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Technical Discussions
Turkey, Joined Oct 2014, 39


Joined Oct 2014
16:20 Jun-22-2016
Maximum Apmlitude Sizing in PA


May I know your idea about applicability and accuracy of "Maximum Amplitude sizing" for height sizing of defects detected in an un-focused phased array data (inspection beyond the near zone) , when I compared sizing accuracy with ToFD I realized that using 6dB is not accurate enough, all defects were oversized.

Also Could you please introduce a reference about "Maximum Amplitude sizing", I'm interested to read about it.

Kind Regards,

Andrew Cunningham
NDT Inspector
Canada, Joined Jun 2008, 238

Andrew Cunningham

NDT Inspector
Joined Jun 2008
22:25 Jun-22-2016
Re: Maximum Apmlitude Sizing in PA
In Reply to Arman at 16:20 Jun-22-2016 (Opening).

The Max Amp cross sectional sizing method stands head and shoulders against any other sizing methods if you have been taught properly and have practiced, practiced and practiced. Max Amp is not so good for length, it is very dependent on the type of discontinuity you are trying to size. Multi-faceted reflectors (slag, crack and porosity) can be sized easily, but fusion type can be grossly under sized. So defect characterization is a part of Max Amp training.


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