Sensor capacity sensing apparatus and sensor capacity sensing method

A capacitor C and an impedance converter Hiz are included in a feedback circuit of the first operational amplifier OP1 in series; an electrode P1 of a capacitive sensor is connected to a connection point of the said capacitor and the converter via a signal line L. The signal line L is connected to a...

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Bibliographische Detailangaben
1. Verfasser:	YAKABE MASAMI
Format:	Patent
Sprache:	eng
Schlagworte:	ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS DEAF-AID SETS ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKEACOUSTIC ELECTROMECHANICAL TRANSDUCERS MEASURING MEASURING ELECTRIC VARIABLES MEASURING MAGNETIC VARIABLES MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR PHYSICS PUBLIC ADDRESS SYSTEMS TARIFF METERING APPARATUS TESTING
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Beschreibung
Zusammenfassung:	A capacitor C and an impedance converter Hiz are included in a feedback circuit of the first operational amplifier OP1 in series; an electrode P1 of a capacitive sensor is connected to a connection point of the said capacitor and the converter via a signal line L. The signal line L is connected to a predetermined standard electric potential through resistance R3 whose resistance value is high. When the capacitor is included in the feedback circuit, the signal line becomes in a state of floating and a circuit operation becomes unstable, however, the signal line L is fixed at predetermined electric potential, and therefore, the operation becomes stable. It is acceptable to configure the impedance converter with a voltage follower and connect the resistance R3 to the output.