Hi Vlad - well, the correct answer would be "it depends" (man, Sir Doug is
getting Mt. Dew royalties even during the holidays!). I agree with Syed,
you can use C SAM to locate and characterize PWB delamination with the
selection of proper frequencies and transducers. However, you are correct
in that not all PWB delaminations can be analyzed due to the PWB
construction details of some PWBS. Thicker PWBs with multiple internal
layers due cause reflections that make a delamination analysis impossible.
I have successfully used the C-SAM methodology many times to characterize
PWB delamination but as with all analysis technologies, there are limits.
Happy Holidays
Dave Hillman
Rockwell Collins
[log in to unmask]
"Igoshev, Vladimir" <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
01/02/2009 10:39 AM
Please respond to
TechNet E-Mail Forum <[log in to unmask]>; Please respond to
"Igoshev, Vladimir" <[log in to unmask]>
To
[log in to unmask]
cc
Subject
Re: [TN] PWB Delamination Detection by C-SAM
Well, I don't think so. the higher frequency ones are used for a component
analysis/imaging as the signal won't go deep and will dissipate from any
interface. With all the fibers in a PCB, reflection mode will show feww
too many peaks/echos.
Regards,
Vladimir
----- Original Message -----
From: Syed Ahmad <[log in to unmask]>
To: 'TechNet E-Mail Forum' <[log in to unmask]>; Igoshev, Vladimir
Sent: Fri Jan 02 11:06:21 2009
Subject: RE: [TN] PWB Delamination Detection by C-SAM
With higher frequencies and reflection, exact location within layers could
be determined.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Igoshev, Vladimir
Sent: Friday, January 02, 2009 8:21 AM
To: [log in to unmask]
Subject: Re: [TN] PWB Delamination Detection by C-SAM
Unless it's so thick that no signal will go through it should work. That
is why a low frequency trancducer is used and that is why it should be a
through mode - it won't tell where (which layers) but the location (X:Y)
Vladimir
----- Original Message -----
From: Bev Christian <[log in to unmask]>
To: TechNet E-Mail Forum <[log in to unmask]>; Igoshev, Vladimir
Sent: Fri Jan 02 09:14:24 2009
Subject: RE: [TN] PWB Delamination Detection by C-SAM
But won't it depend on how thick the board is - how many layers? If it
is a really thick one and the delam is in the middle...
Bev
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Igoshev, Vladimir
Sent: Friday, January 02, 2009 9:13 AM
To: [log in to unmask]
Subject: Re: [TN] PWB Delamination Detection by C-SAM
Hi Victor,
Through scan with a low frequency (30 or 15) transducer should be able
to do it.
Regards,
Vladimir
----- Original Message -----
From: TechNet <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Sent: Fri Jan 02 09:09:57 2009
Subject: [TN] PWB Delamination Detection by C-SAM
Fellow TechNetters:
Searching for supporting information on non destructive analysis with
C-SAM to confirm raw board delamination.
Victor,
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