Re: Circuit Design Question
I think the best way to do this is convert to a voltage like Joannes said. Depending on your set up, you could run this current through a resistor to ground. If you use a resistor of 10 Ohms, you would get a voltage from 40mV to 200mV.
If you are worried about the op amp integrator saturating too soon, use a smaller resistor (this depends on your op amp voltage, if you have it higher, the less chance of saturation). Also, to get accurate results after each measurement, you should empty the integrator by shorting the capacitor briefly in between measurements.
This is one option. Hope it helps
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Justin
TheModernEngineer.blogspot.com