Time domain reflectometry (TDR) techniques for the design of distributed sensors

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dc.contributor.authorStastny, Jeffrey Allenen
dc.contributor.departmentMechanical Engineeringen
dc.date.accessioned2014-03-14T21:45:48Zen
dc.date.adate2009-09-12en
dc.date.available2014-03-14T21:45:48Zen
dc.date.issued1992en
dc.date.rdate2009-09-12en
dc.date.sdate2009-09-12en
dc.description.abstractParametric design models were created to optimize cable sensitivities in a structural health-monitoring system. Experiments were also conducted to determine the sensitivity of a working system. The system consists of time domain reflectometry (TDR) signal processing equipment and specially designed sensing cables. The TDR equipment sends a high-frequency electric pulse (in the gigahertz range) along the sensing cable. Any change in electric impedance along the cable reflects some portion of the electric pulse back to the TDR equipment. The time delay, amplitude, and shape of the reflected pulse provides the means to respectively locate, determine the magnitude, and indicate the nature of the change in impedance. The change in the sensing cable impedance may be caused by cable elongation (change in resistance), shear deformation (change in capacitance), corrosion of the cable or the materials around the cable (change in inductance), etc. The sensing cables are an essential part of the health-monitoring system because the cable design parameters determine the cable impedance sensitivity to structural changes. By using parametric design models, the optimum cable parameters can be determined for specific cases and used to select or design an appropriate cable. Proof-of-concept and resolution experiments were also conducted to provide, respectively, verification and sensitivity of the system.en
dc.description.degreeMaster of Scienceen
dc.format.extentxv, 109 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-09122009-040407en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-09122009-040407/en
dc.identifier.urihttp://hdl.handle.net/10919/44753en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1992.S732.pdfen
dc.relation.isformatofOCLC# 27568356en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1992.S732en
dc.subject.lcshBiosensorsen
dc.subject.lcshReflectometeren
dc.subject.lcshTime-domain analysisen
dc.titleTime domain reflectometry (TDR) techniques for the design of distributed sensorsen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineMechanical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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