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dc.contributor.advisorJia, Yi
dc.contributor.authorVillalobos-Jiménez, José G.
dc.description.abstractIn this project two differents battery-free wireless pressure sensors have been developed with the same structure with two major parts: a capacitor that serves as a pressure sensing element and an inductor which works as a passive power source and data communication element. These two components work together as an LC resonator to realize the wireless pressure sensing and remote power to eliminate the need for wire connection. The first pressure sensor has a laminated structure with an interdigital capacitor (IDC) that is a sensing element and an inductor coil as antenna, the sensing element is comprised of a set of linear parallel electrodes coated with Polyvinylidene Fluoride (PVDF) pressure sensing material on the top. The change of capacitance in the IDC is a function of the geometry of the electrodes and the electric properties the sensitive layer. The sensing element for the second pressure sensor is a parallel plate which the change the capacitance is due the deformation of the dielectric material between the conductive parallel plates; for this pressure sensor design two kind of polymeric materials (liquid rubber of polyurethane and PolydimethyIsiloxane) have been used and it; these materials must be soft enough to deform over a target pressure. The inductor coil was formed by winding an insulated wire. The inductor coil was formed by winding an insulated wire. The interdigital protoype shows an experimental response to measure a range of pressure from 0 psi to 60 psi with an average sensitivity of 25KHz/psi and the parallel plates were designed to measure a range of pressure from 0 psi to 48 psi with an average sensitivity of 33.3 KHz/psi and 66.6 KHz/psi for PDMS and Polyurethane, respectively.
dc.description.abstractEn este proyecto seran propuestos dos diferentes sensores pasivos inalambricos de presion los cuales tienen la misma estructura con dos partes principales: un capacitor que sirve como elemento sensante de presin y un inductor que trabaja como fuente pasiva de poder y elemento de transmision de datos. Estos dos componentes trabajan juntos como un circuito resonador LC para realizar la medicion inalambrica de la presion, eliminando la necesidad de de conexion por cables. EL primer sensor tiene una estructura laminada con un capacitor interdigital (IDC) que es el elemento sensante y un inductor en forma de bobina, el elemento sensante esta compuesto por un juego electrodos lineales y paralelos cubiertos con Polyvinylidene Fluoride (PVDF) en la parte superior. El cambio de capacitancia en el capacitor interdigital es una funcin de la geometra de los electrodos y las propiedades elctricas del material sensitivo encima de los electrodos. El elemento sensante para el segundo sensor propuesto son unas placas paralelas las cuales el cambio de capacitancia es debido a la deformacion de material dielectrico entre las placas paralelas conductoras. Para este diseo de este sensor de presin dos clases de materiales polimricos (Poliuretano y PolydimethyIsiloxane) han sido utilizados; estos materiales deben ser lo suficientemente suaves para que se puedan deformar bajo una presin especifica.EL inductor est formado por un bobina con un cable aislado. El prototipo interdigital muestra un respuesta experimental para medir un rango de presin de 0psi a 60 psi con una sensitividad promedio de 25KHz/psi y los prototipos de placas paralelas fueron mostraron una respuesta experimental para medir un rango de presin entre 0 psi a 48 psi con una sensitividad promedio de 33.3Khz/psi y 66.6Khz/psi para el PolydimethyIsiloxane y poliuretano respectivamente.
dc.description.sponsorshipNational Science Foundation Grant 0549338 and DE-FG26-07NT43061en_US
dc.subjectwireless pressure sensoren_US
dc.subject.lcshPressure transducersen_US
dc.subject.lcshElectric inductorsen_US
dc.subject.lcshWireless sensor networksen_US
dc.titleBattery-free wireless pressure sensoren_US
dc.rights.licenseAll rights reserveden_US
dc.rights.holder(c) 2010 José Gregorio Villalobos Jiménezen_US
dc.contributor.committeeSerrano, David
dc.contributor.committeeJust Agosto, Frederick A.
dc.contributor.representativePadron Corbera, Mario Engineeringen_US
dc.contributor.collegeCollege of Engineeringen_US
dc.contributor.departmentDepartment of Mechanical Engineeringen_US

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    Items included under this collection are theses, dissertations, and project reports submitted as a requirement for completing a graduate degree at UPR-Mayagüez.

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