Re: [ATM] RE: [atm_free] The zonal Foucault test

[Jim Burrows <burrjaw@earthlink.net>]

At 2005-03-19 16:44 -0800, Mel Bartels wrote:

>>>Read the last paragraph of Linfoot's treatise and you will note one little
>>>comment on reading the zones where he says that you want to be looking at
>>>the zones as the knife cuts the beam for which side
>>>darkens first.

>Hate 'me too' emails, but this is important enough, so ME TOO !

Hey, another reason to work the Foucault test that way - non-uniform 
illumination.  If you just do a contrast match but the illumination of the 
two mask holes doesn't match, you'll end up with an incorrect 
reading.  Hmm, wonder if Diffract can simulate that - but the simulated 
illumination is, of course, exactly uniform.

         -- Jim Burrows
         -- mailto://burrjaw@earthlink.net
         -- http://home.earthlink.net/~burrjaw
         -- Seattle N47.4723 W122.3662 (WGS84) 

_______________________________________________
ATM mailing list http://www.atmlist.net/