The common Wheeler equation should apply just fine, although you're expected to know the length of the coil. The bifilar winding will be very tightly coupled, so whatever is connected to it can strongly affect your tuned pickup coil (low-capacitance current-source drive should work well, without influencing the tuning). Also, the coils will have a high capacitive coupling, further complicating analysis.
To calculate coil inductance it is necessary to know length and diameter of the former and number of turns.
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Indeed, to calculate the inductance, the coil length of a solenoidal winding coil is essential.
The closeness of coupling between the primary and bifilar winding may be enough to render the bifilar winding unnecessary. I don't think the designer knows exactly what he is doing. Capacitance between the turns will disappear if one winding vanishes.
Is there any way to calculate the inductance of an AC excited coil?
The specific setup involves a 20T bifilar wound 30mm diameter air core coil. One winding applies a low frequency square wave to stimulate emissions from a reagent placed within the coil. The second winding is capacitively tuned prior to a high gain amp. Hence the need to know the inductance.
Thank you for your reply.
Robin
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