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Faraday cage

  • 27-09-2012 1:16pm
    #1
    Khannie
    Registered Users, Registered Users 2 Posts: 37,485 ✭✭✭✭


    Slightly off the wall question, but would one of these bags like you get for bringing home your frozen stuff from the supermarket work as an effective Faraday cage?

    1264659920059_hz_myalibaba_web16_6716.jpg


Comments

  • #2
    krd
    Banned (with Prison Access) Posts: 3,455 ✭✭✭krd


    I might work - but I wouldn't do anything daredevil with it.


    Electronic components sometimes come in plastic bags with conducting metal in the plastic - this is to act as a Faraday cage to stop static electricity from your hand reaching the component.


    David Blaine's latest trick involves some kind of Faraday cage.


  • #3
    Capt'n Midnight
    Moderators, Recreation & Hobbies Moderators, Science, Health & Environment Moderators, Technology & Internet Moderators Posts: 94,294 Mod ✭✭✭✭Capt'n Midnight


    you also have to consider the skin depth which is frequency dependent
    https://en.wikipedia.org/wiki/Skin_depth


  • #4
    krd
    Banned (with Prison Access) Posts: 3,455 ✭✭✭krd


    Capt'n Midnight wrote: »
    you also have to consider the skin depth which is frequency dependent
    https://en.wikipedia.org/wiki/Skin_depth

    It's the principle induction cookers are based on........And also the reason getting too close to a high tension AC power source might cook you, Faraday cage or no Faraday cage....Your Faraday cage may be involved in the cooking.

    I think someone was killed in recent years, with one of these Tesla (you know what I'm talking about) fairground display things. They had a Faraday cage but something went wrong.

    It's also interesting, in that nearly every person who is struck by lightening survives, but I've read (whether there's any medical basis) that they can experience characteristic problems subsequent to the strike - aside from an absolute terror of thunder and lightening - but they might have received some kind of brain damage.

    Anti-static bags for electronic components are probably quite effective - for protecting electronic components - I wouldn't daredevil with large currents.

    There's also quantum tunnelling to consider - which I don't think is accounted for by the skin effect. I don't think it's considered to be induction either.


  • #5
    Khannie
    Registered Users, Registered Users 2 Posts: 37,485 ✭✭✭✭Khannie


    Tested with a lidl freezer bag. No dice. I think the foil may not be real foil. A worthwhile experiment anyway.


  • #6
    Gurgle
    Closed Accounts Posts: 5,058 ✭✭✭Gurgle


    Khannie wrote: »
    Tested with a lidl freezer bag. No dice. I think the foil may not be real foil. A worthwhile experiment anyway.

    The metal content is very low, the foil is there to reflect heat not for any electrical properties.

    Stick a multimeter on it with the probes a couple of inches apart. If resistance is more than a few ohms then its no good.


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