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It's not easy to measure because of the complex impedance. RF instruments, e.g. a network analyser would be required for an exact measurement. Supplementing the primary coil with a capacitor to a resonant circuit should ease a rough estimation from voltages at the primary.
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Ok I got what you said.
One more question.
Since the rate of change in current in the primary coil will produce voltage at the second coil, I think its clear that we need to use a resistance with low value in series with the coil. Isnt that true?
At the secondary coil, parallel resistor with high value should be used to maximize the voltage at the fpga input. Right?
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