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They have a video you can watch

• saeranv 9y ago
  The video doesn't really explain what they're doing though. Can anyone explain how they're visualizing the EM fields here?
  • mmcconnell1618 9y ago
    It looks like they have a metering device that glows different colors based on the strength of the field detected. They then appear to be systematically moving the meter across a grid with time lapse photography. The lights photographed from different positions are blended together to create a voxel-like view of the field.
    • saeranv 9y ago
      Thanks for explaining that makes sense. What kind of metering device will glow based on these kinds of EM fields?