sensitivity measured in experiments and in simulations in presence of uniform strain is different. This difference is lower for the sensitivity in presence of a crack, probably due to a parameter variation that is currently not accurately modeled in the simulations. en_US
dc.description.degree MS en_US
dc.identifier.uri http://hdl.handle.net/1853/45773
dc.publisher Georgia Institute of Technology en_US
dc.subject Sensor en_US
dc.subject RFID en_US
dc.subject Strain en_US
dc.subject Structure en_US
dc.subject.lcsh Strains and stresses
dc.subject.lcsh Structural analysis (Engineering)
dc.subject.lcsh Structural health monitoring
dc.subject.lcsh Radio frequency identification systems
dc.title Crack detection using a passive wireless strain sensor en_US
dc.type Text
dc.type.genre Thesis
dspace.entity.type Publication
local.contributor.advisor Wang, Yang
local.contributor.corporatename School of Civil and Environmental Engineering
local.contributor.corporatename College of Engineering
relation.isAdvisorOfPublication 9390b967-a83c-439f-ad83-7d51862258e7
relation.isOrgUnitOfPublication 88639fad-d3ae-4867-9e7a-7c9e6d2ecc7c
relation.isOrgUnitOfPublication 7c022d60-21d5-497c-b552-95e489a06569
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