The Faraday Cage Heartsound Audio

 A Faraday cage or Faraday shield is an enclosure used to block some electromagnetic fields. A Faraday shied may be formed by a continuous covering of conductive material, or in the case of a Faraday cage, by a mesh of such materials. The main function of a Faraday cage is to act as a protective enclosure, preventing certain types of electromagnetic radiation from reaching the inside (or from the inside to the external environment). 

Faraday cages work because an external electrical field will cause the electric charges within the cage's conducting material to be distributed in a way that cancels out the field's effect inside the cage. This phenomenon can be used to protect sensitive electronic equipment (for example RF receivers) for external radio frequency interference (RFI) often used to test or align the device. Faraday cages are also used to protect people and equipment against electric currents such as lightning strikes and electrostatic discharges, because the cage conducts electrical current around the outside of the enclosed space and none passed through the interior.

In 1754, Jean Antoine Nollet published an account of the cage effects in his Lecons de Physique Experimentale. In 1755, Ben Franklin observed the effect by lowering an uncharged cork ball suspended on a silk thread through an opening in an electrically charged metal can. The behavior is that of a Faraday cage or shield. In 1836, Michael Faraday observed that the excess charge on a charged conductor desided only on it's exterior and had no influence on anything enclosed within in. To demonstrate this, he built a room coated in metal foil and allowed high voltage charges from an electrostatic generator to strike outside the room. He used an electroscope to show that there was no electric charge present on the inside of the room walls.

Faraday cages are routinely used in analytical chemistry to reduce noise while making sensitive measurements. Automobile and airplane compartments are essentially Faraday cages, protecting passengers from electric charges, such as lightning. Small, physical cages are used by electronic engineers during equipment testing to stimulate such an environment to make sure that the device gracefully handles these conditions.  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. 


<3 Hugs,

Krissy

www.heartsoundaudio.com


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