VARIABLE CAPACITANCE DETECTING DEVICES
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Abstract
VARIABLE CAPACITANCE DETECTING DEVICES ARE DESCRIBED IN WHICH A CONDUCTIVE MEMBER INSULATED FROM THE FIXED AND MOVEABLE ELECTRODES IS DISPOSED WITHIN THE DEVICE ACROSS THE LEAKAGE PATH OF ONE OR MORE OF THE ELECTRODES. AN AMPLIFIER OF UNITY GAIN IS CONNECTED TO ESTABLISH THE SAME INSTANTANEOUS VOLTAGE AND PHASE ON THE CONDUCTIVE MEMBER AS THAT ON THE ELECTRODE. WHERE THE ELECTRODES ARE WITHIN A HOUSING FROM WHICH LEADS ARE FED THROUGH TO EXTERIOR CIRCUITRY, THE LEAD FROM THE CONDUCTIVE MEMBER SURROUNDS THE LEAD FROM ONE OF THE ELECTRODES. A PRESSURE TRANSDUCER FOR NON-CONDUCTIVE FLUIDS IS SHOWN IN WHICH THE CONDUCTIVE MEMBER IS A CONDUCTIVE COATING APPLIED TO A DIELECTRIC PLATE, SURROUNDING THE FIXED ELECTRODE WHICH IS ALSO CARRIED BY THE PLATE. TWO OF THESE PLATES ARE MOUNTED ON OPPOSITE SIDES OF A DIAPHRAGM TO ACHIEVE A BALANCED TRANSDUCER, AND LEADS FROM THE CONDUCTIVE BANDS PASS THROUGH APERTURES IN THE PLATE.
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