'OT IR transmissive plastic'
> I'm building a universal IR receiver/transmitter and I need some plastic
> that is dark in color, yet passes IR easily. Will ordinary red acrylic
> Just what is the right stuff to use?
Most dark tinted hardware store acrylic should pass IR just fine.
However, if you don't trust it, the easy test is to take an IR source
(say, your TV remote) along to the hardware store with you, put
it behind the acrylic in question, and look "through" the acrylic
with a digital camera (camera phones work GREAT for this). If
the substance in question is truly IR transparent you'll see the
LED just fine through it on the camera's display.
An alternative is to use developed 35mm film negatives (without
pictures, of course!) Usually, the returned negatives from a roll
have a couple of inches of exposed film without pictures at the
end. I bet a 1 hour photomat would probably give you all the
film trimmings you can eat if you ask nicely.
Mike Hord wrote:
This only works for COLOR film. Which is why you NEVER use film
for solar filters.
Black frames of Black and white film are totally IR opaque.
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