Fiber optic methods for nondestructive testing

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dc.contributor.authorRudraraju, Sridharen
dc.contributor.departmentElectrical Engineeringen
dc.date.accessioned2014-03-14T21:26:54Zen
dc.date.adate2009-01-10en
dc.date.available2014-03-14T21:26:54Zen
dc.date.issued1994en
dc.date.rdate2009-01-10en
dc.date.sdate2009-01-10en
dc.description.abstractThis thesis demonstrates the use of fiber optic methods for nondestructive testing of composite materials and aluminum specimens using the acousto-ultrasound approach. A noncontact method using a hybrid interferometer is devised for measuring absolute surface acoustic wave (SAW) amplitudes. The J1..J4 spectrum analysis technique is used for calibrating the piezoelectric transducer cylinder (PZT) and JO/J2 spectrum analysis technique is used for demodulating the SAW signal from the interferometer. An extrinsic Fabry-Perot interferometric (EFPI) sensor is utilized for sensing acoustic emission, measuring speed and attenuation in aluminum and composite specimens. A broadband preamplifier is designed for amplifying signals from the EFPI sensor. Theoretical and practical minimum detectable air gap change of an EFPI sensor are calculated for the system. The directional sensitivity of the EFPI sensor to SAW is studied.en
dc.description.degreeMaster of Scienceen
dc.format.extentvi, 61 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-01102009-063839en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-01102009-063839/en
dc.identifier.urihttp://hdl.handle.net/10919/40577en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1994.R837.pdfen
dc.relation.isformatofOCLC# 31467654en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1994.R837en
dc.subject.lcshComposite materials -- Testingen
dc.subject.lcshFiber opticsen
dc.subject.lcshInterferometersen
dc.subject.lcshNondestructive testingen
dc.titleFiber optic methods for nondestructive testingen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineElectrical Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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