posted on Jun, 27 2003 @ 04:18 PM
An E-bom does a lot of damage to devices that consist of semi-conductors like computerchips. Metaloxide semiconductors like Ge or Si are very
vulnerable to high voltages. Affected devices don' t work anymore like they are supposed to, or don't work at all.
The military uses more and more fiberoptics because fiber is very little affected by EMP. Ongoing research to realise an optical PC helps of course.
You need to prepare for 2 events:
1/the direct EMP-wave and
2/ the indirect consequences.
1/ the first one, World wide cages of Faraday (You know the guy who got struck by lightning) are used to protect important computer systems from
magnetic interference, of which an E-bom is an extreme example. Think of it as a closed cage where current is flowing on the outside and everything
inside is isolated from electric fields so you can barely hear your favourite radioshow. This cage is very expensive and only big companies and
universities have them.
2/ the second one happens 15 minutes later and is much more sneakier. When a EMP hits an electronic device, local magnetic fields are induced and when
those fields eventually collapse they transfer electric currents through the power and communication grid. Itsís like an aftershock. These currents
damage other devices that get in their way. Itís ideal for terrorists who want to attack an well guarded place like a financial or telephone centre by
attacking a connected unguarded building far away. Copper wires used in telephone lines conduct those currents unfortunately very well.
Decreasing magnetic interference inside electronic circuits is done by using a shield made of metal with a very high magnetic conduction which leads
it away. A alloy used is mu-iron.
To be completely safe you put all your devices inside a cage of Faraday and cut all your connections with the outside world like electricity,
telephone, cable, etcÖ Like living back in the stone age.
In Belgium a private company built a EMP-prove bunker where large companies can store their sensitive backups. If I find it, I will post the link to