US 11,747,307 B2
Method and system for the non-destructive testing of a mechanical part
Aurélien Baelde, Moissy-Cramayel (FR); Claire Prada, Paris (FR); and Frédéric Jenson, Moissy-Cramayel (FR)
Assigned to SAFRAN, Paris (FR); and CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE, Paris (FR)
Appl. No. 17/49,944
Filed by SAFRAN, Paris (FR); and CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE, Paris (FR)
PCT Filed Apr. 19, 2019, PCT No. PCT/FR2019/050950
§ 371(c)(1), (2) Date Oct. 22, 2020,
PCT Pub. No. WO2019/207243, PCT Pub. Date Oct. 31, 2019.
Claims priority of application No. 1853544 (FR), filed on Apr. 23, 2018.
Prior Publication US 2021/0239652 A1, Aug. 5, 2021
Int. Cl. G01N 29/04 (2006.01); G01N 29/26 (2006.01)
CPC G01N 29/043 (2013.01) [G01N 29/262 (2013.01); G01N 2291/0289 (2013.01); G01N 2291/106 (2013.01)] 12 Claims
OG exemplary drawing
 
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.