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Faraday Cages
Hey All,
I have a 1960's Civil Defense 5 gallon water can I have been wanting to turning into a faraday cage...I'm wanting to do this right, I've been researching this...
For those who don't know what this Faraday cage is, I found a website which gives the best definition that I have found...
Faraday Cage: Faraday cages shield their contents from static electric fields. An electric field is a force field surrounding a charged particle, such as an electron or proton. A Faraday cage is a hollow conductor, in which the charge remains on the external surface of the cage.
In order to understand how Faraday cages work, you need a basic understanding of how electricity operates in conductors. The process is simple: Metal objects, such as an aluminum mesh, are conductors, and have electrons (negatively charged particles) that move around in them. When no electrical charge is present, the conductor has roughly the same number of commingling positive and negative particles.
If an external object with an electrical charge approaches the conductor, the positive and negative particles separate. Electrons with a charge opposite that of the external charge are drawn to that external object. Electrons with the same charge as the external object are repelled and move away from that object. This redistribution of charges is called electrostatic induction.
With the external charged object present, the positive and negative particles wind up on opposite sides of the conductor. The result is an opposing electric field that cancels out the field of the external object's charge inside the metal conductor. The net electric charge inside the aluminum mesh, then, is zero.
And here's the real kicker. Although there's no charge inside the conductor, the opposing electric field does have an important effect-- it shields the interior from exterior static electric charges and also from electromagnetic radiation, like radio waves and microwaves. Therein lies the true value of Faraday cages.
The effectiveness of this shielding varies depending on the cage's construction. Variations in the conductivity of different metals, such as copper or aluminum, affect the cage's function. The size of the holes in the screen or mesh also changes the cage's capabilities and can be adjusted depending on the frequency and wavelength of the electromagnetic radiation you want to exclude from the interior of the cage.
Faraday cages sometimes go by other names. They can be called Faraday shields, RF (radio frequency) cages, or EMF (electromotive force) cages.
People use Faraday cages for a wide array of purposes -- sometimes in esoteric lab settings, other times in common products. Your car, for example, is basically a Faraday cage. It's the cage's effect, not the rubber tires, that protects you in case of a nearby lightning strike.
A lot of buildings act as Faraday cages, too, if only by accident. With their plaster or concrete walls strewn with metal rebar or wire mesh, they often wreak havoc with wireless Internet networks and cellphone signals.
But the shielding effect most often benefits humankind. Microwave ovens reverse the effect, trapping waves within a cage and quickly cooking your food. Screened TV cables help to maintain a crisp, clear image by reducing interference.
Power utility linemen often wear specially made suits that exploit the Faraday cage concept. Within these suits, the linemen can work on high-voltage power lines with a much-reduced risk of electrocution.
Governments can protect vital telecommunications equipment from lightning strikes and other electromagnetic interference by building Faraday cages around them. Science labs at universities and corporations employ advanced Faraday cages to completely exclude all external electric charges and electromagnetic radiation to create a totally neutral testing environment for all sorts of experiments and product development.
Swing by a hospital and you'll find Faraday cages in the form of MRI(magnetic resonance scanning) rooms. MRI scans rely on powerful magnetic fields to create medically useful scans of the human body. MRI rooms must be shielded to prevent stray electromagnetic fields from affecting a patient's diagnostic images.
There are plenty of political and military uses for Faraday cages, too. Politicians may opt to discuss sensitive matters only in shielded rooms that can block out eavesdropping technologies. All modern armed forces depend on electronics for communications and weapons systems, but there's a catch --these systems are vulnerable to aggressiveEMPs (electromagnetic pulses), which can be a result of a solar storm or even man-made EMP attacks. To safeguard critical systems, militaries sometimes use shielded bunkers and vehicles.
It's for this same reason that Faraday cages are a fond subject in the survivalist subculture. These people, who preach self-sufficiency and mistrust of governmental response in the face of human-caused or natural disasters, believe in shielding all important electronics using homemade Faraday cages. In the event that an apocalyptic cataclysm strikes, they'll still have their shortwave radios and other high-tech tools that could be lifesavers.
Even if you're not particularly concerned with doomsday scenarios, Faraday cages likely play a role in your life every day. These cages harness a basic principle of physics and help people all over the planet put those principles to use -- for safety, luxury, convenience and to help further evermore exciting technological advances.
You don't need to spend millions or have a physics degree to make your own Faraday cage. On the Internet, you can find instructions for building a simple cage from common household products.
