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Measure very low valued photoresistor

Darkcom

Aug 16, 2016
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Aug 16, 2016
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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
 

(*steve*)

¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
Moderator
Jan 21, 2010
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So do you just want to measure its resistance, or use it to measure illuminance?
 

Darkcom

Aug 16, 2016
2
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Aug 16, 2016
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So do you just want to measure its resistance, or use it to measure illuminance?
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).
 

BobK

Jan 5, 2010
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I believe that circuit is for a photodiode, not a photoresistor.

Bob
 
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