Eddy Current Thermography 

ECT Eddy Current Thermography is an active thermography technique where eddy currents induced into conductive materials generate heat. The heat diffuses across the component. The presence of a defect interrupts the flow of the eddy currents as in conventional eddy current testing (also sometimes referred to as ECT) and generates variations in the eddy current density and consequentially variations in heat. An infrared camera maps the heat distribution, allowing the defect to be detected.

ECT combines the depth capability of conventional eddy current testing with the fast and non-contact features of thermography.

For more information on ECT, 

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