Method for displaying in real time a signal for non-destructive testing of a mechanical part

A method for visualizing, in real time, a signal for the non-destructive testing of a mechanical part, the signal being emitted by a non-destructive testing device comprising:

• an optical motion tracking system to which a reference coordinate system (R0) is tied,
• a sensor holder,
• a rigid body,
• a non-destructive testing sensor integral with the sensor holder connected fixedly to the rigid body, and
• a computer;
• the visualization method being executed by an augmented reality visualization device facing the mechanical part, to which an augmented reality coordinate system (RA) is tied,
• the method comprising the following steps:
• moving the non-destructive testing sensor over an examination area of the mechanical part;
• at the same time as the step of moving the non-destructive testing sensor, emitting the signal from a point of emission along an emission axis and receiving the signal by way of the sensor;
• determining, by way of the computer, a cut-out of an occlusion inside the mechanical part, the cut-out being centered around the point of emission;
• determining, by way of the computer, a signal visualization surface constructed from the paths of the signal, this surface being located inside the cut-out;
• visualizing, on the augmented reality visualization device,
• a real view of the mechanical part, of the sensor holder and of the non-destructive testing sensor,
• a holographic 3D representation of the mechanical part, of the sensor holder and of the non-destructive testing sensor, which are superimposed on the real view, and
• a holographic representation of the cut-out of the occlusion of the part and of the signal visualization surface, which are superimposed on the real view,
• the occlusion being produced at least partially by superimposing the holographic 3D representation of the mechanical part on the real view of the mechanical part, the cut-out of the occlusion passing through the depth of the mechanical part in its holographic 3D representation until reaching the signal visualization surface,
• the signal visualization surface being a quadric that is determined so as to correspond to a mesh formed by the paths of said signals propagating in the mechanical part.