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Phased array instruments and ability to define anisotropic velocity?
Phased array instruments and ability to define anisotropic velocity?
Does anyone know of any PAUT equipment that allows you to define velocity as a function of angle? I believe that Olympus PipeWIZARD V4 has this capability, but beyond that I’m not aware of any regular sort of, “field portable” PAUT set that permits you define velocity as a function of angle (a “velocity vector”, if you will).
Last year I came across this problem first hand while inspecting welds on TMCP pipeline steel. Ed Ginzel and I got a sample, and figured out a very simple way to calibrate for it using two phased array probes in pitch-catch, placed on the pipe material. It was much more common than we thought. I fear they may be many PAUT crews out there looking at “melting S-scans”, and plotting defects incorrectly. This is something that we hope (one day ) to be integrated into field portable PAUT equipment (hint hint my PAUT OEMs!).
The first paper explains the procedure:
https://www.ndt.net/article/ndtnet/papers/Calibration_for_Anisotropic_Effects_on_Shear_Wave_Velocity_for_Improvements_of_Weld_Inspections_in_TMCP_Steels.pdfThen we published two more papers because we simply couldn’t stop ourselves (too interesting!):
https://www.ndt.net/article/ndtnet/papers/Visualisation_of_Acoustic_Birefringence.pdfI also did a video explaining the simple calibration setup:
https://youtu.be/aPxKdGmMUmM- 0 Replies
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