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Thread: Ultrasonic Sensors
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face BY : Dan Michaels email (remove spam text)



Scott Beatty wrote:

>    I am interested in trying a project with ultrasonic sensors.  How does the
>circuit account for Dopler effect and what is the greatest range that a
>transmitter-sensor pair have?  Also how would other mediums other then air
effect
>the signal (i.e. liquid)?
>

The ckt mentioned is apparently too simple-minded to account
for much of anything. I'm a stranger here myself, and just saw
it in a book on bots. I would suspect, however, that if you
send the amplified pulses straight to a PIC, and actually
determine the frequency of the return pulses, then you could
measure velocities directly. Sounds fairly easy [this is called
"bait" - any nibbles?].

- danM

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