Electromagnetic Testing Eddy Current in Brief
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There are two basic types of coil probes used <strong>in</strong> eddy current <strong>in</strong>spection; the<br />
absolute probe and the differential probe. An absolute probe consists of a<br />
s<strong>in</strong>gle pickup coil which can be fashioned <strong>in</strong> a variety of shapes. Absolute<br />
probes are very good for sort<strong>in</strong>g metals and detection of cracks <strong>in</strong> many<br />
situations. Absolute coils can detect both sharp changes <strong>in</strong> impedance and<br />
gradual changes. They are however, sensitive to material variations,<br />
temperature changes, etc.<br />
Charlie Chong/ Fion Zhang
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