10 October 2013

UltraHaptics

Multi-touch surfaces offer easy interaction in public spaces, with people being able to walk-up and use them.  However, people cannot feel what they have touched.  A team from the University of Bristol’s Interaction and Graphics (BIG) research group has developed a solution that not only allows people to feel what is on the screen, but also receive invisible information before they touch it. UltraHaptics, is a system designed to provide multipoint, mid-air haptic feedback above a touch surface. UltraHaptics uses the principle of acoustic radiation force where a phased array of ultrasonic transducers is used to exert forces on a target in mid-air.  Haptic sensations are projected through a screen and directly onto the user’s hands. The use of ultrasonic vibrations is a new technique for delivering tactile sensations to the user.  A series of ultrasonic transducers emit very high frequency sound waves.


When all of the sound waves meet at the same location at the same time, they create sensations on a human’s skin. By carrying out technical evaluations, the team has shown that the system is capable of creating individual points of feedback that are far beyond the perception threshold of the human hand.  The researchers have also established the necessary properties of a display surface that is transparent to 40 kHz ultrasound. The results from two user studies have demonstrated that feedback points with different tactile properties can be distinguished at smaller separations.  The researchers also found that users are able to identify different tactile properties with training. Finally, the research team explored three new areas of interaction possibilities that UltraHaptics can provide: mid-air gestures, tactile information layers and visually restricted displays, and created an application for each.

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