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Advice needed on ir diode sensor

Discussion in 'Sensors and Actuators' started by satrapus, Jan 10, 2015.

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  1. satrapus

    satrapus

    2
    0
    Jan 10, 2015
    Hi folks,
    I am reverse engineering a chum dispensing machine used for offshore fishing.
    The machine uses a motor and belt to chuck pieces of sardines into the sea at timed intervals.
    There is a ir sensor that registers when a piece is thrown over board.

    Both the implementations I am looking at use a polished piece of stainless steel
    to reflect the ir light back into a sensor in the control box. A fish breaks the
    beam and thus resets the main timer.

    My friend who is helping me thinks we don't need the reflector at all.
    He recons the ir light will reflect off the fish itself and back onto the sensor.

    The distance we need to monitor from the control box in which the ir diode and sensor
    are located is 15cm.

    Any advice as to what course we should take would be much appreciated.

    We are hoping these 2 components will provide the functionality :
    Ir diode - TSAL5100LED INFRAREDM
    Receiver sensor - TSOP34838 PHOTO MODULATOR 38KHz

    Here is what one implementation looks like:
     
    Last edited: Jan 10, 2015
  2. Arouse1973

    Arouse1973 Adam

    5,164
    1,080
    Dec 18, 2013
    It depends on how reflective the fish are. I have never given this any thought before but fish scales reflect light so its possible. Why do you want to change it? You will have to try it to see how it compares.
    Adam
     
  3. satrapus

    satrapus

    2
    0
    Jan 10, 2015
    The average sardine is small (12-15cm) and will be cut into 3-4 pieces.
    Once cut there's blood n guts all over the place.
    I think I will need to let my friend discover the smelly way that using a reflector is the way to go.
    Thanks
     
  4. Arouse1973

    Arouse1973 Adam

    5,164
    1,080
    Dec 18, 2013
    Lol. Yep not very reflective then. I would stick to what you have.
    Adam
     
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