USE OF BOTTOM ECHO PULSES FOR AMPLIFICATION OF THE IMAGE OF DEFECTS RECONSTRUCTED FROM DIGITAL ACOUSTIC HOLOGRAMS

Features of use of the method of projection in a spectral space for re construction of images of defects in specimens with plane-parallel sur faces from digital multifrequency acoustic holograms are considered. I n this case use of the method of projection in a spectral space assume s recording of the echo pulses having passed after dispersion on defec ts to the recording surface both directly and after reflection from th e bottom (''post bottom'' pulses). Additional information on the form of defects contained in ''post bottom'' echo pulses makes impossible t o more accurately determine the character of a defect and thereby, to increase inspection reliability. The results of experiments with model s of defects are given.