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Optically transparent electrical isolation of analog signal
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ricko_uk:
Hi,
what is the best solution to transfer with highest accuracy an electrical signal (0 to 5V - up to 30KHz) from outside a faraday cage to insode it?

1) I was wondering if there are optically-transparent RF-shielding materials and then use some optocoupling means?
2) maybe there are already ready-made module solutions?
3) magnetically couple? but I am looking for a good fidelity signal transfer...

Any suggestions?

Many thanks :)
mikeselectricstuff:
Fibre optic through a metal tube
tggzzz:
Digitise to whatever standard suits you, then use optical fibre to transmit the digits, reconstruct on the outside.

Since you didn't include a latency specification, you could also transfer the digits on paper or magnetic tape :)
ricko_uk:
thank you Mike,
nice idea about the optical fibre.
Any advantages using the tube over cutting a small round hole for the optical fibre into the enclosure? It would still leave that small area open, or am I missing something?

Thank you :)
mikeselectricstuff:
The tube just gives more isolation than a simple hole. bear in mind the hole may need to be big enough to get a connector through
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