Surface Acoustic Wave (SAW)

Sensor Materials Glass, piezoelectric transducers

Principle of Operation

•Piezoelectric transmitters on the sensor generate acoustic waves on the surface of the glass substrate on alternating X-axis and Y-axis patterns. •The acoustic waves are reflected by a pattern of edge ridges directing the energy to piezoelectric receivers. •A touch to the surface of the sensor causes attenuation to a portion of the wave corresponding to touch position. •Touch location is based on the time delay from the transmitted pulse to the center of the attenuation area of the wave.