While eddy current technology has long been used in the testing of bar, tube, and wire stock, advances in
electronics, automation, and coil design have paved the way for a new generation of testers specifically
designed for component testing applications. This includes the testing of gears and bearings which go into
automotive and industrial applications. These testing systems easily integrate into production processes
allowing for in-line testing at production line speeds. In addition to enabling 1 00% of production components
to be inspected, it can help monitor upstream processes notifying operators that something is not functioning
correctly. This greatly reduces scrap and warranty costs for gear and bearing manufacturers.
Eddy current crack testing is performed by passing a small pair of coil windings over a section of the
component to be tested. These coil windings are small enough to test between gear teeth, and with multi-coil
probes can testverycomplexshapes. Mostcracktestapplications require onlyone testfrequencysince most
tests require the detection of only surface flaws. Simultaneous testing with multiple frequencies allows for
testing of both surface and sub-surface defects when inspecting non-ferromagnetic parts.

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