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ULTRASOUND INSTITUTE
The Ultrasound Institute can develop new advanced ultrasonic measurement, imaging and NDT techniques for non-conventional applications.
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Technical Discussions
Mir
Mir
18:23 Apr-07-2016
Rapid dB drop technique

During the PAUT study, I found the rapid dB drop technique (PAUT length sizing technique)sizing technique on Olympus webinar.

what is the rapid dB drop technique ?

 
 Reply 
 
Paul Holloway
Consultant,
Holloway NDT & Engineering Inc , Canada, Joined Apr 2010, 191

Paul Holloway

Consultant,
Holloway NDT & Engineering Inc ,
Canada,
Joined Apr 2010
191
19:08 Apr-07-2016
Re: Rapid dB drop technique
In Reply to Mir at 18:23 Apr-07-2016 (Opening).

Mir,

A simple Google search would have yielded you the following:

http://www.slideshare.net/OlympusIMS/omnipc-flaw-sizing-demo-35926077

1
 
 Reply 
 
Mir
NDT Inspector,
South Korea, Joined Apr 2016, 1

Mir

NDT Inspector,
South Korea,
Joined Apr 2016
1
19:40 Apr-07-2016
Re: Rapid dB drop technique
In Reply to Paul Holloway at 19:08 Apr-07-2016 .

Thanks for your information.

How can you apply the rapid dB drop technique?
can you give me the detail informations?

 
 Reply 
 
Daniel Braun
Daniel Braun
07:31 Apr-12-2016
Re: Rapid dB drop technique
In Reply to Mir at 19:40 Apr-07-2016 .

"Rapid dB Drop Technique" is just another new name for the technique, which is known since more than 50 years ago. Actually you may read the book for the Level I operators http://www.ndt.net/article/v05n09/berke/berke.pdf - chapter 6 related to the defects evaluation. In case of having the recorded A-Scans some dB drop for the defect sizing is implementable easily in the postprocessing software for every discontinuity recognized by the software - every state of the art PA instrument is equipped with this function, may be just the name of the function is different from one brand to another. However - with reference to the above book - this technique has a limitation - it may not be applied to the compact defects, which have the dimensions smaller than the beam width - in that case it is necessary to refer to the echo amplitude

 
 Reply 
 

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