Vol. 121, Issue 10, October 2010, pp.121-132

IDC Based Battery-free Wireless Pressure Sensor

Jose G. Villalobos, Zhen Xu, and Yi Jia

Department of Mechanical Engineering, University of Puerto Rico Mayaguez Campus

Mayaguez, PR 00680

Tel.: 787-832-4040 ext 3482, fax: 787-265-3817

E-mail: jia0@me.uprm.edu

Received: 3 September 2010   /Accepted: 18 October 2010   /Published: 26 October 2010

Abstract: n this paper a battery-free wireless pressure sensor is presented with design of two major parts: a interdigital capacitor (IDC) 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 in conventional pressure sensor. 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 of the sensitive layer. The sensor prototype has been made and experiment demonstrated that the sensor prototype performs well in a range of 0 psi to 60 psi with an average pressure sensitivity of 25 kHz/psi.

Keywords: Battery-free and wireless, Pressure sensor, Interdigital capacitor

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