MEASURING TRANSDUCER OF NON-ELECTRIC PARAMETERS BY CAPACITANCE PICK-UP Russian patent published in 1994 - IPC

FIELD: electric measuring devices. SUBSTANCE: device has supply of stabilized direct voltage, linear inverter, adders, rectangular voltage oscillator, commutators, differential capacitor, amplifier, phase sensitive detector. Outer plates of differential capacitor are supplied by rectangular voltage in opposite phase which are generated by means of commutation of output voltage. Signal, which is picked from middle plate of differential capacitor, are amplified by amplifier and rectified by phase sensitive detector. Output voltage from phase sensitive detector supplies output terminals of transducer. This voltage is also added to output voltage of supply of stabilized direct voltage. This provides negative feedback for transducer. EFFECT: increased functional capabilities. 1 dwg