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Nikon EFCS & Flash
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mawyatt



Joined: 22 Aug 2013
Posts: 1348
Location: Clearwater

PostPosted: Sat Jan 13, 2018 1:43 pm    Post subject: Reply with quote

Thanks Robert.

The lighting is with 5 strobes with large 7" reflectors, one strobe (XPLOR 600) is used as a simple optical trigger mentioned, so it doesn't contribute much to the image exposure. I use a 40cm cube light tent over the chip and holding fixture, with the lens poking in from the side (horizontal rig) with the strobe scattered around the perimeter and white foam board as reflectors.

All this gives a pretty uniform illumination and I can control the gradient by varying the intensity of the strobes outputs.

Not good enough for chips with solder balls though, I need to go double diffusion or even triple diffusion I've found.

Best,
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Saul



Joined: 31 Jan 2011
Posts: 1083
Location: Naperville, IL USA

PostPosted: Sun Jan 14, 2018 11:46 am    Post subject: Reply with quote

mawyatt wrote:
...Not good enough for chips with solder balls though, I need to go double diffusion or even triple diffusion I've found.


Hi Mike,
Did you try combining it with cross-polarization ?
BR,
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Saul
Studio, horizontal and field setups
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mawyatt



Joined: 22 Aug 2013
Posts: 1348
Location: Clearwater

PostPosted: Sun Jan 14, 2018 3:38 pm    Post subject: Reply with quote

Saul wrote:
mawyatt wrote:
...Not good enough for chips with solder balls though, I need to go double diffusion or even triple diffusion I've found.


Hi Mike,
Did you try combining it with cross-polarization ?
BR,


Hi Saul,

I did some polarization long ago, but not lately. I recall it wasn't too good, but that was early on so might show better results now I have abetter idea of what's going on.

Thanks for the note to remind me, I'll have to get to sometime.

Best,

Mike
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RobertOToole



Joined: 17 Jan 2013
Posts: 641
Location: United States

PostPosted: Mon Jan 15, 2018 4:43 pm    Post subject: Reply with quote

Saul wrote:
mawyatt wrote:
...Not good enough for chips with solder balls though, I need to go double diffusion or even triple diffusion I've found.


Hi Mike,
Did you try combining it with cross-polarization ?
BR,


Good idea Saul!

Robert
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Saul



Joined: 31 Jan 2011
Posts: 1083
Location: Naperville, IL USA

PostPosted: Mon Jan 15, 2018 7:03 pm    Post subject: Reply with quote

mawyatt wrote:
... I did some polarization long ago, but not lately. I recall it wasn't too good, but that was early on so might show better results now I have a better idea of what's going on...


Hi Mike,
My two cents -for the specimen I'm using small cylinder from the polarizing film, surrounded by diffusing material and normal polarizing filter on the objective. That helps with curved surfaces.
If you have complicated case, you can make few stacks for the problematic area, using different positions of the analyzer (while rotating it , you'll see that bright spot will go to the different place on the curved area) and combine them with PS layers.

BR,
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Saul
Studio, horizontal and field setups
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