Re: Infrared Radiation Reduction?
- From: Louis Boyd <boyd@xxxxxxxxxxxxxxxxxxxx>
- Date: Thu, 22 Jun 2006 17:04:18 -0700
Loop wrote:
I read an article that infrared radiation cannot pass thruPlexiglass passes well beyond 1 micron where silicon CCD sensitivity ends. There are materials that do a decent job of absorbing infrared in the 700-1000nm range. Google "Schott BG-39 curves" as an example. Interference filters are also available which offer sharper cuttoff wavelengths. Google "hot mirrors". A typical use is in slide projectors to reduce the heating of the film. The glass filters absorb the infrared, hot mirrors reflect it.
plexiglass. If the above is true, could i use any type or
thickness of clear plexiglass in front of a webcam lens
to eliminate all or the majority of infrared radiation?
A filter made by disolving some copper sulfate in water makes a filter which behaves a lot like a BG-39 filter filter and was commonly used for that the same purpose before the glass was available (1980's). To use that you'd need a plastic or glass with parallel windows. Somewhat of a hassle, but I made and used those when I was much younger ;-(
That's the only "common" material I know of which will pass visible light and block near IR. Like the BG-39 filter it has a blueish tint because it does remove some red light too.
.
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- Infrared Radiation Reduction?
- From: Loop
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