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Measure very low valued photoresistor

Discussion in 'General Electronics Discussion' started by Darkcom, Aug 16, 2016.

  1. Darkcom

    Darkcom

    2
    0
    Aug 16, 2016
    I am measuring the very low valued resistance of photoresistor, and I found this circuit. Could anyone explain for me, and what is the op amp for this circuit? Thanks alot!
    upload_2016-8-16_14-55-6.png
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,178
    2,690
    Jan 21, 2010
    So do you just want to measure its resistance, or use it to measure illuminance?
     
  3. Darkcom

    Darkcom

    2
    0
    Aug 16, 2016
    HI, Thanks for replying me. I will use it to get the illuminance. Actually, I will measure the incident angle of the light, based on equation I= I(max) * cos(a).
     
  4. BobK

    BobK

    7,607
    1,648
    Jan 5, 2010
    I believe that circuit is for a photodiode, not a photoresistor.

    Bob
     
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