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ultrasonic distance sensor

M

Matt

Jan 1, 1970
0
is it possible to use an ultrasonic distance sensor inside a tube to
detect water? tube is 1/2" plastic.
 
S

Stanislaw Flatto

Jan 1, 1970
0
Matt said:
is it possible to use an ultrasonic distance sensor inside a tube to
detect water? tube is 1/2" plastic.
Yes, easy as can be, just make sure that the tube is perfectly straight
and the distance is NOT any multiply of 1/4 wave length.
In such conditions you get an ultrasonic musical instrument vibrating to
your tune;^).

Happy music, have fun.

Stanislaw.
 
D

Don Foreman

Jan 1, 1970
0
is it possible to use an ultrasonic distance sensor inside a tube to
detect water? tube is 1/2" plastic.

I would sure think so -- but the reading will be a bit different than
expected because sound travels more slowly in a tube than it does in
free space.

Your round-trip travel time for 150 ft will be almost 300 mS so
you'll surely have to modify the rangefinder elex or build your own.
Putting the transducer down the pipe a ways would eliminate that
issue, just have it a couple of feet above highest expected water
level.

National used to make a little sonar chip, LM1812. It's long obsolete
but it might work nicely if you can find one.

Ultrasonic transducers are easy to find surplus. See, e.g.,
http://www.allelectronics.com/cgi-bin/item/XDR-24/search/ULTRASONIC_TRANSDUCER_.html

You can use the same 'ducer for xmit and receive, just as fishing
sonars do.
 
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