Capacitive probe detection systems

摘要

A capacitive probe detection system is described which incorporates a synchronous switching system to switch the current flow through a capacitive probe to a signal integrating circuit only during the whole of every positive half cycle of the current flow attributable to the capacitive component of the probe. In this way that current due to the resistive component of the probe and to spurious noise pulses is eliminated by the integrator when performing its integrating action.