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# Re: [femm] Shielding effectiveness

- To: femm@yahoogroups.com
- Subject: Re: [femm] Shielding effectiveness
- From: David Meeker <dmeeker@foster-miller.com>
- Date: Mon, 30 Apr 2001 09:37:02 -0400
- Organization: Foster-Miller, Inc.
- References: <8f.9eb15a7.281994fc@aol.com> <001d01c0cf06$536b0590$97c6623e@Windows2000>

    Emiliano wrote:

    > My goal is to calculate the reduction of B around the shield, in the
    > external region.
    > In this situation is importan to calculate the currents induced on the
    > shield.
    > ... But the currents depends on the lenght of the wire and the shield ....
    > So, is correct adjust the sigma of the shield in rtelation of its lenght ?
    > For example for 10 mt: sigma_alluminium=sigma_alluminium/10.

    You shouldn't have to "fix" the shield conductivity. Also, you might want to
    take a look at the example from a few weeks ago about eddy currents induced in a
    pipe at http://members.aol.com/_ht_a/gmagnetics/tube/tube.htm . This is pretty
    much the same problem you are looking at.

    Dave Meeker

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    title:Senior Engineer
    adr;quoted-printable:;;350 Second Avenue=0D=0A;Waltham;MA;02451-1196;USA
    fn:David Meeker, Ph.D.
    end:vcard

- References:
  - Re: [femm] Shielding effectiveness
    - From: dcm3c@aol.com
  - Re: [femm] Shielding effectiveness
    - From: "Emiliano" <emiliano.menghi@inwind.it>

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