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Technical Discussions
feriha irani
India, Joined Mar 2019, 1

feriha irani

India,
Joined Mar 2019
1
11:33 Aug-01-2019
PAUT

How to calculate width of single element in PAUT Linear Probe ?

 
 Reply 
 
Paul Holloway
Consultant,
Holloway NDT & Engineering Inc , Canada, Joined Apr 2010, 242

Paul Holloway

Consultant,
Holloway NDT & Engineering Inc ,
Canada,
Joined Apr 2010
242
16:16 Aug-01-2019
Re: PAUT
In Reply to feriha irani at 11:33 Aug-01-2019 (Opening).

Element pitch is the published value (usually 0.6mm or 1.0mm).

Pitch (p) = Element width (e) + gap (g)

If you want actual element width (e), you'll need to find the gap (g) value.

A simple google search would have revealed this information, which was also discussed on this forum in 2015. Why do people not use Google? <sigh>

1
 
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suryakanta Das
Saudi Arabia, Joined Nov 2017, 2

suryakanta Das

Saudi Arabia,
Joined Nov 2017
2
16:55 Aug-01-2019
Re: PAUT
In Reply to Paul Holloway at 16:16 Aug-01-2019 .

Normally pitch is calculated as 90% of probe width considering 10% overlap.
If you want to increase overlap then you can calculate pitch as per that.

1
 
 Reply 
 
Rick Lopez
R & D,
John Deere - Moline Technology Innovation Center, USA, Joined Jul 2011, 191

Rick Lopez

R & D,
John Deere - Moline Technology Innovation Center,
USA,
Joined Jul 2011
191
21:55 Aug-01-2019
Re: PAUT
In Reply to Paul Holloway at 16:16 Aug-01-2019 .

zoom image



Paul,
It isn't clear in original post (to me at least) whether they are referring to width in active or passive direction. Maybe the point of clarification needed (also in Google) is that "elevation" (also called "W-passive") might be the term they see in their probe's information?
Regards
1
 
 Reply 
 
Paul Holloway
Consultant,
Holloway NDT & Engineering Inc , Canada, Joined Apr 2010, 242

Paul Holloway

Consultant,
Holloway NDT & Engineering Inc ,
Canada,
Joined Apr 2010
242
22:29 Aug-01-2019
Re: PAUT
In Reply to Rick Lopez at 21:55 Aug-01-2019 .

Hi Rick,

Maybe it was passive elevation they were looking for (which would actually be more elementary, because there's no calculation necessary, it's right in the catalog specs of any PAUT probe). I suspect since they used the term "calculate" and "single element", they literally meant the "e" value. I think in and of itself, it's not really that useful.

On a related note, ASME Sec V Art. 4 Mandatory Appendix V requires the phased array procedure include the gap dimension. This is ridiculous. I question why this is a requirement in the first place and since it's not a published, available parameter, why it hasn't been deleted yet. The code is updated every 2 years.

Cheers!
P

1
 
 Reply 
 

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