Commissariat a L'energie Atomique

Ecole Centrale Des Arts Et Manufactures

Daniel De Vadder

Robert Saglio

Driss Bouami

Non-destructive method for determining at least one point of a crack

The fault-containing area to be inspected is insonified by means of an ultrasonic transducer with a space-limited beam which is displaced in stepwise manner, the signals coming from the successively insonified areas being detected by several receivers, the phases and amplitudes of the signals being determined and the reconstitution of the area to be inspected performed. There is a main image of the fault and also parasitic images thereof. The number of receivers is chosen in such a way that the distance between the parasitic images and the main image exceeds the width of the area insonified by the transmitter and the reconstitution is only carried out in the insonified areas having given rise to a signal in order to eliminate the parasitic images. Application to the non-destructive inspection of mechanical parts.

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Verrieres le buisson, France

Daniel De Vadder