A Ø12.7 mm immersion probe is used in order to generate SV waves at different refraction angles with a water path of 20 mm.
|Height||2 mm||2 mm||2 mm||6 mm|
|Length||2 mm||5 mm||15 mm||15 mm|
SV45 to SV65 inspections are performed with a Ø12,7 mm circular immersion probe functionning at 4.5 MHz with 20 mm water path. The input signal central frequency is 4.5 MHz, the bandwidth 73% and the phase 270°.
The results are calibrated relatively to a Ø2 mm SDH of 40 mm length located at 15 mm depth.
Whatever the refraction angle, there is a good agreement between experimental results and CIVA on the highest notch (6×15 mm). For the 2 mm high notches, CIVA does not predict accurately the corner echo amplitude for the 55° refraction angle, close to the 57° T-waves critical angle. The difference becomes larger as the notch length gets smaller. Except for this 55° refraction angle, the whole results globally predict a good agreement between CIVA and the experiment.
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