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== Examples == [[File:Faraday cage over Exhibit Hall windows at the Green Bank Observatory.jpg|thumb|upright|Faraday cage over windows at the [[Green Bank Observatory]]]] * Faraday cages are routinely used in [[analytical chemistry]] to reduce noise while making sensitive measurements. * Faraday cages, more specifically dual paired seam Faraday bags, are often used in digital forensics to prevent remote wiping and alteration of criminal digital evidence. * Faraday bags are portable containers fabricated with metallic materials that are used to contain devices in order to protect them from electromagnetic transmissions for a wide range of applications, from enhancing digital privacy of cell telephones to protecting credit cards from [[RFID skimming]]. * The U.S. and NATO [[Tempest (codename)|Tempest]] standards, and similar standards in other countries, include Faraday cages as part of a broader effort to provide [[emission security]] for computers. * Automobile and airplane passenger compartments are essentially Faraday cages, protecting passengers from electric charges, such as lightning. * Electronic components in automobiles and aircraft use Faraday cages to protect signals from interference. Sensitive components may include wireless door locks, navigation/GPS systems, and [[Lane departure warning system|lane departure warning systems]]. Faraday cages and shields are also critical to vehicle infotainment systems (e.g. radio, Wi-Fi, and GPS display units), which may be designed with the capability to function as critical circuits in emergency situations.<ref>{{Cite web|url=https://ceptech.net/understanding-emi-rfi-shielding-to-manage-interference/|title=Understanding EMI/RFI Shielding to Manage Interference|website=Ceptech|access-date=2020-04-23}}</ref><ref>{{Cite web|url=https://passive-components.eu/reliability-becomes-the-top-concern-in-automotive/|title=Reliability Becomes The Top Concern In Automotive|date=2019-02-12|website=Passive Components Blog|access-date=2020-04-23}}</ref> * A [[booster bag]] (shopping bag lined with [[aluminum foil]]) acts as a Faraday cage. It is often used by shoplifters to steal [[radio-frequency identification|RFID]]-tagged items.<ref>{{Cite news | last=Hamill | first=Sean | title=As Economy Dips, Arrests for Shoplifting Soar| date=22 December 2008 |newspaper=[[The New York Times]] | url=https://www.nytimes.com/2008/12/23/us/23shoplift.html | access-date=12 August 2009}}</ref> Similar containers are used to resist [[RFID skimming]]. * [[Elevator]]s and other rooms with metallic conducting frames and walls simulate a Faraday cage effect, leading to a loss of signal and "dead zones" for users of [[cellular phone]]s, [[radio]]s, and other electronic devices that require external electromagnetic signals. During training, firefighters and other first responders are cautioned that their two-way radios will probably not work inside elevators and to make allowances for that. * Small, physical Faraday cages are used by electronics engineers during equipment testing to simulate such an environment to make sure that the device gracefully handles these conditions.{{citation needed|date=August 2018}} * Properly designed conductive clothing can also form a protective Faraday cage. Some electrical [[lineman (technician)|linemen]] wear Faraday suits, which allow them to work on live, high-voltage power lines without risk of electrocution. The suit prevents electric current from flowing through the body and it has no theoretical voltage limit. Linemen have successfully worked even the highest voltage ([[Ekibastuz–Kokshetau high-voltage line|Kazakhstan's Ekibastuz–Kokshetau line]] 1150 kV) lines safely.{{citation needed|date=March 2014}} * The scan room of a [[magnetic resonance imaging]] (MRI) machine is designed as a Faraday cage. This prevents external RF (radio frequency) signals from being added to data collected from the patient, which would affect the resulting image. Technologists are trained to identify the characteristic artifacts created on images should the Faraday cage be damaged, such as during a [[thunderstorm]]. * A [[microwave oven]] uses a partial Faraday shield (on five of its interior six sides) and a partial Faraday cage, consisting of a wire mesh, on the sixth side (the transparent window), to contain the electromagnetic energy within the oven and to protect the user from exposure to microwave radiation.<ref>{{cite web | title=What keeps microwave radiation from leaking out the oven door? | website=The Straight Dope | date=4 November 2003 | url=https://www.straightdope.com/21343269/what-keeps-microwave-radiation-from-leaking-out-the-oven-door | access-date=1 June 2024}}</ref> * Plastic bags that are impregnated with metal are used to enclose [[electronic toll collection]] devices whenever tolls should not be charged to those devices, such as during transit or when the user is paying cash.{{citation needed|date=December 2017}} * The shield of a [[shielded cable|screened cable]], such as [[USB]] cables or the [[coaxial cable]] used for cable television, protects the internal conductors from external electrical noise and prevents the RF signals from leaking out. * Electronic components in some music instruments, such as in an [[electric guitar]], are protected by Faraday cages made from copper or aluminum foils that protect the instrument's electromagnetic pickups from interference from speakers, amplifiers, stage lights, and other musical equipment. * Some buildings, such as prisons, are constructed as a Faraday cage because they have reasons to block both incoming and outgoing cell phone calls by prisoners.<ref>{{cite magazine |magazine=[[AARP Magazine]] |title=Imperfect System |author=Prose, Mark |issue=April / May 2020 |page=6 |quote=with a Faraday shield would render the phones' transmitting and receiving functions useless}}</ref><ref>{{cite web |url=https://api.ctia.org/wp-content/uploads/2019/04/Contraband-Phone-Task-Force-Status-Report-Combined.pdf |title=REDACTED FOR PUBLIC INSPECTION: Contraband phone task force status report |date=April 26, 2019|publisher=[[CTIA (organization)|CTIA]]}}</ref> The exhibit hall of the [[Green Bank Observatory]] is a Faraday cage to prevent interference with the operations of their [[radio telescope]]s.<ref>{{cite web |title=2023 Science Center Offerings |url=https://greenbankobservatory.org/visit/science-center-schedule/ |publisher=Green Bank Observatory |access-date=6 May 2024}}</ref>
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