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Technical Discussions
12:13 Apr-18-2019

In phased array ,what was signal response represent?
( it represent only maximum amplitude from defect ?
is not clear to me , what a hat represent in inspection system when we have some calibration ,
for example i calibrate my system for -14 db or o db for certain flaw and then when i acqusition i have lower threshold ,
how can extract signal from ut device for pod when i have certain db for certain flaw ?


Edward Ginzel
R & D, -
Materials Research Institute, Canada, Joined Nov 1998, 1266

Edward Ginzel

R & D, -
Materials Research Institute,
Joined Nov 1998
18:13 Apr-18-2019
In Reply to Amir at 12:13 Apr-18-2019 (Opening).

In the NDE Reliability course provided by Extende there is a good section on the prerequisites to apply the "ahat vs a" method. A primary requirement is that there is a linear relationship of the amplitude response (ahat) to the flaw size (a). In addition, there should be a constant variance (homoscedasticity) around the regression straight line for all defect sizes. And, the distribution of the defects in the population must be Gaussian.
If these parameters cannot be seen in the data set, then it is not suitable for ahat vs a analysis and a Hit/Miss approach is usually used to develop the POD.


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