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IR Transparent Projection Screen?

  1. Nov 11, 2010 #1
    Hello,

    Is there such a thing as a projection screen that is transparent to IR? I need to project an image onto a screen (rear-projection), but I also need to send an IR signal through the screen from the side of the human user back to the side with the projector. I think there are metals/metalloids with this property, but those materials obviously don't make good projection screens. Any ideas?

    Thanks,
    Phil
     
  2. jcsd
  3. Nov 11, 2010 #2
    If you are rear projecting you need a transparent screen anyway - something like frosted glass or plastic

    IR remotes are generally around 780-820nm so only 'slightly-infra' red, pretty much anything that transmits red light will also transmit theis level of IR
     
  4. Nov 12, 2010 #3
    I have been informed that the wavelength emitted by the IR LEDs is approximately 950 nm. Does this change things? I would prefer not to let red through if possible.
     
  5. Nov 14, 2010 #4
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