INTERFACE CIRCUIT FOR CAPACITIVE SENSOR

AN INTERFACE CIRCUIT FOR FRINGING ELECTRIC FIELD CAPACITIVE SENSOR (20) SUITABLE FOR MONITORING HUMIDITY IS DESCRIBED. THE INTERFACE CIRCUIT COMPRISES A PULSE WIDTH MODULATOR (30) AND A PULSE WIDTH MODULATION TO DC SIGNAL CONVERTER (40). THE PULSE WIDTH MODULATOR (30) IS CONFIGURED TO PRODUCE PULSE...

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Bibliographische Detailangaben
Hauptverfasser:	YUZMAN YUSOFF, WEE LEONG SON, HASMAYADI ABDUL MAJID
Format:	Patent
Sprache:	eng
Schlagworte:	ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS MEASURING MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR PHYSICS TARIFF METERING APPARATUS TESTING
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Beschreibung
Zusammenfassung:	AN INTERFACE CIRCUIT FOR FRINGING ELECTRIC FIELD CAPACITIVE SENSOR (20) SUITABLE FOR MONITORING HUMIDITY IS DESCRIBED. THE INTERFACE CIRCUIT COMPRISES A PULSE WIDTH MODULATOR (30) AND A PULSE WIDTH MODULATION TO DC SIGNAL CONVERTER (40). THE PULSE WIDTH MODULATOR (30) IS CONFIGURED TO PRODUCE PULSE WIDTH MODULATION PROPORTIONAL TO THE PHASE DIFFERENCE OF SIGNALS BETWEEN A SENSOR AND A REFERENCE SIGNAL. THE PULSE WIDTH MODULATION IS THEN CONVERTED TO DC SIGNAL, SAID DC SIGNAL HAVING AN AMPLITUDE PROPORTIONAL TO PULSE WIDTH MODULATION. THE OUTPUT PRODUCED IS A DC SIGNAL PROPORTIONAL TO THE PHASE DIFFERENCE OF SIGNALS BETWEEN SENSOR AND REFERENCE SIGNAL.