All ultrasonic probes are calibrated (except the one for surface waves). We also managed to do measurements of thickness for samples (probably) made out of aluminium. The results are encouraging. After comparing with data obtained by caliper, we found it as correct. The second measured thing was velocity of longitudinal waves. Our results are similar to the values taken from literature (only for ALU samples).
As you noticed, we got some delay according to scheme published two weeks ago. We hope to work more efficently next time.
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