Combined angular displacement measuring system and multiplier - has bubble level sensor connected to amplifier and demodulator fed with AC reference signal

摘要

A combined angular displacement measuring and multiplier system incorporates a bubble-type level sensor responsive to an AC excitation signal for producing an output having an amplitude proportional to the amplitude of the AC excitation signal and to the angular displacement of the sensor from a reference level. A modulator coupled to the sensor for supplying the AC excitation signal. A first input circuit is coupled to the modulator for supplying an AC reference signal. A second input circuit is coupled to the modulator for supplying a second input signal to be amplitude modulated on the AC reference signal. An output circuit is coupled to the sensor for deriving an output signal having an amplitude representative of the product of the angular displacement of the sensor from the reference level and the amplitude of the second input signal.