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IR and Photodarlington circuit doubt

Discussion in 'General Electronics Discussion' started by Allwyn, Oct 11, 2015.

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  1. Allwyn

    Allwyn

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    Oct 11, 2015
    concept:
    I use IRL81[LED] as source of 1KHZ 50% duty cycle PWM and OP560A[photodarlington] as Photo detector .
    Connecting source and detector via Fiberoptic with small Portion decladded where different samples to be introduced.
    When samples introduces in the decladed fiber there is a Changes in intensity. This change in intensity changes the Photo Darlington(PD) voltage
    now i need to find the difference between the reference signal 1khz 50% duty cycle PWM and PD.

    prob:
    Need to detect change in amplitude as well as phase.

    i recently posted same question here , i'm getting confuse with the followup's

    Working model: i used 1khz 50% duty cycle(don't get confused as shown in Image 100hz)
    [​IMG]
    [​IMG]
     

    Attached Files:

  2. Arouse1973

    Arouse1973 Adam

    5,165
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    Dec 18, 2013
    I can't see your images? How much of a change in IR levels are you expecting to see? What difference in signal propagation are you expecting to see, I bet it's very small.
    Adam
     
  3. Allwyn

    Allwyn

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    Oct 11, 2015
  4. Arouse1973

    Arouse1973 Adam

    5,165
    1,087
    Dec 18, 2013
    And the difference in timings?
     
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