Dear All
in which standard or guide , establishing of refrence gain or sensitivity for evaluation in PHASED ARRAY is mentioned?
DAC or TCG or another way is applicable?
regards
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2 comments:
Phased Array UT is referenced in the appendix. PA-UT is normally used in lu of radiography. Additionally phased array is not treated like UT-shearwave, DAC is not applicable. Reference levels are normally set off of a reference standard genereated from a drop of the same material being tested and defects are accepted/rejected accordingly.
BR:
The same accept-reject criteria are used for phased arrays as for conventional UT. This makes sense as PA do not change the physics of ultrasound. So, you can find the acceptance criteria in ASME, API, AWS or any internaltional code.
For your second question, TCG is far superior to DAC for encoded PA scans. Here, the operator can set the color palette to detect above threshold defects as a distinctive color. That way, it is quick and easy to see defects. DAC does not allow this easy solution.
MM.
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