HELPFUL INFORMATION ABOUT FARADAY CAGE
The Faraday cage, the RF cage, the shield room or the Faraday shield is a kind of sheath used for blocking electromagnetic fields. A Faraday cage structure is constructed of conductive materials or a grid of such materials.
Faraday cage is named after the scientist – Michael Faraday who invented them in 1836. Currently, Faraday Cage is widely applied in information and communication technology, in healthcare, MRI machines (Magnetic Resonance Imaging), cars, aircraft compartments,….
So, why is the Faraday cage applied in many activities of human and how does it work? Why are people and equipment inside protected safely and Is the cage construction complex or not?
If you are in need of building a RF cage in Vietnam, which supplier should you choose? Let’s find out the details in this article with MIGCO.
What is a faraday cage?
Faraday cage is a tool that protects electronic devices from electromagnetic radiation, named after scientist Michael Faraday.
Faraday cage is a type of electronically isolated chamber or a magnetic shield. In addition, it can be simply known as a special container which is capable of preventing electrical signals or waves passing through it.
It works by overlapping conductive layers with non-conductive layers. This creates a barrier to all objects inside and protects them from radiation effects.
Although it sounds complicated, you can actually build a Faraday cage using simple aluminum panels.
THE OPERATION PRINCIPLES OF FARADAY CAGE
The operation principle of a Faraday cage is that the external electric fields make the charges in the conductive material of the cage be distributed. From there, they will cancel the effect of electric fields in the inner part of the cage.
This phenomenon is applied to protect sensitive electronic equipment (e.g. RF receivers) from external radio frequency interference (RFI) that is frequently present during equipment testing or alignment.
Faraday cage is also used to surround RFI-producing equipment, such as radio transmitters so that their radio waves can be prevented from affecting sensitive equipment nearby.
They are also used to protect people and devices against actual currents such as lightning strikes and electrostatic discharges. Because the cage has the effect of conducting current around the outside of the enclosed space and nothing can pass through or affect the inside.
The Faraday cage cannot block stable or changing magnetic fields, such as the magnetic field of the Earth.
For example, some computer testing process of electronic systems requiring an environment free from electromagnetic interference can be performed in a screened faraday room or cage.
These shielding rooms are spaces that are completely enclosed by one or more layers of fine metal mesh or perforated metal sheets.
The metal layers will be grounded to dissipate any electric generated from both external and internal electromagnetic fields. Therefore, they are capable of blocking a large amount of electromagnetic interference.
Faraday cages can effectively block EMP waves from natural phenomena. But, some monitoring equipment, especially of higher frequencies, may be able to penetrate within the cage.