--- David Cary <d.cary+2004@ieee.org> wrote:

> I have a rotating device.

Is it a secret device?

> Currently I measure how fast it rotates using a
> one-pulse-per-revolution optical sensor,
> and then assume that it rotates at a fairly constant
> rate between pulses.

Probably an incorrect assumption.

> 
> Lately I wonder -- is it really rotating at a
> constant rate?

Of course not. Whether you see it or not depends on
your method of measurement and its resolution.

> Or are there significant angular accelerations and
> decelerations between pulses?

Ahh, back to the secret part. What's significant to
you  and your "device"?

Sorry, I'm not being grumpy or anything, you've just
given us no metrics, but want an opinion.

Cheerful regards,

Bob
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