This paper describes material discrimination by means of a multifunctional touch-sensor based on piezoelectric ceramics. In the proposed sensor, the electrical property and ultrasonic characteristic of an object are measured by the proposed sensor which is contacted to the object, and the information of the object is detected from their measured values. As the experiment, discrimination of four kinds of materials such as aluminum, polymer gel, acrylic resin and silicone rubber, and detection of the thickness are demonstrated from measurements of capacitance as the electrical property and propagation time as the ultrasonic characteristic by the proposed sensor. As a result, discrimination of four kinds of materials and detection of the thickness at the range between 10mm and 40mm were possible. Therefore, the usefulness of the proposed multifunctional touch-sensor was suggested.
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