> Thermal IR cameras are pretty well established as equipment for e.g.
> police helicopters to search for or track people (particularly at night).
I'll bet they're damned expensive though. ;-)
> Sound "images" are common for sonar systems. And ultrasound imaging
> devices, for that matter.
That's not "taking a picture of sound". That's "using sound to take a
picture". If you want to split hairs, anyway... ;-)
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