DEVICE TO CONVERT CAPACITIVE AND RESISTOR SENSORS PARAMETRES INTO FREQUENCY SIGNAL Russian patent published in 2009 - IPC G01N27/02 G01N27/22 

FIELD: instrument making.

SUBSTANCE: invention relates to instrument making, particularly, to converters of sensor parametres into frequency data signal. The proposed device comprises capacitive and resistor sensors, capacitance multiplier, resistor-capacitive self-oscillator, controlled switch. The switch incorporates control input and closing element. The capacitance multiplier output is connected to self-oscillator, not to frequency-forming capacitor. The self-oscillator output is connected to the device 1^st output. Additionally, the proposed device is furnished with the capacitor, reference signal generator and 2^nd output. The switch closing element is connected in series with aforesaid additional capacitor. The circuit made up of aforesaid additional capacitor and switch closing element, connected in series, is connected, in parallel to capacitive sensor, with non-inverting input of operating amplifier. The output of reference signal generator is connected to the switch control input and 2^nd output of the device.

EFFECT: higher accuracy of conversion, component for wiring multi-sensor intellectual pickups and remote control hardware.

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