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Vol. 207, Issue 12, December 2016, pp. 36-43




Preliminary Studies on Capacitive Proximity Sensing for Touchless Interaction
with a Human Finger

* Leonhard HASLINGER and Bernhard G. ZAGAR

Johannes Kepler University Linz, Institute for Measurement Technology, Altenberger Stra?e 69, 4040 Linz, Austria
Tel.: +43 732 2468 5923, fax: +43 732 2468 5933

* E-mail: leonhard.haslinger@jku.at


Received: 5 November 2016 /Accepted: 5 December 2016 /Published: 30 December 2016

Digital Sensors and Sensor Sysstems


Abstract: This contribution deals with preliminary studies for touchless interaction based on capacitive sensor technologies. An existing approach in combination with additional capacitance measurements is used for position estimation. For that, a measurement system is utilized which is able to measure capacitances in a range of a few fF to several pF. The main focus is the 3D position estimation of a human finger through measuring the spatial capacitance distributions caused by its movements. A grounded metallic test object is used as an abstract model of a finger. The capacitance modeling is based on a 2D simplification by considering properties of symmetry. This new model, combined with complex data processing algorithms, ensures precise finger gesture recognition in future research.


Keywords: Modeling, 3D position estimation, Capacitive proximity sensors, Touchless interaction, Electric field.


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