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Simple circuit measures relative intensity of two light sources
Question: Can I measure the difference between two light sources with an instrumentation amplifier?
Answer: Yes, by replacing the main setting resistor of an instrumentation amplifier with two photoresistors.
In many lighting applications, measuring the relative intensity of two light sources is more important than measuring their individual intensity. This ensures that two light sources shine with the same intensity. For example, it is helpful to compare the brightness inside a control room (Room 1) to a second room (Room 2) in the same building so the adjustment can be made any time of day as well as night, or, if you have a production system, you might want to ensure that the bright light conditions do not change.