Circuit rejects ambient Light


Posted on Mar 3, 2013

In some applications, you need to detect light signals in the presence of background light whose intensity can change by orders of magnitude. The circuit in Figure 1 uses an integrated photodiode/amplifier (OPT201) in conjunction with an integrator that drives two linear optocouplers (TIL300). The optocouplers subtract the background-light-generated current from the current the optical sensor produces. C2 integrates any dc signal present at the output of IC1. The output of IC2 drives two optocouplers, IC3 and IC4.






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