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LED/IR Pair for Leaky Faucet Experiment

  1. Sep 25, 2014 #1
    Hello Friends,

    I'm building a version of the leaky faucet experiment. Which is to say, I'm going to measure the period of water dripping out of a valve. To measure the event of the droplet falling I want to use an LED/IR pair. My understanding is that these things are basically like super sensitive garage door lasers, the things that are at the entrance and if your foot crosses them the garage stops going down, except for me the garage door laser = the LED/IR pair and the foot crossing = the droplet falling.

    I tried to building this experiment a couple years ago with a HeNe laser and a separate photo sensor but the laser was saturating the photo sensor. I'm aware that I could use the same setup and decrease the intensity of the laser but I don't want to do that. What I want is a well built, reasonably priced, LED/IR pair (if that's what it's called) that is intended to be used for something like what I'm doing. I mean, they have to exist right?

    Is there anything coming to your mind that will work? If not is there anywhere you can recommend looking? like maybe some science sensor online store or something. Thanks for any help.

  2. jcsd
  3. Sep 25, 2014 #2


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    Staff: Mentor

    Look at kits to build IR Remote Controls (TX and RX modules). They use modulation to help reject ambient light noise.
  4. Sep 29, 2014 #3
  5. Sep 29, 2014 #4


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    Staff: Mentor

  6. Sep 29, 2014 #5


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    Science Advisor

    Are you trying to observe the threshold of chaos?
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