Villalobos Jiménez, José G.

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    Battery-free wireless pressure sensor
    (2010-12) Villalobos Jiménez, José G.; Jia, Yi; College of Engineering; Serrano, David; Just Agosto, Frederick A.; Department of Mechanical Engineering; Padrón Corbera, Mario
    In 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.