It has been stated, that the higher the self resonance of a PI coil, the smaller items can be detected.
Is there any rule of thumb of self resonance frequency vs the size of the target? In other words, I'm looking for a table like: 500 kHz - 1 euro coins, 1 MHz - golden rings, 2 MHz - gold nuggets etc.
All hints appreciated.
Is there any rule of thumb of self resonance frequency vs the size of the target? In other words, I'm looking for a table like: 500 kHz - 1 euro coins, 1 MHz - golden rings, 2 MHz - gold nuggets etc.
All hints appreciated.
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