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Ambient electromagnetic energy harvesting drives small electronic devices

7/10/2011 04:42 PM EDT
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MeirG
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re: Ambient electromagnetic energy harvesting drives small electronic devices
MeirG   7/20/2011 6:01:39 PM
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Well, when U say "Why can anyone RF illuminate me or my property without my approval and then stop me...", do you have technical, legal or moral objections? As for Technical barriers, you see, we did nail the culprit... Legally speaking, they do have a license, don't they? As for moral objections, I presume that there is a tacit acceptance of such illumination because we benefit from it without any, or very little, harm: hearing and seeing news and entertainment, receiving phone calls, etc. (You might object to the degree of harm though.) And assuming that, "harvesting" might be considered by many as "stealing" (my legally transmitted energy) or "sabotaging" (my advertisers or my customers interests.)

jlinstrom
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re: Ambient electromagnetic energy harvesting drives small electronic devices
jlinstrom   7/20/2011 5:34:22 PM
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Re MeirG - why can anyone RF illuminate me or my property without my approval and then stop me from using that energy? If this energy harvesting becomes widespread, I'm sure this conversation will become widespread.

DrQuine
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re: Ambient electromagnetic energy harvesting drives small electronic devices
DrQuine   7/19/2011 3:39:08 PM
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In the early 1970's, I recall standing next to our college radio station FM radio antenna where a long fluorescent bulb could be touched to a ground wire and the ambient energy would cause the tube to fully illuminate. It was an impressive effect.

Sanjib.A
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re: Ambient electromagnetic energy harvesting drives small electronic devices
Sanjib.A   7/16/2011 2:33:51 AM
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This sounds like a great idea and a nice story presented by MeriG! I don't know whether wireless power transmission & distribution could be a reality soon, but harvesting the abundant electromagnetic energy could bring a good potential to the energy harvesting portfolio as the research team has demonstrated some good results.

MeirG
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re: Ambient electromagnetic energy harvesting drives small electronic devices
MeirG   7/12/2011 8:39:41 AM
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In the early 60's of the previous century I obtained a summer job in the then government-owned Radio Stations Authority. One day a number of us were sent, equipped with a field-strength meters, to spatially plot the coverage of one of the AM transmitters. Many rural residents complained that they cannot receive the station's signal. We quickly determined that there is a very deep notch in the station's signal strength in a particular direction from the transmitting antenna. Closer scrutiny led us to a house in one village, about four miles from the transmitter. When the premises where searched, it was discovered that each room was permanently illuminated by a florescent lamp fed by a three feet loop of wire. The house owner was in fact very proud: "I discovered it by chance. Isn't that neat?" he said, "No electricity bill!" This guy must be credited with being the first to "harvest" energy from the environment! I am not sure that the radio, TV and cellular towers owners will be thrilled to have their coverage "harvested" away though...

fdunn0
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re: Ambient electromagnetic energy harvesting drives small electronic devices
fdunn0   7/12/2011 3:44:37 AM
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What is the protection from a single high power wideband burst of RF? I can see how somebody that wants to "disarm" this sensor network could easily do so since any lower power rf harvesting antenna would be fuse open and become ineffective.

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