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Question about ir led's...

Discussion in 'Electronic Basics' started by [email protected], Jun 18, 2005.

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  1. Guest

    A debate at work prompts this question.

    We have a cluster pack of ir leds that transmit to a circuit card, that
    receives light signal.

    Question.... We have only just started replacing them when signal on
    circuit card makes them suspect of generating a weak signal. I have
    noticed when taking the old cluster of leds out, the led lens is a pink
    hue of color. The replacement clusters led lens is clear.

    I think that since these are powered on all day, for years at a time,
    the ir changes the plastics color. Others think they were a pinkish
    hue to begin with, and new ones are just clear.

    Anyone familiar with this? Can the light generated from the led, which
    is a red color, change the color of the plastic over an extended period
    of time?

    Thank you.

  2. Guest

    Yes, I believe you're on the right track. Several years ago, I worked
    for a firm which made IR scanning devices for touch-screen VDUs.
    Failing IR transmitters were the bane of our lives; many units were
    returned after usage ranging from several months to a few years,
    because of low IR emission.
    IR receiver transistors can suffer from poor sensitivity.
    I used to do comparative tests on both transmitters and receivers prior
    to installation.
  3. redbelly

    redbelly Guest

    Very doubtful. It usually requires uv to degrade plastics (i.e., cause
    discoloration or turning them brittle). If the color has changed, the
    IR had nothing to do with it.

  4. Guest

    Okay... Thank you for your replies..

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