Can anybody give guidance ref. dark field illumination?
Can anybody give guidance ref. dark field illumination?
(OP)
Hi,
Colin here,
Got a real bad problem that I need some guidance to crack. I am looking at semi transparent objects using a digital camera and imaging software. My problem is how to build a system using dark field illumination to hopefully see the inside structure details in a form that they can be captured and subsequently analysed. The info on the net is very theoretical and not really helpful regarding applications. Any help or guidance much appreciated.
Thank you
Colin Bryant
Colin here,
Got a real bad problem that I need some guidance to crack. I am looking at semi transparent objects using a digital camera and imaging software. My problem is how to build a system using dark field illumination to hopefully see the inside structure details in a form that they can be captured and subsequently analysed. The info on the net is very theoretical and not really helpful regarding applications. Any help or guidance much appreciated.
Thank you
Colin Bryant





RE: Can anybody give guidance ref. dark field illumination?
Harold
SW2009 SP2.0 OPW2009 SP0 Win XP Pro 2002 SP3
Dell 690, Xeon 5160 @3.00GHz, 3.25GB RAM
nVidia Quadro FX4600
www.lumenflow.com
RE: Can anybody give guidance ref. dark field illumination?
htt
That's pretty much it. You could probably use side illumination, and that might work well enough.
TTFN
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RE: Can anybody give guidance ref. dark field illumination?
Thanks for coming back. The material in questios
is PMMA supported in a saline bath. Flaw detection
is not required but internal profile viewing of the
object is the whole point of the exercise. I hope this
is of help and that you can make a recommendation that
I can try.
Regards and thanks
Colin Bryant
RE: Can anybody give guidance ref. dark field illumination?
It is difficult to recommend a solution without a lot more detail. I am out out of the office until Tuesday. Call me if you can discuss the problem in more detail (follow the contact info in my signature). Aside from that, IRStuff mentions side illumination (basically edge lighting) and that might work for your application. We had used LEDs to illuminate translucent grain. Blue back lighting and orange front lighting made the surface transparent to the camera but internal "junk" showed up very dark. Try different combinations based on the properties of your material and your camera/software until you can see waht you need to see.
You might try contacting the camera manufacturer or software provider for a lighting recommendation.
Harold
SW2009 SP2.0 OPW2009 SP0 Win XP Pro 2002 SP3
Dell 690, Xeon 5160 @3.00GHz, 3.25GB RAM
nVidia Quadro FX4600
www.lumenflow.com
RE: Can anybody give guidance ref. dark field illumination?