Advanced NDT
Time of flight diffraction (TOFD)

The TOFD technique uses two probes in a transmitter-receiver arrangement. When sound is introduced into the material via the transmitter the defect will oscillate. Each defect edge works as a source point of ultrasound signals.

These very weak signals are called diffracted waves and their appearance does not relate to the orientation of flat or spherical defects. These diffracted signals are received via the receiver probe. The diffracted signals are evaluated with the scale B-scan or D-scan images.

TOFD can be applied for wall thickness from 6mm up to 350 mm.

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