Nonlinear Twin-T Network for Capacitive Transducers

Abstract

A circuit is described which converts the capacitance variation of a capacitive transducer into analogous voltage and current signals. Direct current output voltages of the order of 10 V and dc currents in the milliampere range are obtained for a variation of capacitance of 10 pF. At maximum sensitivity, the output is practically independent of variations of the source frequency. Sensitivities of the order of 1000 V/in. can be obtained when used with transducers for the measurement of small displacements.