Ultrasonic target for the purposes of non-destructive inspection

A method for detecting a movement of an ultrasonic target that includes a main reflector comprising three main faces, extending from a main vertex, the main faces forming a main trirectangular trihedron by lying on orthogonal planes, and defining a main base plane, lying facing the main vertex, and forming a base of the main trirectangular trihedron;

• and
• at least one auxiliary reflector fastened to the main reflector, each of the at least one auxiliary reflector comprising three auxiliary faces, extending from an auxiliary vertex, the auxiliary faces forming an auxiliary trirectangular trihedron, and defining an auxiliary base plane, lying facing the auxiliary vertex, and forming a base of the auxiliary trirectangular trihedron, wherein
• the auxiliary base plane or each auxiliary base plane is parallel to the main base plane, two adjacent main faces of said main trirectangular trihedron are separated by a ridge and extending from the main vertex, at least one auxiliary reflector is an internal auxiliary reflector, the auxiliary vertex of the internal auxiliary reflector is located on said ridge, and the internal auxiliary reflector is delineated by:
• said adjacent main faces, forming the auxiliary faces of the internal auxiliary reflector;
• and a transverse auxiliary face extending between the adjacent main faces, parallel to a main face opposite said adjacent main faces, the method comprising, during an inspecting phase:
• a) exposing the target to an incident acoustic wave emitted by an acoustic emitting source, the target being separated from the acoustic emitting source, the incident acoustic wave propagating along an axis of incidence, the axis of incidence being inclined by an angle smaller than 30° to an axis perpendicular to the base plane of the target;
• b) consecutively to a), detecting an acoustic wave reflected by the target, the reflected acoustic wave propagating along an axis of reflection parallel to the axis of incidence;
• c) on a basis of the acoustic wave detected in b), determining a position of the target, the position comprising a location and/or an orientation of the target;
• d) taking into account a reference position of the target, comprising a reference location and/or a reference orientation of the target;
• and
• e) comparing the position of the target, resulting from c), with the reference position.