Hi Chris,

Sorry to be slow responding to you, but there is work to be done.

For information on high resolution stage interferometry go 
to:  http://www.zygo.com/

Select semiconductor, stage position, zmi systems, and read all about it. 
The stuff I usually use is the ZMI 2000 which costs about $9000 per axis. 
All that for one more fuzzy digit.

More later, gotta go.

Dave...


At 12:38 PM 4/6/03 -0400, you wrote:
>In a message dated 06/04/03, dyouden@......... writes:
>
>Hi Dave,
>
>       Thanks for the reply.
>
>>I guess complexity depends upon personal viewpoint to some degree. What 
>>you have described seems complex to me. I have built systems similar to 
>>what you describe and the complexity springs from having to prevent rotation.
>
>
>       ? It is two flat sheets of glass with 4 pairs of small magnets and 
> two strips of metal mounted horizontally on top of the top sheet --- it's 
> not too complicated! I would expect it to be rather easier to prevent 
> rotation than to do the linear positioning.

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)