ELF Shielding experiment
ELF Shielding experiment
(OP)
I am doing a shielding experiment, where I wish to shield against frequencies of 0.5 - 100 Hz. For this purpose, I have chosen Mumetal. Unfortunately Mumetals initial permeability has a dependency on frequency, meaning after around 500-600 Hz the initial permeability will plummet towards 1.
My question is this: what if the mumetal is irradiated simultaneously with a high frequency (above 600 Hz) signal, and an ELF (0.5-100 Hz) signal, will the ELF signal be able to penetrate the mumetal (Assuming that it cannot on its own), or will the combination of the two create a new unique signal that does not classify as being between 0.5-100 Hz?
My question is this: what if the mumetal is irradiated simultaneously with a high frequency (above 600 Hz) signal, and an ELF (0.5-100 Hz) signal, will the ELF signal be able to penetrate the mumetal (Assuming that it cannot on its own), or will the combination of the two create a new unique signal that does not classify as being between 0.5-100 Hz?





RE: ELF Shielding experiment
RE: ELF Shielding experiment
What do you mean by "in the absence of nonlinearities"?
RE: ELF Shielding experiment
TTFN (ta ta for now)
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RE: ELF Shielding experiment
As soon as a medium or circuit is nonlinear, then signals begin to mix, generating sums and differences; as well as generating harmonics. In such cases, signals can start to interact.
This fundamental concept is quite useful, even when applied to the sort of question being asked here.
RE: ELF Shielding experiment
RE: ELF Shielding experiment
RE: ELF Shielding experiment
Amplitude also plays a role. It is possible for magnetics to become nonlinear (e.g. saturation of a transformer core).
The description of your experiment didn't seem to be a case where the amplitudes involved would be sufficient to endanger an assumption of linearity. So the concept seemed useful to help quickly answer your original question.
If one frequency did affect the other, then it might be a useful technology with unexpected applications.
RE: ELF Shielding experiment
RE: ELF Shielding experiment
Here's a quick wiki link to an initial explanation:
https://en.wikipedia.org/wiki/Saturation_(magnetic...
RE: ELF Shielding experiment
RE: ELF Shielding experiment
RE: ELF Shielding experiment
RE: ELF Shielding experiment