Re: RE: That encoder stuff.
Posted by
Ian Wright
on 1999-09-23 11:55:06 UTC
Hi Elliot,
I haven't come across the term 'Talbot distance' before - is it a calculable
figure or only arrivable at by experiment? Presumably such a factor would
vary depending on the wavelength of the light source??
Ian
--
Ian W. Wright
Sheffield UK
I haven't come across the term 'Talbot distance' before - is it a calculable
figure or only arrivable at by experiment? Presumably such a factor would
vary depending on the wavelength of the light source??
Ian
--
Ian W. Wright
Sheffield UK
> From: "Elliot Burke" <elliot@...>triangle
>
>
> I'll give it a try.
> The light transmission through two contacted 50% duty gratings is a
> wave. Separate them and it approaches a sine wave, if you have anon-point
> source (LED rather than laser). If spacing is increased to the Talbot
> distance, and you have a LED (extended) source, you'll get the triangle
> wave. Operating at half Talbot spacing gives close to sine wave.
Discussion Thread
Arne Chr. Jorgensen
1999-09-23 02:45:46 UTC
That encoder stuff.
Bertho Boman
1999-09-23 03:54:25 UTC
Re: That encoder stuff.
Elliot Burke
1999-09-23 08:55:48 UTC
RE: That encoder stuff.
Ian Wright
1999-09-23 11:55:06 UTC
Re: RE: That encoder stuff.
stratton@x...
1999-09-23 11:57:35 UTC
Re: RE: That encoder stuff.
Elliot Burke
1999-09-23 23:12:00 UTC
RE:Re: RE: That encoder stuff.
Bertho Boman
1999-09-24 03:26:22 UTC
Re: That encoder stuff.