I would like to build a device measures the EMF in air,it should be sensitive for a wide band (broadband) EMF, And I want it to be able to log into a csv file the time and amplitude of EMF (intensity). I would like to connect a gps device to it so I'll be able to calculate the velocity of my car while measuring EMF.

By the end of the day I want to measure how much power I can gain by driving around high voltage cables.

  1. Can you recommend me an EMF I can use and an Android based board I will be able to connect the EMF to and take logs?
  2. Is it possible to make a draw of the field around me something like that:enter image description here
  3. Is it right to say the energy I can gain in the best case is: $$Energy = Force*distance = q(V\times B) \cdot distance$$

closed as not a real question by Leon Heller, Anindo Ghosh, Dave Tweed, Keelan, Olin Lathrop May 5 '13 at 12:51

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You can meausure the electric field with something called a field mill. That is two electrodes that change orientation by mechanical rotation. Any static field will cause a relative change in voltage between the electrodes as they rotate thru a cycle. This device measures the field in a plane, so you need multiple to measure the 3D field vector at a location.

The rest of what you say makes little sense, particularly the part about gaining energy by driving around near high voltage cables.

  • \$\begingroup\$ How can I use the EMF to charge a battery for example? \$\endgroup\$ – 0x90 May 5 '13 at 3:42
  • \$\begingroup\$ @0x90 - You can't. There isn't enough power there to do anything meaningful. \$\endgroup\$ – Connor Wolf May 5 '13 at 5:44
  • \$\begingroup\$ @ConnorWolf REALLY ? gizmag.com/electromagnetic-harvester/26130 \$\endgroup\$ – 0x90 May 5 '13 at 6:11
  • \$\begingroup\$ @0x90 - Yeah, it's called bullshit. Just like every other free-energy claim. \$\endgroup\$ – Connor Wolf May 5 '13 at 6:17
  • \$\begingroup\$ @ConnorWolf it isn't free energy, I want to test it, in the worst case i'll have fun \$\endgroup\$ – 0x90 May 5 '13 at 6:49

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