Thanks to Google search, (NOT bing), and the website http://science.howstuffworks.com/faraday-cage.htm
I'll be looking through Youtube for some videos on how to build a Faraday Cage so we can protect our communication equipment and our Entertainment equipment mostly during a Zombie Outbreak...We all know that if zombies begin to take over there will be someone setting off some form of EMP (Electrical Magnetic Pulse) which will fry all electronics...So building a Faraday Cage will protect our equipment...And lets not forget to place batteries in them also...They be a power source, but they do have a form of electrical charge in them, and lets face it, without batteries, some of our electronics won't be worth a shit...
Anyways, I welcome any help for videos or websites which tell us or show us how to build a Faraday Cage...
I'll keep looking tomorrow...It's freaking 5 in the morning and I'm tired...(LOL)
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Replies to This Discussion
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Permalink Reply by Jessie W. Garrett III on
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I'm going to do a layer type nesting in the 5 gallon can using the insulation foam with the aluminum backing...With everything being wrapped and the aluminum backing foam, I believe everything will be protected...Special since the foam comes in 4X8 sheets, I believe 2 sheets should be enough to double, if not triple to protection...
I'm going to place my communication devices in it along with my little Acer Aspire One mini laptop...And with entertainment probably going to be a big need for, think I'll throw some of my favorite DVD's and portable DVD player along with a bunch of batteries...
I get paid Wednsday, so I'll be getting a couple of sheets of the insulation foam. ANd hope to be videoing the construction of my Faraday cage soon...
The one thing I would like to suggest to everyone is that no matter what you use to build your Faraday Cage, make sure you use the aluminum backing insulting foam...Not only does this add an extra layer of inside insulation, but the foam will also help protect your equipment when being transported to your bunker or camp.
Using the cardboard in between the inside of the walls of your Faraday Cage and turning the aluminum backing to face the cardboard will actually give extra protection just incase the heat for the CME or the EMP burns out the cardboard...
Though I don't know much about EMP's or CME's. But my experience with just regular magnets for science projects, after spinning a magnet around another magnet, with a space of 1/8th of and inch space between them, there was some pretty good heat that came off of them...So I'm figuring if the magnets will have heat coming off of them, then there will be some from the EMP or CME...
But like I said, I'm basing some of my theory off a 10th grade science experiment....(LOL)
I will add one more thing, with the insulating foam, you will be able to pack your Faraday Cage a little tighter...I know when it comes to packing, I packed an entire 3 bedroom house into a 12 foot trailer and a Chevy Suburban...Along with a family of 4...Just make sure that you place pieces of the insulation foam in between everything...I think keeping everything separated with the foam will also help just in case the container's seal was breached in anyway...Just a few little suggestions I can see help everyone build a little better Faraday Cage...
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Permalink Reply by saint.357 on
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very good idea and you may have something with the heat i remember a story way back in the 1800 hundreds when their was a coronal mass ejection it caused some telegraphese in the effected area to actually catch on fire. though that was probably more from the massive energy being forced through the copper wires. like when you plug to much stuff into a cheap extension cord. did that once burned it right in half. electricity's a power thing. my old electronics teacher use to tell us this story from years ago. apparently outside the school one day a squirrel climbing on the power line and hit an ungrounded transformer. the whole thing blew sky high and all they ever found was a chard little skull. he kept in on his desk to remind us not to mess with high voltage. you put enough power through a short and it creates a plasma ball. a miniature sun that just keep bouncing around till it consumes everything it can and burns out. thats why fuse boxes to big builds are housed in huge metal cabinets it's also what happened to that squirrel.
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This video comes from the National Geographics Website and from the Series, Doomsday Preppers...Enjoy
http://channel.nationalgeographic.com/channel/doomsday-preppers/vid...
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Here is a little history on the Faraday Cage for some of you history buffs....This article comes from Wikipedia....
In 1836, Michael Faraday observed that the charge on a charged conductor resided only on its exterior and had no influence on anything enclosed within it. To demonstrate this fact, he built a room coated with metal foil and allowed high-voltage discharges from an electrostatic generator to strike the outside of the room. He used an electroscope to show that there was no electric charge present on the inside of the room's walls.
