Digital frequency demodulation for a laser vibrometer

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dc.contributor.authorCronin, Christopher Josephen
dc.contributor.committeecochairWicks, Alfred L.en
dc.contributor.committeecochairAbbott, A. Lynnen
dc.contributor.committeememberWest, Robert L. Jr.en
dc.contributor.departmentElectrical Engineeringen
dc.date.accessioned2014-03-14T21:49:30Zen
dc.date.adate2009-11-10en
dc.date.available2014-03-14T21:49:30Zen
dc.date.issued1994en
dc.date.rdate2009-11-10en
dc.date.sdate2009-11-10en
dc.description.abstractThis thesis presents the design and simulation of a digital frequency demodulator applied to a Michelson interferometer-based scanning laser vibrometer. The laser vibrometer is a velocity transducer that produces frequency-modulated signals that have traditionally been optically or electronically frequency shifted from baseband to an intermediate frequency. This shifting produces a narrow band modulation that may be demodulated with standard analog frequency demodulators. This thesis proposes replacing these traditional optics or electronic circuits with a digital frequency demodulator. The optics of a laser vibrometer can be constructed such that a near-perfect baseband quadrature representation is available for the frequency modulation. It will be seen that this representation is well suited for use by a digital frequency demodulator. This thesis applies the arctangent-type digital frequency demodulator to a laser vibrometer and demonstrates its superiority over other digital demodulation techniques. In addition some specialized signal processing to handle the special case of sine-dwell vibration tests is presented.en
dc.description.degreeMaster of Scienceen
dc.format.extentvi, 76 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-11102009-020344en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-11102009-020344/en
dc.identifier.urihttp://hdl.handle.net/10919/45633en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1994.C766.pdfen
dc.relation.isformatofOCLC# 30830803en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1994.C766en
dc.subject.lcshFrequency modulation detectorsen
dc.subject.lcshLaser interferometersen
dc.subject.lcshVibration -- Measurementen
dc.titleDigital frequency demodulation for a laser vibrometeren
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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