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[[File:Faraday cage.gif|thumb|A diagram of how a Faraday cage functions]] | [[File:1210741865 Faraday cage.gif|thumb|A diagram of how a Faraday cage functions]] | ||
A '''Faraday cage''' or '''Faraday shield''' is an enclosure formed by conducting material, or by a mesh of such material. Such an enclosure blocks out external static electrical fields. Faraday cages are named after physicist Michael Faraday, who built one in 1836. | A '''Faraday cage''' or '''Faraday shield''' is an enclosure formed by conducting material, or by a mesh of such material. Such an enclosure blocks out external static electrical fields. Faraday cages are named after physicist Michael Faraday, who built one in 1836. | ||
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To a large degree, Faraday cages also shield the interior from external electromagnetic radiation if the conductor is thick enough and any holes are significantly smaller than the radiation's wavelength. For example, certain test procedures of electronic components or systems that require an environment devoid of electromagnetic interference may be conducted within a so-called screen room. These screen rooms are essentially labs or work areas that are completely enclosed by one or more layers of fine metal mesh or perforated sheet metal. The metal layers are connected to earth ground to dissipate any electric currents generated from the external electromagnetic fields, and thus block a large amount of the electromagnetic interference. This application of Faraday cages is explained under electromagnetic shielding. | To a large degree, Faraday cages also shield the interior from external electromagnetic radiation if the conductor is thick enough and any holes are significantly smaller than the radiation's wavelength. For example, certain test procedures of electronic components or systems that require an environment devoid of electromagnetic interference may be conducted within a so-called screen room. These screen rooms are essentially labs or work areas that are completely enclosed by one or more layers of fine metal mesh or perforated sheet metal. The metal layers are connected to earth ground to dissipate any electric currents generated from the external electromagnetic fields, and thus block a large amount of the electromagnetic interference. This application of Faraday cages is explained under electromagnetic shielding. | ||
The | The [[UNSC stealth cruiser]] ''[[UNSC Point of No Return|Point of No Return]]'' is equipped with a secure, insulated room known informally as [[Odin's Eye]] or "the cage", which functions as a Faraday cage and is as such considered one of the most secure places in human territory.<ref>'''[[Halo: Ghosts of Onyx]]''', ''page 43''</ref> During the [[Battle of Onyx]], [[thermal blanket]]s were used to create a primitive Faraday cage around [[Catherine Elizabeth Halsey|Dr. Catherine Halsey]] when she was working on a [[portable computer|laptop]], to avoid detection by the [[Onyx Sentinels]]' electromagnetic sensors.<ref>'''Halo: Ghosts of Onyx''', ''page 177''</ref> | ||
==Sources== | ==Sources== | ||
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[[Category:Physics]] | [[Category:Physics]] | ||
