Resonances and nonuniformities in CMUT elements or arrays

buir.contributor.authorAtalar, Abdullah
buir.contributor.authorKöymen, Hayrettin
buir.contributor.orcidAtalar, Abdullah|0000-0002-1903-1240
dc.citation.epage300en_US
dc.citation.spage297en_US
dc.contributor.authorAtalar, Abdullahen_US
dc.contributor.authorKöymen, Hayrettinen_US
dc.coverage.spatialChicago, IL, USA
dc.date.accessioned2016-02-08T12:03:09Z
dc.date.available2016-02-08T12:03:09Z
dc.date.issued2014-09en_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.descriptionDate of Conference: 3-6 Sept. 2014
dc.descriptionConference name: 2014 IEEE International Ultrasonics Symposium
dc.description.abstractWe determine the response of individual cells of a CMUT array immersed in water using the small-signal equivalent circuit of a single cell and radiation impedances. Using a numerically efficient technique, we are able to simulate large arrays. The results indicate the presence of resonances at low frequencies where Rayleigh-Bloch waves are excited on the surface of the array. Reflections from the edges cause standing-wave patterns. Above the cut-off frequency of Rayleigh-Bloch waves, no standing-wave pattern exists. However, there is nonuniformity among cell velocities mainly due to unequal radiation impedance seen by the cells. Rayleigh-Bloch waves and nonuniformity in cell velocities do not cause a significant degradation in the point spread function, but the oscillations extend the duration of impulse response, limiting the dynamic range. © 2014 IEEE.en_US
dc.description.provenanceMade available in DSpace on 2016-02-08T12:03:09Z (GMT). No. of bitstreams: 1 bilkent-research-paper.pdf: 70227 bytes, checksum: 26e812c6f5156f83f0e77b261a471b5a (MD5) Previous issue date: 2014en
dc.identifier.doi10.1109/ULTSYM.2014.0073en_US
dc.identifier.urihttp://hdl.handle.net/11693/27857
dc.language.isoEnglishen_US
dc.publisherIEEEen_US
dc.relation.isversionofhttp://dx.doi.org/10.1109/ULTSYM.2014.0073en_US
dc.source.title2014 IEEE International Ultrasonics Symposium, IUSen_US
dc.subjectCellsen_US
dc.subjectElastic wavesen_US
dc.subjectHeterojunction bipolar transistorsen_US
dc.subjectImpulse responseen_US
dc.subjectOptical transfer functionen_US
dc.subjectDynamic rangeen_US
dc.subjectIndividual cellsen_US
dc.subjectLarge arraysen_US
dc.subjectNon-uniformitiesen_US
dc.subjectNonuniformityen_US
dc.subjectRadiation impedanceen_US
dc.subjectSmall signal equivalent circuiten_US
dc.subjectStanding wave patternsen_US
dc.subjectCytologyen_US
dc.titleResonances and nonuniformities in CMUT elements or arraysen_US
dc.typeConference Paperen_US

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