Re: [ATM] LWT setup questions

[Jim Burrows <burrjaw@earthlink.net>]

At 2005-05-21 15:59 -0400, john sherman wrote:

>That tiny light source provides more precision in measuring. The extra 
>diffraction hurts most tests, but the LWT gets easier and better.

It's cute - a Diffract LWT simulation (using a point source) says the wire 
shadows have bright center lines (like "Poisson's bright spot" which was an 
early major victory for the wave theory of light).  The diffraction edge 
effect also lights up the centered zone pin.  John said he's seen this neat 
stuff in actual LWT tests and it does indeed make the test easier and better.

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

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