Method and system for the non-destructive testing of a mechanical part

A system for non-destructively testing a mechanical part comprising:

• a multi-element transducer placed opposite the mechanical part and capable of emitting ultrasonic waves, said transducer comprising a plurality of piezoelectric elements e(1), e(2), . . . , e(N), N designating an integer greater than 1, said transducer being configured to emit, via each element e(i) of the transducer, an ultrasonic wave at a given frequency, and to measure, via each element e(j) of the transducer distinct from the element e(i), a time-varying signal denoted kij(t) representing the back-scattered ultrasonic wave received by the element e(j);
• a validation device comprising:
• a first determination module, configured to determine at least one first matrix of time-varying components based on the measured signals kij(t), i,j=1, . . . , N, taken for a predetermined duration around a time reference denoted T;
• a second determination module, configured to determine at least one second matrix of frequency components corresponding to a frequency determined based on the frequency of the sound wave by applying a Fourier transformation to the time-varying components of said at least one first matrix;
• a filtering module, configured to filter said at least one second matrix by projecting said at least one second matrix of frequency components onto a single scattering sub-space;
• and
• an analysis module, configured to verify the integrity of the mechanical part by using said at least one filtered second matrix;
• the testing system being characterized in that said filtering module is configured to determine the single scattering sub-space by means of a numerical calculation using a ray tracing algorithm.