UT - Corner echoes with SV mode: Influence of the refraction angle


A 10×15 mm notch is manufactured in a steel mock-up of 47 mm thickness. An immersion probe is used to generate SV waves with different orientations in order to analyze the influence of the refraction angle on CIVA predictions precisions.



The probe orientation is changed in order to generate SV45, SV50, SV55, SV60 and SV65 waves.



A circular immersion probe of Ø12.7 mm with 50 mm water path is used. The input signal central frequency is 2.25 MHz, its bandwidth 60% and its phase 0°.

The results are calibrated relatively to a Ø2 mm SDH of 48 mm length, inspected at 45°.



The discrepancy between experimental and simulated results is always between 1 and 3 dB: CIVA slightly overestimates corner echoes but the offset in amplitude is almost unchanged for all refraction angles.


B-scans have been stored for this case.



These figures show that, for the largest angles, the corner echo is not located at the bottom of the notch, we observe a shift of the corner echo maximum. This behavior is well predicted by CIVA and is explained here.


Continue to Simultaneous influence of the notch height and the refraction angle

Back to Corner Echoes with SV mode

Back to Corner Echoes