Piezoelectric energy harvesting using blood-flow-like excitation for implantable devices

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dc.check.embargoformatNot applicableen
dc.check.infoNo embargo requireden
dc.check.opt-outNoen
dc.check.reasonNo embargo requireden
dc.check.typeNo Embargo Required
dc.contributor.advisorMcCarthy, Kevin G.en
dc.contributor.advisorMathewson, Alanen
dc.contributor.authorO'Keeffe, Rosemary
dc.contributor.funderEnterprise Irelanden
dc.contributor.funderIDA Irelanden
dc.contributor.funderInternational Centre for Graduate Education in Micro and Nano Engineeringen
dc.date.accessioned2016-04-28T10:25:29Z
dc.date.available2016-04-28T10:25:29Z
dc.date.issued2015
dc.date.submitted2015
dc.description.abstractThe goal of this research is to produce a system for powering medical implants to increase the lifetime of the implanted devices and reduce the battery size. The system consists of a number of elements – the piezoelectric material for generating power, the device design, the circuit for rectification and energy storage. The piezoelectric material is analysed and a process for producing a repeatable high quality piezoelectric material is described. A full width half maximum (FWHM) of the rocking curve X-Ray diffraction (XRD) scan of between ~1.5° to ~1.7° for test wafers was achieved. This is state of the art for AlN on silicon and means devices with good piezoelectric constants can be fabricated. Finite element modelling FEM) was used to design the structures for energy harvesting. The models developed in this work were established to have an accuracy better than 5% in terms of the difference between measured and modelled results. Devices made from this material were analysed for power harvesting ability as well as the effect that they have on the flow of liquid which is an important consideration for implantable devices. The FEM results are compared to experimental results from laser Doppler vibrometry (LDV), magnetic shaker and perfusion machine tests. The rectifying circuitry for the energy harvester was also investigated. The final solution uses multiple devices to provide the power to augment the battery and so this was a key feature to be considered. Many circuits were examined and a solution based on a fully autonomous circuit was advanced. This circuit was analysed for use with multiple low power inputs similar to the results from previous investigations into the energy harvesting devices. Polymer materials were also studied for use as a substitute for the piezoelectric material as well as the substrate because silicon is more brittle.en
dc.description.statusNot peer revieweden
dc.description.versionAccepted Version
dc.format.mimetypeapplication/pdfen
dc.identifier.citationO'Keeffe, R. 2015. Piezoelectric energy harvesting using blood-flow-like excitation for implantable devices. PhD Thesis, University College Cork.en
dc.identifier.endpage207en
dc.identifier.urihttps://hdl.handle.net/10468/2490
dc.language.isoenen
dc.publisherUniversity College Corken
dc.rights© 2015, Rosemary O'Keeffe.en
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/en
dc.subjectPiezoelectricen
dc.subjectMaterialsen
dc.subjectFEMen
dc.subjectAluminium nitrideen
dc.subjectEnergy harvestingen
dc.thesis.opt-outfalse
dc.titlePiezoelectric energy harvesting using blood-flow-like excitation for implantable devicesen
dc.typeDoctoral thesisen
dc.type.qualificationlevelDoctoralen
dc.type.qualificationnamePHD (Engineering)en
ucc.workflow.supervisork.mccarthy@ucc.ie
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