User:DDABE3M3M/Eddy current probe

Eddy current probe, as the name implies, depends upon the eddy currents set up in the surface of the target material-shaft, collar etc adjacent to the probe The tip of the Eddy Probe contains an encapsulated wire coil which radiates the Drivers high frequency signal into the observed target as a magnetic field. The Driver outputs a dc voltage representing the field strength. As a conductive surface approaches the coil, eddy currents are generated on the target surface, which decreases the fields strength resulting in a decrease of the Drivers dc output. The Driver linearizes and normalizes its output to a specific sensitivity (usually 200Mv/mil) throughout its working range. The signals dc bias ,representing the average probe gap, and its AC component, profiling surface movement and irregularities, is readily used in many applications. Eddy current propes were used in the early 1980 to detect CAGR Fuel cracks in the Graphite sleeves.