Inge,

Can you provide the link to your DropBox file?

I did not observe any problems with sealed, or unsealed, MEMS structures
either, but each of them would have to be reviewed independently, based on
their structures.


Did the aluminum bond pads corrode?

Steve C

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Inge Hernefjord
Sent: Thursday, January 03, 2013 5:37 AM
To: [log in to unmask]
Subject: Re: [TN] Susceptibility of electronics to C-SAM

Hi,
We made a 'deep diving' into the topic decades ago. Several components were
exposed to a range of harmonic vibration packages. All kind of bond wires
were tested, long, short, thin, thick, gold, aluminum. We found that you
must use at least one magnitude more energy to destroy bonds, than what you
use in any Sonar scanning machine. And most important: When we observed
damages, they were not caused because of high amplitude, but rather by LONG
EXPOSURE.  The job was done by Professor Bill Brox.

Most of these works were done many, many years ago. I've such an article on
my DropBox under 'Analysis Methods'. Bad copy, but readable.  The conclusion
was that CSAM is NONDESTRUCTABLE.

Inge



On 2 January 2013 19:59, Stadem, Richard D.
<[log in to unmask]>wrote:

> Just as I suspected. Thank you all for your valuable feedback. 
> Sonoscan also provided me with good information. It appears that C-SAM 
> does not harm components, whether or not the wirebonds are encapsulated.
>
> -----Original Message-----
> From: Guy Ramsey [mailto:[log in to unmask]]
> Sent: Wednesday, January 02, 2013 12:52 PM
> To: 'TechNet E-Mail Forum'; Stadem, Richard D.
> Subject: RE: [TN] Susceptibility of electronics to C-SAM
>
> I would be surprised to read that C-SAM would damage parts.
> Cleaners operate in the thousands of cycles per second. C-SAM in the 
> millions.  Damage is done we harmonics are setup. I would not expect 
> to see damaging harmonics set up at super high frequency.
>
> Guy
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
> Sent: Monday, December 31, 2012 1:48 PM
> To: [log in to unmask]
> Subject: [TN] Susceptibility of electronics to C-SAM
>
> I have a good understanding of the effects of damage that can be 
> caused by cavitation when cleaning electronics using ultrasonic wash 
> with the wrong sweep frequency, but does anyone know if ultrasonic 
> energy from C-SAM analysis can cause damage to electronics? I recently 
> had a customer object when I suggested using Sonoscan to inspect some 
> components for die bond issues, and he said that he had heard ultrasonics
could damage electronics.
> I explained to him that while that was possibly true of ultrasonic 
> cleaning (if not done properly), I had never heard of C-SAM harming 
> electronics.
> Anyone have any experience with damage caused by C-SAM inspection?
>
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