Eddy Current Method
This is a method for inspection of non-ferromagnetic tubes in heat exchangers. The test is performed with a bobbin coil that produces an electromagnetic field in the tube. When the probe is pulled across a discontinuity, the electromagnetic field is distorted. This distortion in magnetic field changes the coil impedance that is related tot he discontinuity. For special defects or defects at special locations a rotating probe is used.
Defects that can be detected:
- wall loss
- baffle hammering
internal coaxial probe, rotating probe
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