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Recent content by BillCC
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Looking backwards through a holographic diffuser
Our published spec for uniformity is 2% over a 15mm diameter circle, placed about 10mm from the device under test. We're pretty sure the device doesn't notice any non-uniformity since it just accepts photons from about a 60 degree cone. And measuring uniformity is relatively difficult without an...- BillCC
- Post #6
- Forum: Optical systems engineering
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Looking backwards through a holographic diffuser
Thanks for the suggestions. I keep seeing the term "homogenize", but in my limited research, it doesn't seem to be quantifiable, and seems like it was just made up to go along with "milky glass". But it certainly describes what opal glass does even more of than frosted glass, with the...- BillCC
- Post #4
- Forum: Optical systems engineering
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Looking backwards through a holographic diffuser
Our application is illuminating some light sensors while we test their electrical characteristics. Like CMOS image sensors for cell phones. Long ago, we used some plastic holographic diffuser sheeting (unknown specs - but guessed to be 15-30 degree output.) However, the input wasn't collimated...- BillCC
- Thread
- Replies: 7
- Forum: Optical systems engineering
