System and method for inductively excited thermography

摘要

Testing device for the detection of delaminations, cracks or of material defects in surfaces, with a transmitter (11) with which a test piece (12) can be acted upon with an electromagnetic field, and a receiver (13) with which a by the transmitter (11) by means of an inductive coupling in the specimen (12) at least in certain areas caused by the heat distribution is detectable, characterized in that the transmitter is an array of coils (21, 31), and in that the transmitter modulation means for the amplitude modulated current through the coils, which are configured in such a way that, in the unit under test (12) temporally variable lateral heat distribution with a certain direction of propagation are be.