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Embedded real-time ultrasound-based multi-touch system.

Maxime Bilodeau¹, Jérémy Moriot¹, Joëlle Fréchette-Viens¹

¹Department of Mechanical Engineering, Centre de Recherche Acoustique-Signal-Humain de l'Université de Sherbrooke, Université de Sherbrooke, Sherbrooke, J1K 2R1, Québec, Canadamaxime.bilodeau2@usherbrooke.ca, jeremy.moriot@usherbrooke.ca, joelle.frechette-viens@usherbrooke.ca, raphael.bouchard2@usherbrooke.ca, philippe.boulais@usherbrooke.ca, nicolas.quaegebeur@usherbrooke.ca, patrice.masson@usherbrooke.ca.

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Summary

This summary is machine-generated.

This study introduces an ultrasound-based touchscreen using Lamb waves for real-time multi-touch detection and localization on glass panels. The technology also enables relative pressure measurement, enhancing interactive surface capabilities.

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Area of Science:

Materials Science
Acoustics
Human-Computer Interaction

Background:

Traditional touchscreens face limitations in multi-touch accuracy and pressure sensing.
Ultrasound technology offers a potential avenue for advanced touch interaction.

Purpose of the Study:

To develop and evaluate an active ultrasound-based touchscreen system.
To enable real-time monitoring of multiple contacts on a glass panel.
To assess the feasibility of relative pressure measurement using this technology.

Main Methods:

Utilized fundamental Lamb wave modes generated by a linear chirp (50-100 kHz) via a piezoelectric ceramic lead zirconate titanate (PZT) transducer.
Employed four PZT elements for signal measurement.
Implemented real-time localization and detection on an i.MX 8M Nano system on module.

Main Results:

Demonstrated successful real-time multi-touch detection and localization on both sides of a 20x19 cm glass panel.
Confirmed the capability of Lamb waves for precise touch event tracking.
Validated the prototype's ability to perform relative pressure measurements.

Conclusions:

Active ultrasound-based touchscreen technology effectively enables real-time multi-touch detection and localization.
Lamb wave propagation is a viable method for advanced interactive surface applications.
The developed prototype shows promise for pressure-sensitive touch interfaces.