Discrimination of Material Properties by Mono-Structural Touch Sensor with Capacitive-Inductive Function
Desheng Li and Katsunori Shida
Faculty of Science and Engineering, Saga University, 1 Honjo-cho, Saga, 840 Japan
This paper describes the development of a touch sensor, which has a mono-structure but has two kinds of functions for discrimination of material properties. The proposed sensor is used to discriminate materials such as iron, aluminum, copper, bronze, rubber, wood, acrylic resin, and styrene foam. The sensor consists of two spiral metallic lines and four terminals. When the two lines are used as a pair of coils, the sensor has the property of inductance. Otherwise, when the two lines are used as a pair of parallel electrodes, the sensor has the property of capacitance. The experiments show good results in discriminating each material sample, and the new sensor is expected to serve as a step toward the development of an artificial skin tactile sensing system in the future.