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January 2009

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Subject:
From:
"Igoshev, Vladimir" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Igoshev, Vladimir
Date:
Fri, 2 Jan 2009 12:26:38 -0500
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Hi Dave,



You obviously have had more luck with that :-), as I've never been able to see any reliable echos from if a PWB has fibers and it's not just double sided. I'd appreciate if you can share the "tricks" you used.



Vladimir



________________________________



From: [log in to unmask] 

To: TechNet E-Mail Forum ; Igoshev, Vladimir 

Cc: [log in to unmask] 

Sent: Fri Jan 02 12:11:26 2009

Subject: Re: [TN] PWB Delamination Detection by C-SAM 







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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