5B-3. Special Probe Waveforms for Flaw Detection at “Hot Spots”

In this paper we examine the creation of a special probe waveform that, when applied to an emitting transducer at location A, results in a strong received signal at that transducer at a particular later time only when a scattering center is present at location B. The probing waveform can be calculated directly from the Green’s function for propagation from A to B. Such a probe waveform can be used to detect scattering centers at the “hot spot” location B.