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Light modulation frequency detection with photodiode

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Gerr

Electrical
Sep 17, 2008
1
I am looking for applicatin notes for circiuts used to detect light modulation frequency for AC Light sources. These would be low frequency sources such as 60Hz lighting etc... (0-500Hz in general). The basic approach would be to use a photodiode in photovoltaic mode to detect the light and amplify the signal.
The key is to come up with a relatively simple single supply circuit that will have a very wide dynamic range (from very low light levels 1Fl and up) and be stable over a 0-500Hz (or higher).
This requires removing the DC component and amplifying the AC comoponent ultimatly producing a logic level pulse train at the light modulation frequency.
The goal is for everything to run off a single 3.3V supply.
 
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Goto National and Linear and search app notes for 'light sensing' photo transistor, and photodiode.

They will have opamp circuits showing typical schematics.

Keith Cress
kcress -
 
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