CPC G01N 29/043 (2013.01) [G01N 29/262 (2013.01); G01N 2291/0289 (2013.01); G01N 2291/106 (2013.01)] | 12 Claims |
1. A method for the non-destructive testing of a mechanical part by propagation of ultrasonic waves accomplished by means of a multi-element transducer placed opposite the mechanical part and comprising a plurality of piezoelectric elements e(1), e(2), . . . , e(N), N designating an integer greater than 1, said testing method comprising:
a measuring step comprising, for each element e(i) of the transducer, the emission of an ultrasonic wave at a given frequency and the measurement, by each element e(j) of the transducer distinct from the element e(i), of a time-varying signal denoted kij(t) representing the back-scattered ultrasound wave received by the element e(j);
a step of determining at least one first matrix of time-varying components based on the measured signals kij(t), i, j=1, . . . , N, taken over a predetermined duration around a time reference denoted T;
a step of determining at least one second matrix of frequency components corresponding to a predetermined frequency 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 step of filtering said at least one second matrix comprising a projection of said at least one second matrix of frequency components onto a single scattering sub-space; and
a step of verifying the integrity of the mechanical part by using said at least one filtered second matrix;
the testing method being characterized in that the single scattering sub-space used during the filtering step is determined by means of a numerical calculation using a ray tracing algorithm.
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