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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.