Faraday cage

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Faraday cage

[′far·ə‚dā ‚kāj]
(electricity)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

Faraday cage

A shielded enclosure used to block electromagnetic fields from reaching its interior. However, a compass does work inside a Faraday cage because the cage does not block the earth's magnetic field. Constructed of a metal mesh, current is conducted on the cage itself. It was invented by physicist Michael Faraday in 1836.

Buildings that house sensitive test equipment and hospital MRI rooms may be enclosed in Faraday cages. They are also used to prevent eavesdropping. Home-made cages are made by wrapping a cardboard box with aluminum foil or using metal garbage cans or anti-static bags. Items placed inside can also be wrapped with layers of aluminum foil. See air gapped, EMP and Farad.


Temporary Shielded Enclosures
Providing the type of shielding that Faraday cages offer, these portable tents eliminate electromagnetic interference (EMI). They are also easy to set up and tear down. (Images courtesy of Select Fabricators, top, and TekBox Digital Solutions, bottom.)


Temporary Shielded Enclosures
Providing the type of shielding that Faraday cages offer, these portable tents eliminate electromagnetic interference (EMI). They are also easy to set up and tear down. (Images courtesy of Select Fabricators, top, and TekBox Digital Solutions, bottom.)
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References in periodicals archive ?
Full marks to the chap in Brighton who has covered the walls of his bar in tin foil to create a Faraday cage to block mobile phone signals.
The only thing we have in place now is PEP AM stations across the country where transmitters are housed in EMP-proof Faraday cages with thousands of gallons of fuel underground to power them for weeks.
Developing quantum computers requires specific conditions and it has been reportedly alleged that the agency carries out some of its research in large, shielded rooms known as Faraday cages, which are designed to prevent electromagnetic energy from coming in or out.
With talk about the potential event of a large solar flare directly hitting Earth, some high-tech engineering types are discussing the merits of using homemade Faraday cages to protect electronics and power-generating equipment and vehicle computers.
Faraday cages have almost ideal performance for electrostatic fields, work very well for electromagnetic fields but with some qualifications, and have little effect on low-frequency magnetic fields.