Acoustic Wave

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Acoustic wave touch screens use transducers mounted at the edge of a glas overlay to emit ultrasonic sound waves along two sides. These waves are reflected across the surface of the glass received by sensors. A finger or other soft tipped stylus absorbs some of the acoustic energy and the controller measures the amplitude change of the wave to determine touch location.

 

Advantages

  • good optical clarity
  • z-axis capability
  • durable glass front

Disadvantages

  • requires finger or sound absorbing stylus
  • difficult to industrialize
  • signal affected by surface liquids or other contaminants