Michael wrote regarding 'RE: [EE] Distance Measurement' on Fri, Feb 17
at 10:12:
> I'm wondering if high frequency vibrations from the engines could
> play havoc with ultrasonics, and water splashing up will certainly
> cause problems with reflections, though those can probably be
> filtered out.
> 
> The only viable alternative I can think of would be a laser based
> system, which would also have problems with water splashes, but at
> least should be more immune to vibration.

The motors shouldn't be vibrating in the ultrasonic range, should
they?  And wouldn't vibration be a bigger problem for a focused beam
of light than a high frequency sound wave?

Just thinking aloud here...

--Danny, hoping for a good suggestion he could also apply to a back-up
sensor on his car
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