PicDude wrote:
>> You could do Doppler microwave underneath the car without too many
>> problems.
>
> Curious -- is this how an optical mouse works?
> I think I'll go google for a bit...

No.  Modern optical mice have essentially a low resolution camera in them
that looks at the texture and inevitable imperfections of the surface.
Successive frames are compared to determine the distance moved between
frames.


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