Recently, we’ve been getting more and more clients inquiring about Faraday Cages or materials that could be used to build a faraday cage. Therefore, as a company, we feel there is a need to educate our readers, website visitors, and customers on the history of faraday cages, what it is, and what we recommend to use to build a faraday cage.
A Brief History of Faraday Cage
Faraday cage is named after the scientist Michael Faraday, who coined this term in 1836. A Faraday cage is designed with the intention to block electrical fields by having an external electrical field that causes charges within the cage so they cancel each other out. The cages are designed to protect people and other materials from electrical charges, as it conducts current on the outside of the cage. The advantage of having a Faraday cage is that it shields the interior from the exterior electromagnetic radiation. The passing of radio waves within a Faraday cage is attenuated or blocked by the cage. (Reference: https://en.wikipedia.org/wiki/Faraday_cage)
How does a Faraday Cage work?
In order to understand how Faraday cages work, one must understand how electricity operates in conductors. Aluminum mesh is a conductor and has negatively charged particles known as electrons move around in them. The conductor has the same amount of positive and negative particles when there are no electrical charges present.
Electrostatic induction occurs when electrons with a charge opposite of the external charge are drawn to the object. Electrons with the same charge as the external object will repel and move away. With the externally charged object present, the positive and negative particles will be on opposite sides of the conductor. What ends up happening is that the electric field cancels out the field of the external object’s charge inside the conductor. Therefore, in the case of using aluminum, the net charge is zero.
Although there is no charge inside the conductor, the electric field does have an important effect because it shields the interior from exterior electric charges and also from electromagnetic radiation, like radio waves. (References: https://science.howstuffworks.com/faraday-cage.htm)
Where do you find Faraday cages in your everyday lives?
People use Faraday cages for many reasons, they are used in lab settings, or in other products that we are exposed to in everyday lives. For instance, our car is like a Faraday cage. A lot of buildings act as Faraday cages, too, because they are built with concrete walls made with metals or wire mesh, and as a result, it interferes with wireless Internet networks and cell phone signals.
When we heat up our food with a microwave, it traps the radio waves inside the “cage” and allows us to heat up our food. Furthermore, TV cables help to maintain a clear image by reducing interference.
Utility workers wear a suit that resembles a Faraday cage, the suits are made with Faraday materials that allow these men to work on high-voltage power lines while reducing the risk of being electrocuted.
Moreover, governments build Faraday cages around their devices and telecommunication equipment to protect against electromagnetic interference.
Universities and corporations employ Faraday cages to exclude all electric charges and electromagnetic radiation, so a neutral testing environment is possible for conducting experiments and etc...(References: https://science.howstuffworks.com/faraday-cage.htm)
Faraday Cages and EMR Shielding Solutions
At EMR Shielding Solutions, we offer protection “faraday cages” that offer the optimal solution for shielding, reducing electromagnetic radiation and radio waves from coming inside of your bed.