Non-destructive testing of a mechanical part made of a polycrystalline material

A device for non-destructive testing of a mechanical part made of a polycrystalline material, comprising:

• an ultrasonic probe including a two-dimensional array of transducers capable of emitting and receiving signals at different excitation angles, and
• a processor configured to
• test the transducers in emission and in reception,
• process the signals received by the transducers so as to express the signals received by the transducers in two planes of plane-waves constructed from emission and reception wave vectors of the probe by summation and difference of the wave vectors associated respectively with the plane-waves emitted and received by the probe, and
• deduce information representative of a three-dimensional orientation of a fiber structure of the mechanical part.