3 ms·
I'd just be curious of a derivation of how much energy can be transmitted by ultrasonic energy transfer without causing hearing damage due to prolonged exposure
by pkaye 8y ago
I'd just be curious of a derivation of how much energy can be transmitted by ultrasonic energy transfer without causing hearing damage due to prolonged exposure.
- harryh 8y agoIf you google around there has been a decent amount written by physics folks about how ubeam could never work doing exactly this sort of calculation. They show that the amount wouldn't be useful to charge a phone or other similar device. But I guess it might be useful for other things? I dunno.
- pkaye 8y agoFor small IOT devices, the primary benefit would be to charge from a distance (wireless charging) but then the efficiency of the ultrasonic energy transfer will also drop inverse square to the distance. And if the power requirements are low enough, why not live with a lithium batter that will last 5-10 years possibly?
- rdl 8y agoI can think of some specialty environments where batteries fail (due to environmental, temperature, acceleration, etc.) but where energy-transfer would be good. I can separately think of times when RF/induction/etc. wouldn't be good, but ultrasonic might be good.