2 coils in one? Double the depth?

13 Oct

Being fascinated by the number eight shape design of metal detector like Nexus, there is a thought which crossed my mind, could the two overlapping loops be providing double the depth search of a regular, singular loop?
What about coils like Detech? They seem to also be two overlapping loops.

Comparing a Nexus metal detector search coil against a Detech search coil of the same size, the Nexus coil goes deeper and I was unsure why.  After some research it came to my attention that the Nexus search coils has a larger search window inbetween the two overlapping loops, being perfectly circular, where Detech coils, though offering extra depth in comparison to the regular single circular loops, have a smaller search window due to the shape being more eliptical than round.

 

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