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Material transmissive to visible light but blocks IR of zappers ?

Discussion in 'Electronic Repair' started by N_Cook, May 24, 2012.

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  1. N_Cook

    N_Cook Guest

    Or at least translucent to visible. Hopelessly undiscriminating IR encoder &
    decoder on a piece of kit but need to see the LED segment display , which
    inconveniently has the IR Rx within it.
    I've tried loads of normal materials like polythene,perspex, glass, mica,
    silicone rubber.
    I know black polythene will transmit the IR of PIR units and block visible
    but there is more seperation of f there
  2. Adrian C

    Adrian C Guest

    IR filter from a camera?
  3. N_Cook

    N_Cook Guest

    I just tried some mylar film , shiney side out but the IR passes and display
    not really visible in normal light
  4. N_Cook

    N_Cook Guest

    Tried some PTFE, and a wodge of those antistatic bags, pink and "smoked
    glass" types - still searching for non-exotic material
  5. N_Cook

    N_Cook Guest

    The only ones I've seen are no more than 10mm square over a CCD chip

    I see the "father" of remote controls died this week.
  6. N_Cook

    N_Cook Guest

    That yellow plastic sheet that was used inside shop windows, that were fully
    in the sun, were anti-UV I suppose
  7. Adrian C

    Adrian C Guest

    Mount a permanently lit IR LED near the sensor. Strike it blind ;-)
  8. Does a "Type A" filter signify anything useful?

    Not in this case. It either converts daylight film for use with 3200K
    lighting, or vice-versa. (Such filters normally have a two-digit number
    starting with 8, followed by a letter.)
  9. how about a "hot mirror" photographic filter?

    they're for old digital cameras that are sensitive to IR.

    they appear to be some sort of dichroic filter and their color changes
    depending on what angle you look at them. They look clear straight on.

    Tiffen made them at some point.
  10. josephkk

    josephkk Guest

    I suppose you could try this:

    mind the wrap

  11. gregz

    gregz Guest


  12. N_Cook

    N_Cook Guest

    I tried that yesterday , using a large jam jar , IR passes but perhaps
    repeat with something square as the IR may have gone round the water
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