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Panrock wrote:Sonar imaging. Great!
I was thinking about it as i have a few transducers i got off ebay a while back . it would be interesting if any sound would pass the tiny hole as in light i would expect a large drop in signal ...may be it shouldn't be a hole but a tiny membrane to revibrate the air infront of the nipkow .I think, if using standard 40KHz transducers, you might find the 8mm wavelength a little long for effective directional control by small Nipkow holes. And unless you used a disc made of sound absorbing 'carpet', most of the sound would be reflected straight back.
I was thinking there would have to be some change in the standard nipkow if tried where as in a light one we want it thin as perhaps a sound one a nice thick one or as you say foamy thing layer behind the disk infront of the transducer .
Perhaps it would be no good for close up 3d objects but better at stuff at distance ? but seeing ultra sound imaging it is possible just as you say would a nipkow of some form do the trick would be interesting to try and see what happens.Where ultrasound could come into its own is 'broadcasting' the NBTV signal across a room. Your signal would be inaudible but I recently experimented with audible modulated hf sound for tinnitus suppression. However it proved a blind alley for this and sounded rather like the 'chirruping' line timebase on a 405-line set running off-sync.
Steve O
Harry Dalek wrote:http://reviseomatic.org/help/x-ultrasou ... ceiver.php
Panrock wrote:Harry Dalek wrote:http://reviseomatic.org/help/x-ultrasou ... ceiver.php
Interesting site!
Here's an ultrasonic receiver I built up from a Maplin kit some years ago. It's tunable between 20 and 160 KHz !
Steve O
gary wrote:You should do a sweep - do you have the means of doing so? Just a wave file played out of your PC/laptop will do. If you can't create a wave file I can post one.
gary wrote:Here is a 1Hz - 10kHz sweep Harry
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