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reducing IR pollution.

Discussion in 'Electronic Basics' started by [email protected], Apr 24, 2007.

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  1. Guest

    Is there a way to reduce the range / effect of a ir based remote
    control.

    I work for a Pay tv company and we have many set top boxes on our
    desks for testing and monitoring. I find that as the STBs and remotes
    are designed to work across many metres, we suffer from reflection. IR
    bouncing all over the place. The STBs are usually controlled within
    10-20 cm of the remote. So I am hoping to filter, attenuate or
    something the IR from the remote. When I have a solution, I will
    implement it in all remotes in the office.

    I have heard of placing colour plastic or paper in the remote,
    experiments have not been very successful.

    I am more than happy to modify the remote by adding a resister in
    series. I can get access to both legs of the LED rather easily without
    pulling it all apart.

    Ideas, thoughts, suggestions?
     
  2. Phil Allison

    Phil Allison Guest



    ** Try a piece of thin black card, like a business card, that is black on
    one or both sides - over the IR LED .

    Reduces the range to under a meter for me.



    ....... Phil
     
  3. Puckdropper

    Puckdropper Guest

    wrote in @y5g2000hsa.googlegroups.com:
    IR is a form of light, and subject to the same behavior as most regular
    light. Therefore, to reduce the range of the IR remote, simply dim the
    light, or reduce where the light can go. I'd try building some basic
    shields out of black construction paper (the color and texture should
    reduce the reflection) and see if it solves your problem.

    Puckdropper
     
  4. Rich Grise

    Rich Grise Guest

    I was going to suggest the black construction paper - it should reduce
    reflections considerably.

    And maybe look into "neutral density filters" which you should be able
    to get the calibration curves on (i.e., attenuation vs. wavelength).

    Good Luck!
    Rich
     
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