Eddy current detector for detecting an object with offset compensation

摘要

An RF oscillator induces eddy currents to be measured in an object. An eddy current probe senses alterations, such as teeth on a disc, for example, in the object which are represented as eddy current signals sensed by an eddy current probe. The present invention separates alteration current signals from offset currents in the eddy current signal to aid in discriminating levels in the alteration current signals. The alteration currents are separated from the offset currents by AC coupling with a high pass filter or separated by a microprocessor as part of a data processing detection routine.