Eddy Current Method
This method is commonly used for the inspection of non-ferromagnetic tubes in heat exchangers. The inspection is done with a bobbin coil, the coil produces an electromagnetic field in the tube. When the probe is pulled along a discontinuity, the electromagnetic field is distorted. This distortion in the electromagnetic field changes the coil impedance related to the discontinuity. For special defects or defects inside tube sheets a rotating probe is used.
- Wall thickness reduction
- Local pitting
- Baffle hammering
internal coaxial probe, rotating probe
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