The principle and application of a single planar capacitance sensor

This paper presents the working principle and the three types of equivalent circuit of a special variable capacitance transducer, which consists of serial capacitive plates to be put on a sigle plane including the method of analysing the circuit by using Laplacian impedance. The paper also describes the circuits of capacitive reactance and frequency(Cx/Fx) conversion, the techniques of the fx/d conversion, data processing and the digital displaying circuit of a high performance monocomputer.