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dc.contributor.advisorJuan-García, Eduardo J.
dc.contributor.authorNaranjo-Bueno, Maria Fernanda
dc.date.accessioned2019-05-15T17:59:33Z
dc.date.available2019-05-15T17:59:33Z
dc.date.issued2007
dc.identifier.urihttps://hdl.handle.net/20.500.11801/2368
dc.description.abstractNine polyvinylidene fluoride (PVDF) membrane transducers were developed to be used as receivers and transmitters in underwater applications, such as in acoustic reflectometry. The design requirements were oriented to comply with a bandwidth of 10 to 160 kHz, minimize the transducer size and generate construction techniques that will allow future researchers to modify the transducers and adapt them to different geometries. They represent a novel concept because of their working frequency range and their physical construction, easily shaped to customized applications. The nine transducers were created through the combination of three different PVDF film thicknesses (28, 52 and 110 μm) and three circular active areas (with radius 2, 3 and 4 mm). The receiving and transmitting sensitivities were studied through computer simulations and experimental tests, with respect to three main parameters: frequency, active area and film thickness. The receiving sensitivity increased as function of active area, and did not reveal any clear trend with respect to thickness or frequency. The transmitting sensitivity increased its magnitude with increasing frequency or the active area, but did not depend considerably on thickness. The final construction technique selected was to attach the PVDF film to a pre-engraved conductive base, with a case molded with an epoxy material. It offers the most advantages because the electrodes connection does not affect the piezofilm physical properties and the case can be easily shaped.en_US
dc.description.abstractNueve transductores de membrana de polifluoruro de vinilideno (PVDF) fueron desarrollados para ser usados como receptores y transmisores en aplicaciones bajo el agua, tales como reflectometría acústica. Los requerimientos de diseño fueron orientados a satisfacer un ancho de banda de 10 a 160 kHz, minimizar el tamaño del transductor y generar técnicas de construcción que permitan a futuros investigadores modificar los transductores y adaptarlos a diferentes geometrías. Estos representan un concepto novedoso debido a su rango de frecuencia y su construcción física, fácilmente moldeable para aplicaciones personalizadas. Los nueve transductores fueron creados a través de la combinación de tres diferentes espesores de PVDF (28, 52 y 110 μm), y tres áreas activas circulares (con radios 2, 3 y 4 mm). Las sensitividades de recepción y transmisión fueron estudiadas a través de simulaciones computarizadas y pruebas experimentales, con respecto a tres parámetros: frecuencia, área activa y espesor de la lámina piezoeléctrica. La sensitividad de recepción aumentó como función del área activa, y no reveló una clara tendencia con respecto al espesor de la membrana o la frecuencia. La sensitividad de transmisión aumentó su magnitud al aumentar la frecuencia o el área activa, pero no dependió considerablemente del espesor. La técnica de construcción final seleccionada consistió en adherir el film de PVDF a una base conductiva pre-grabada, con un empaque moldeado en un material epóxico. Este ofrece las mayores ventajas ya que la conexión de los electrodos no afecta las propiedades físicas del piezofilm y el revestimiento puede ser fácilmente moldeado.en_US
dc.description.sponsorshipSupported by the National Institute of Health NIH, MBRS-SCORE program.en_US
dc.language.isoEnglishen_US
dc.titleDesign of pvdf transducers for acoustic reflectometry applicationsen_US
dc.typeThesisen_US
dc.rights.licenseAll rights reserveden_US
dc.rights.holder(c) 2007 Maria Fernanda Naranjo-Buenoen_US
dc.contributor.committeeVélez-Rivera, Bienvenido
dc.contributor.committeeRodríguez-Solís, Rafael
dc.contributor.representativeValentín, Ricky
thesis.degree.levelM.S.en_US
thesis.degree.disciplineElectrical Engineeringen_US
dc.contributor.collegeCollege of Engineeringen_US
dc.contributor.departmentDepartment of Electrical and Computer Engineeringen_US
dc.description.graduationYear2007en_US


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