A piece of new data I didn't have earlier - the holographic diffuser used in the past was a 15 degree design, not a 50-80 degree design as the mechanical container should have demanded. Since the incoming light wasn't collimated, and the leds were distributed on a 2" disk about 2" from the...
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...
Thanks for the suggestions. I was trying to avoid the term "homogenize", because 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...
I know a diffuser should be approximately bidirectional, so the "direction" isn't the important part of the question. 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...