A flaw detection system using acoustic Doppler effect for detecting flaws
in a medium wherein there is relative motion between the medium and system
includes a transducer, spaced from the medium to be inspected, for
introducing to and sensing from the medium an acoustic signal that
propagates in the medium at a predetermined frequency; and a detector,
responsive to the sensed propagating acoustic signal, for detecting in the
sensed acoustic signal the Doppler shifted frequency representative of a
flaw in the medium.