Although this cage effect has been attributed to Michael Faraday, it was Benjamin Franklinin 1755 who observed the effect by lowering an uncharged cork ball suspended on a silk thread through an opening in an electrically charged metal can. In his words, "the cork was not attracted to the inside of the can as it would have been to the outside, and though it touched the bottom, yet when drawn out it was not found to be electrified (charged) by that touch, as it would have been by touching the outside. The fact is singular." Franklin had discovered the behavior of what we now refer to as a Faraday cage or shield (based on one of Faraday's famous ice pail experiments which duplicated Franklin's cork and can).
Examples of Faraday Cages....
- A microwave oven is an example of a Faraday cage applied for motivation inverse of the usual case: keeping the RF energy within the cage rather than keeping it out. [3]
- Elevators and other rooms with metallic conducting frames famously simulate a Faraday cage effect, leading to a loss of signal and "dead zones" for users of cellular phones, radios, and other electronic devices that require electromagnetic external signals. Small, physical Faraday cages are used by electronics engineers during testing to simulate such an environment to make sure that the device gracefully handles these conditions.
- The shield of a 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.
- A booster bag (shopping bag lined with aluminium foil) acts as a Faraday cage. It is often used by shoplifters to steal RFID-tagged items.[4]
A home-made Faraday cage at the University of Arizona in Dr. Michael Heien's Lab
- Plastic bags that are impregnated with metal are used to enclose electronic toll collection devices during shipment to the customer, so that a toll charge is not registered if the delivery truck carrying the item passes through a toll booth.
- Some electrical linemen wear Faraday suits, which allow them to work on live, high voltage power lines without risk of electrocution. The suit prevents electrical current from flowing through the body, and has no theoretical voltage limit. Linemen have successfully worked even the highest voltage (Kazakhstan's Ekibastuz–Kokshetau line 1150 kV) lines safely.
- 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. Radiographers are trained to identify the characteristic artifacts created on images should the Faraday cage be damaged.
- Faraday cages are routinely used in analytical chemistry to reduce noise while making sensitive measurements. A home-made Faraday cage used for simultaneous microscopy and electrochemistry is shown to the right.
- A Faraday cage was used in 2013 by the Vatican to shield the Sistine Chapel from electronic eavesdropping during the secret papal conclave to elect the next pope.
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I'm not to sure about the heat factor that I mentioned, but according to what I've read so far, that the heat from the center of the blast of an EMP can reach around 5 KV up to 10 KV...Which if I understand it right, that's enough to flash fry a herd of water buffalo in about 20 seconds.
I found this article which also has videos included in it...Maybe this will help us understand the devastation that an EMP can cause...
http://glasstone.blogspot.com/2006/03/emp-radiation-from-nuclear-sp...
As for the heat index from an EMP or CME, I'm not to sure about Kelvin measurements...Science has never been one of my strong points...
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yeah but for an emp to be really effective you have to detonate it high in the atmosphere where it can react with the magnetic field of the earth to increase its power i don't remember all the tech jargon but they did tests a couple decades ago i think they called it star fish where they tested high altitude nuclear detonations and they created huge emps which caused a lot of problems in hawaii radios and phone lines and even lights going crazy luckily this was before the integrated circuit so it didn't cause much harm. but yeah since emps need something as strong as nuke to create them or you know the sun which is nothing but a giant nuke thats constantly going off then it's no wonder it should be hot. but down here on earth the only effect we would see is it burning out thin wires and such and shots in things like power transformer will cause fires but i think the stuff in your Faraday shouldn't heat up.
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Permalink Reply by KOMRAD RHINO☭ on
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if the Faraday Cage blocks em. then i dont see anything in it to heat up at all. but then again i am a gun man not a tech geek. lol.
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it's possible that the cage itself might heat up since it's what the power is through and around. but they've proven that the current will only flow through the outer most edge so even if it does only the skin of the cage should heat up. but if the cage is flawed and some stray electrons get through, which is why you want a tested system, it may cause the items in side of the mini Faradays to heat up
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having read this. i think i will save my time on making them and go buy one from a company that specializes in them. CHANCE is not my middle name. lol.
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don't let it put you off dude trust me a nested Faraday made from simple home supply's is just as good as one your gonna pay upwards of a thousand dollars for. but if your still concerned about a possible failure, or it heating up just bury it in the ground. your not gonna open it till the shit hits the fan anyway so you might as well this will make sure nothing gets to it like kids nose people of pets and basic rule of electricity is it's always trying to find the easy rote to ground. so it will help protect it more, you can trust me I'm a certified electrician. emp's aren't really my expertise but i can tell you it's perfectly safe.
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with my luck running the way it is. i'll fuck it up and ruin my electronics. i think i better just go buy one. lol
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