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I would like to know if anyone can help with the following; I am running it a few problems and I am not able to find the formulas that will allow me to prove my idea.

I have a loop of 20 Gauge magnet wire; it's 24 inches by 2 inches. I'm using this as a detector, but i want to detect multiple items. I know that if I tune the coil loop with a RLC circuit that the coil will be detuned when a metal object is introduced inside the loop. but i can not find out what the change would be or what that change would be in relationship to multiples objects of the same size would be.

if someone would be willing to point me in the right direction that would be great; I understand the this is very simuliar to a metal detector or vehicle loop detector but i can't find the formula to allow me to see if this works the way that I think it will....

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# Induction Loop Detector

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