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Topic: EMP - faraday cage (Read 1 time) previous topic - next topic

doublet

Well, seems like there's another rapture theory out there: in 2013, there will be an electro-magnetic pulse. This will destroy all electrical appliances. This will cause extreme chaos because nobody will know what's happening without internet, tv, radio, newspapers, cars...
Now, my question is: how can I construct a Faraday cage to keep some stuff secure (so I'll be the only one with a still working laptop and, of course, some kind of solar charger for it)? I've found lots of different opinions on things like what metal to use, whether or not to ground it, ..., and I thought maybe the smart people in here would have some tips or ideas.
Sorry God members, I'm an atheist.

Valalvax

I'm assuming you're doing this just for fun, and you don't actually believe the nutjobs?

justjed

I'm more concerned about zombies with HERF guns.
... it is poor civic hygiene to install technologies that could someday
facilitate a police state. -- Bruce Schneier

doublet


I'm assuming you're doing this just for fun, and you don't actually believe the nutjobs?

Indeed :D
Sorry God members, I'm an atheist.

CrossRoads

Just line the walls, windws, and door of the room  you're in with a grounded steel mesh. I don't think it needs to be a real fine mesh either.
Have you seen the ginormous Van De Graaf generator at the Boston/Cambridgde Museum of Science? The  operator works from the inside of what looks like an oversized birdcage, while thousands of volts of electricity sparks & spits & flies around.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

justjed


Have you seen the ginormous Van De Graaf generator at the Boston/Cambridgde Museum of Science? The  operator works from the inside of what looks like an oversized birdcage, while thousands of volts of electricity sparks & spits & flies around.


You mean this gallery? There is video at the site as well.

... it is poor civic hygiene to install technologies that could someday
facilitate a police state. -- Bruce Schneier

focalist

#6
Jun 11, 2011, 07:27 pm Last Edit: Jun 11, 2011, 07:35 pm by focalist Reason: 1
Hehehe About three years ago I took the kids into the MoS..  this Twit of a security guard started giving me a hard time because I was on the balcony section, and to get over the heads of the schoolkids and for angle, I had a camera on my telescopic aluminum monopod.  I was trying to stabilize so I could get some small aperture/long exposure shots of layered arcs.  I had read about the generator, and the MoS was one of the first public landmarks in Boston I hit after I had moved out here from Flatland back in the late 80's.  Tevatron/Fermi is a cool tour, but little gets your attention like a 10' HV arc from a distance of twenty feet.  You can actually feel the shock wave from the air displacement.  It's not sound really, it's a concussive assault on the atmosphere ;)

This dolt starts saying things like "Don't you see the sparks!" at me.. of course the WHOLE THING (the generator and the operator cage) are both within a larger Faraday Cage... I didn't want to argue with the guy.  I did suggest that he LISTEN to the presentation, to understand why my actions were not an issue.  How can you be the guy who stands there and listens to this ten times a day and NEVER ONCE listen to the content?  Content written for (and understood by, mostly) Fourth-Graders?
When the testing is complete there will be... cake.

CrossRoads

That's the one 8)
Very loud when that indoor lightning lets go!
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

liudr

Put your valuable electronics in a metal box and bury it in the back yard  :smiley-mr-green:

Grumpy_Mike

The whole point about a Faraday Cage is that it is not earthed (grounded) there is no need to. Those cages the operator sits in are not. We have something similar but on a smaller scale at the University of Manchester you can get to see it on open days.

liudr


The whole point about a Faraday Cage is that it is not earthed (grounded) there is no need to. Those cages the operator sits in are not. We have something similar but on a smaller scale at the University of Manchester you can get to see it on open days.


Not trying to be the expert here but I think it can be both depending on what you want : shield inside from field coming in or going out:

http://en.wikipedia.org/wiki/Faraday_cage

We have one in our department. It's bolted to the building ground. I'll take a pic next week to share. It looks kind of scary with the over-sized door handle and pitch black without light.

Jack Christensen

And this EMP in 2013 comes from where, exactly?

I'm just sticking with my tinfoil hat.  Remind me though, does the shiny side go in or out?
MCP79411/12 RTC ... "One Million Ohms" ATtiny kit ... available at http://www.tindie.com/stores/JChristensen/

liudr


And this EMP in 2013 comes from where, exactly?

I'm just sticking with my tinfoil hat.  Remind me though, does the shiny side go in or out?


In for cold days, and out for hot days  :smiley-mr-green:

Jack Christensen


In for cold days, and out for hot days  :smiley-mr-green:


Ah!  Of course!  Bahaha!   :D
MCP79411/12 RTC ... "One Million Ohms" ATtiny kit ... available at http://www.tindie.com/stores/JChristensen/

Grumpy_Mike

Quote
but I think it can be both depending on what you want

Connecting to the ground makes no difference. Yes what stops a field geeing in also stops it getting out, that's the symmetry of physics, it is not like a diode.

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