At 09:51 PM 2/4/2005, Martin McCormick wrote:
>         An optical detector on a spirit tube can work.  I have
>done some preliminary experiments with a spirit level tube, light
>source and photo detector.  One can pick up the bubble though my
>initial test setup was crude to say the least.
>
>         I wonder if a capacitance probe against the glass of a spirit
>tube would pick up the difference when the bubble went past or was
>under the probe?  The advantage to that would be that ambient light
>wouldn't interfere with the detector.

That's pretty much how a fluid inclinometer works.


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