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A Faraday cage or Faraday shield is an enclosure used to block some electromagnetic fields. A Faraday shield may be formed by a continuous covering of conductive material, or in the case of a Faraday cage, by a mesh of such materials. Faraday cages are named after scientist Michael Faraday, who first constructed one in 1836. [1]
A conductive enclosure used to block electrostatic fields is also known as a Faraday cage. The amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of holes in a shield to an incident electromagnetic field.
The E-T secondary electron detector can be used in the SEM's back-scattered electron mode by either turning off the Faraday cage or by applying a negative voltage to the Faraday cage. However, better back-scattered electron images come from dedicated BSE detectors rather than from using the E–T detector as a BSE detector.
A Faraday cage WILL block outgoing radiation in the same way as incoming radiation. To block outgoin radiation would not violate Gauss' law since a radiation source inside the cage cannot change the amount of charge inside the cage. The total charge inside a Gauss surface surrounding the cage will not be affected by charge movement inside the cage.
Faraday cage – Enclosure of conductive mesh used to block electric fields; Metal spinning – Metalworking process – Metalworking process used to fabricate thin metal spheres; Oudin coil – Resonant transformer circuit; Tesla coil – Electrical resonant transformer circuit invented by Nikola Tesla
Within two months, Faraday found several other manifestations of electromagnetic induction. For example, he saw transient currents when he quickly slid a bar magnet in and out of a coil of wires, and he generated a steady current by rotating a copper disk near the bar magnet with a sliding electrical lead ("Faraday's disk"). [8]