Eddy Current Probe
A non-contact electrical device that measures the displacement of one surface relative to the tip of the probe.
Construction consists of an electrical coil of various lengths and diameters. This coil located in the tip of the probe and is energized producing an electrical field around the tip of the probe. When a conductive surface is placed in the field and the distance from the probe is noted, variations in this gap can be determined by the variations in the voltage flow to the probe tip.
See also: Eddy Currents.