INTERFACE CIRCUIT FOR CAPACITIVE SENSOR

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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Hauptverfasser: YUZMAN YUSOFF, WEE LEONG SON, HASMAYADI ABDUL MAJID
Format: Patent
Sprache:eng
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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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creator YUZMAN YUSOFF
WEE LEONG SON
HASMAYADI ABDUL MAJID
description 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.
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subjects 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
title INTERFACE CIRCUIT FOR CAPACITIVE SENSOR
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