Ultrasonic echographic apparatus using at least one piezoelectric transducer in association with a phase-randomizing screen, and method for the examination of a medium by means of such an echographic apparatus

摘要

The apparatus consists of at least one piezoelectric transducer (10, 13) providing for the emission and/or the reception of an ultrasonic beam (20) used for examination. A phase-randomising screen (11) located in the ultrasonic beam (20) used for examination and movable with respect to the axis of this beam is associated with at least one piezoelectric transducer (10). A system is provided for recording one echographic line e(t) for each position ( alpha ) of the said phase-randomising screen (11). The main technical effect of the presence of the phase-randomising screen on the ultrasonic path is to destroy the coherence of the wave passing through this screen. …??Application especially to medical ultrasonic echography and to the non-destructive testing of materials. …IMAGE…