A new mono-structural thin plate touch sensor with four sensingfunctions to discriminate the characteristics of materials by putting onthe surface of test materials is proposed. Each of these four kinds ofsensing functions, that is, a thermal sensing function, an inductivesensing function, a capacitive sensing function and a hardness sensingfunction in the mono-structural sensor can be realized by changing theconnection of wiring between a measurement circuit and the sensor. Thissensor consists of a pair of thin filamentary spiral copper wires. Eachwire is evaporated on the surface of a thin insulating substrate. Toinvestigate the sensing ability for the four sensing functions,measurements were made on eight kinds of well-known material: iron,aluminum, copper, bronze, gum, plywood, acrylic resin and styrene foam.The spiral wires of the sensor are tightly placed on the surface of eachtest material through a thin insulating film. It was found that thetypical sample materials could be roughly separated into four kinds,that is, iron, gum, a group of plywood, acrylic reign and styrene foam,and a group of aluminum, copper and bronze. The technique of patternrecognition by multi-dimensional indication of data was adopted todiscriminate material properties. This study provide some usefulinformation for the future realization of an artificial materialproperty recognition system in the industrial field
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