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# Tactile Sensor Based on Piezoelectric Resonance

Krishna, Murali G and Rajanna, K (2002) Tactile Sensor Based on Piezoelectric Resonance. In: IEEE Sensors, 2002, 12-14 June, Florida,USA, Vol.2, 1643 -1647.

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## Abstract

We discuss the realization of tactile sensor based on the principle of change in piezoelectric resonance frequency with applied pressure. An array of electrodes has been adopted on either side of the PZT material to achieve independent resonators. The common areas sandwiched between the electrodes and excitable at the resonance frequency of the PZT material are used to form the sensitive area of the tactile sensor. The electrodes were deposited using a sputtering technique. Tactile sensors with $3\times3$, $7\times7$ and $15\times15$ array of electrodes are developed with different electrode dimensions and separation between the electrodes. The tactile sensor has been interfaced to a computer for the convenience of automatic scanning and making it more user interactive. The tactile sensors developed with different spatial resolution were tested for different shaped objects placed in contact with the sensor. The $3\times3$ matrix tactile sensor showed relatively poor spatial resolution whereas $15\times15$-matrix tactile sensor showed improved spatial resolution. The sensor with $7\times7$ matrix elements was tested for its sensitivity to different extents of applied force/pressure. The output response study carried out on the sensors indicated that these sensors can provide information not only about the extent of force/pressure applied on the object, but also the contour of the object which is in contact with the sensor.

Item Type: Conference Paper Copyright 1990 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. Tactile sensor;Piezoelectric Resonance and Robotics Division of Physical & Mathematical Sciences > Instrumentation Appiled Physics HS Usha 31 Jan 2006 19 Sep 2010 04:23 http://eprints.iisc.ac.in/id/eprint/5249

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