Ultrasonic sound

[Electronics4you]

Hi All


Is it possible to make a range meter with ultrasonic sound, which can measure over 15 meter, maybe 100?

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[tansis]

Through water yes, but in air , well.. it would take an ear splitting amount of sound, lower frequency waves may work better.

 

[Russlk]

Commercial units measure up to 30 meters, so it should not be too dificult. If you use a parabolic reflector at the target and source, it should be easy.