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Noise collectors (i.e. microphones) at noisy places (e.g. airports, busy streets) transduce noise into power for off-grid use. Similar to idea for solar devices (like signboards) but could charge and be useful at more times of the day.
Sound Power table
http://en.wikipedia.org/wiki/Sound_power
How many Watts? [csea, Feb 07 2009]
Models for power from noise
http://www.buffalo.edu/news/12733
Mathematical framework in place [Brasgan, Jul 20 2011]
Energy Harvesting
http://en.wikipedia...i/Energy_harvesting
Note: mechanical vibration rather than atmospheric noise [csea, Jul 20 2011]
[link]
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It would be extremely difficult to harvest any useful amount of power from non-hearing-damage-inducing ambient sound levels (e.g. below 100dbSPL). See [link] for table. |
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Note that table entries are _source_ powers, and do not represent what power could be collected without completely surrounding the source with "microphones" (which are aptly named.) |
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You could get an estimate of the power generated by noise by measuring air temperature rise, but it will generally be too tiny to measure. |
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A non-starter. - But welcome, keep trying! |
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maybe it would work near a large waterfall? perhaps well enough to allow a remote controlled mute to be added so that the tour guide can be heard when necessary. |
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EV ( Electrical vihicle) manufacturers are working on
suspension vibration energy absorption power
recovery systems. It's not a lot of power, but it
helps. |
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//maybe it would work near a large waterfall?// |
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Maybe a watermill would work better under those conditions. |
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The world is working on this:
Mathematical models for coherent energy from noise |
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Well, now that's different. Harvesting mechanical
vibration directly is much more feasible, as the
impedances are much lower. This is a developing
field, so only partly baked. [link] |
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