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RE: REFLECTOR: Fuel gauges
Ultrasound should be able to penetrate glass and foam. I have heard that
they use ultrasound to check fluids in large containers.
One of the limitation that Ultrasound has is its inability to penetrate gas
(or air). The diagnostic abilities of ultrasound are limited. It is
excellent at identifying changes in interfacing media (different densities
of material) as long as one of those media is not gas or air, and
outstanding at identifying fluid. Foam of course is full of air and
therefor would not be very penetrable.
It does have certain characteristics that might be useful in this
application under some circumstances, but I am sure there are cheaper and
more appropriate methods. But I have learned to never say never.