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July 2003

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From:
"Creswick, Steven" <[log in to unmask]>
Reply To:
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Date:
Thu, 31 Jul 2003 05:52:44 -0400
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Barry,

Besides Sonoscan, Sonix also sells a VERY good acoustic scope for Surface Acoustic Microscopy (SAM).  It is all in the transducer, and software!  (http://www.sonix.com/)

Contamination Studies Labs in Kokomo can do contract SAM work.   
(Contamination Studies Labs
201 E Deffenbaugh St, Kokomo, IN 765-457-8095)
 
Acoustic microscopy comes in very handy when searching for internal delaminations within molded plastic packages (PEMs), underfill voids in flip chips, or BGA's - if you are so inclined, voids in solder/braze joints in high-power packages, internal delaminations in ceramic chip caps, HTCC and LTCC substrates/packages.  With the right transducer one can determine differences in density of various materials based on the differences in the velocity of sound in that media.  

In very general terms, any air gap (delamination or bubble, etc.) will stop the propagation of the incoming signal through the medium, and reflect that incoming signal back towards the transducer - where it is hopefully picked up.  Special techniques need to be employed for analysis of curved surfaces.  Parts with flat/parallel surfaces are ideal - as in the applications described above.

If you were ever looking to buy, I strongly suggest you create some 'spiked' samples and take them to the site and be there for analysis, to determine the ease of working with the equipment and its capability.  You could be surprised just how much different the results can be between systems.

Steven Creswick

Gentex Corporation - A Smarter Vision



-----Original Message-----
From: Barry Gallegos [mailto:[log in to unmask]]
Sent: Wednesday, July 30, 2003 2:34 PM
To: [log in to unmask]
Subject: [TN] SAM Microscope


I have just had a discussion with a fellow associate,
and he is on the hunt for somebody able to do
something called SAM (Scanning Acoustic Microscope.)

Anyone heard of any such animal.

Barry

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