Apparatus for the time-dependent measurement of physical quantities

Claim 1

Apparatus for measuring the values of physical parameters, which comprises a plurality of transducers each operable to sense the value of a corresponding physical parameter to be measured and to establish, when excited, an electrical analog output signal representing the parameter value sensed; a demultiplexer having an input connected to a reference signal source and a plurality of outputs each connected to at least one corresponding transducer to connect same with said source to thereby electrically excite same by said source in sequence to thereby establish the respective output signals of said transducers; a multiplexer having a plurality of inputs each connected to at least one corresponding transducer to receive the output signal thereof, and an output; signal processing means connected to the output of said multiplexer to receive therethrough in sequence the output signals of said transducers and to recover from such signals the parameter value information thereof, said transducers being variable impedance devices in which the impedance varies in accordance with the value of the parameter sensed, and said reference signal source is an alternating voltage source whereby said transducer analog output signals are respective alternating voltages with amplitudes dependent upon the value of the parameter sensed.