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甚低频/极低频(VLF/ELF)的磁场屏蔽  

2015-11-10 00:13:56|  分类: 环境与健康 |  标签: |举报 |字号 订阅

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VLF/ELF MAGNETIC Field Shielding & Mitigation DC~3KHz (1GHz + options)

Global EMC have ‘in depth’ knowledge of magnetic near field shielding materials and techniques. All of our ‘on site’ projects have met performance targets in terms of ‘quiet zone’ specification.

Typical magnetic field shield applications are:

  • Defence from sub-station transformers into public/occupational/domestic areas to (<0.4mT)
  • Defence from high voltage (high tension) power cable/switchgear emanations.
  • Ultra quiet zones for Electron Microscopy rooms, EEG rooms, EIS rooms down to <10nT peak to peak.
  • Protection against disturbance of Earth’s DC field for sensitive equipment (Ferro-dynamic disturbance).

Retro & New Installed Magnetic Field Shielding

retro installed magnetic field shield during the project
retro installed magnetic field shield after the project

Global EMC Installations

Different magnetic field environments demand different magnetic field shielding solutions. Global EMC have historically installed:

  • Multi-layer steel shields
  • Welded plate shields
  • Partial/directional shielding
  • Totally shielded rooms

So as to understand shield material choices Global EMC have carried out comparative material tests:

  • 6mm thick low carbon fully welded 1m3 shielded cube
  • 6mm thick aluminium fully welded 1m3 shielded cube
  • 6mm thick pure/soft iron fully welded 1m3 shielded cube
coil and probe under calibration

Coil and probe under calibration

aluminium shield under test

Aluminium shield under test

tangential field tests

Tangential field tests


pure/soft Iron with radiating coil

Pure/soft Iron with radiating coil

probe prior to insertion into shielded cube

Probe prior to insertion into shielded cube


magnetic field shielding test graph

The findings are not necessarily in line with industry ‘rumours’ on material specification/performance.

DC field 6mm Material thickness, single layer

  • Material A = -0.29dB field loss
  • Material B = -3.58dB field loss
  • Material C = -4.93dB field loss
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