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Nightvision goggles uses ultrasonics to produce image
I figure bats' brains must formulate some kind of image from their sonar so why not a computer chip in a pair of sound based night vision goggles. Great for storming the hostage takers because they see through the smoke grenades in the dark. Also good in the film processing lab. Can your enemies with
nightvision see your goggles' IR emitter's beams? Certainly not if you use the sonar variety. (Unless they are too). Definitely not good for long range, and might set off motion detectors.
we all ready baked this one! [mr2560, Oct 04 2004]
Ben Underwood - Blind, but could see with sound
[MisterQED, May 10 2010]
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||Did you just rent "Daredevil" or something?
||How well do ultrasonic waves travel through air, anyway? It definitely has to be ultrasonic, because normal hearing-range sounds have wavelengths so long that you'd never be able to distinguish any detail.
||This works... 1mm resolution at about 300 Khz... with good amplification you can use natural background noise... but every time you move you get serious bizarre image distortion due to extreme doppler effects. See link for more info.
||huh, this is pretty good...so where's the pastry ? [+]
||If you are interested in this subject, there was a great show on a Ben Underwood (link) who was (sadly I just this moment found out he passed) the best at echolocation.