Reconstruction of flaw images by the C-SAFT method from echo signals measured by an antenna array in the triple-scanning mode |
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Authors: | E G Bazulin |
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Affiliation: | 1.ECHO+ Ltd. Research and Production Center,Moscow,Russia |
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Abstract: | The application of antenna matrices (AMs) for obtaining flaw images during automated nondestructive ultrasonic testing is
considered. The conventional technique of using an AM as a phased AM (PAM) has a number of drawbacks. One of them is related
to the small number of AM elements and consists in a low frontal resolution of the thus-formed images. Scanning with an AM
operating in the double scanning mode, viz., the so-called triple-scanning mode, allows coherent summation of partial images
for each position and obtaining a resulting image with a frontal resolution that cannot be attained with a PAM. In order to
test the serviceability of the proposed algorithm in the CIVA program, echo signals reflected from a crack model with a height
of 6 mm and a length of 30 mm in a tested object, which simulated a welded joint of a pipeline with a conventional diameter
of 800 mm (дy800), were calculated. The results of the reconstruction of images of model objects in the form of a drilled
side hole with a diameter of 6 mm at a depth of 15 mm in a CO-2 specimen and a fatigue crack in a welded joint of a д y800
pipeline are presented. To reduce the influence of reverberation noise, a B-type median template was subtracted from echo
signals. The flaw images that were reconstructed in numerical and model experiments demonstrate the efficiency of the proposed
algorithm. |
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