Capacitance Meter of High Stability and Sensitivity, and Its Applications to Mechanical Measurements

Abstract

Capacitance measuring devices recently have come into universal use as error detectors in automatic control systems for industrial purpose. Needless to say, the most important characteristics required in such type of devices are sensitivity and stability. These two requirements, however, usually run counter to each other. A meter of high sensitivity, when put under long continuous operation condition, will cause a zero drift in its indication which greatly impedes measurement, especially when it is impossible to check the zero point in such case as in process of operation.
Described in this paper are principle of a capacitance meter of high stability and sensitivity, and its some applications to measurements of small displacement and thickness variation of strip.