Re: [CAD_CAM_EDM_DRO] Linear Encoders

I was playing about with some grids printed on transparent film the other
day and this got me to wondering (which, in turn, made me have to lie down
to recover!). If we have a grid of, say, 10 lines to the inch and overlay it
with a tilted moving grid of eleven lines to the inch, is there a vernier
effect?

Ian

--
Ian W. Wright
Sheffield UK

----- Original Message -----
From: Jon Elson <jmelson@...>
Sent: 07 April 2000 20:41
>
> Yes, if you can get the grating at the desired resolution, a piece of
> that grating can be tilted with
> respect to the scale, and it will show moving bands of light and dark,
> by the Moire' principle.
> If you adjust the tilt angle correctly, it will provide bands spaced
> correctly to drive detectors
> in quadrature.
>
> Jon