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dc.contributor.authorWestafer, Ryan S.en_US
dc.date.accessioned2011-09-22T17:50:40Z
dc.date.available2011-09-22T17:50:40Z
dc.date.issued2011-07-01en_US
dc.identifier.urihttp://hdl.handle.net/1853/41165
dc.description.abstractThe object of this research was to investigate dispersion in surface phononic crystals (PnCs) for application to a newly developed passive surface acoustic wave (SAW) ozone sensor. Frequency band gaps and slow sound already have been reported for PnC lattice structures. Such engineered structures are often advertised to reduce loss, increase sensitivity, and reduce device size. However, these advances have not yet been realized in the context of surface acoustic wave sensors. In early work, we computed SAW dispersion in patterned surface structures and we confirmed that our finite element computations of SAW dispersion in thin films and in one dimensional surface PnC structures agree with experimental results obtained by laser probe techniques. We analyzed the computations to guide device design in terms of sensitivity and joint spectral operating point. Next we conducted simulations and experiments to determine sensitivity and limit of detection for more conventional dispersive SAW devices and PnC sensors. Finally, we conducted extensive ozone detection trials on passive reflection mode SAW devices, using distinct components of the time dispersed response to compensate for the effect of temperature. The experimental work revealed that the devices may be used for dosimetry applications over periods of several days.en_US
dc.publisherGeorgia Institute of Technologyen_US
dc.subjectRFIDen_US
dc.subjectUHFen_US
dc.subjectDuration bandwidth producten_US
dc.subjectDosimetryen_US
dc.subjectSAWen_US
dc.subjectPnCen_US
dc.subjectFEMen_US
dc.subjectDispersionen_US
dc.subjectPolybutadieneen_US
dc.subjectLithium niobateen_US
dc.subjectVirtual measurementen_US
dc.subject.lcshPhonons
dc.subject.lcshCrystal lattices
dc.subject.lcshAcoustic surface wave devices
dc.subject.lcshAtmospheric ozone
dc.subject.lcshDetectors
dc.titleInvestigation of phononic crystals for dispersive surface acoustic wave ozone sensorsen_US
dc.typeDissertationen_US
dc.description.degreePh.D.en_US
dc.contributor.departmentElectrical and Computer Engineeringen_US
dc.description.advisorCommittee Chair: Hunt, William D.; Committee Member: Bergin, Michael H.; Committee Member: Durgin, Gregory D.; Committee Member: Kenney, J. Stevenson; Committee Member: Michaels, Thomas E.en_US


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