Re: [ATM] Burrows's RC Secondary was Re: Polishing / Figuring Simulator

[Jim Burrows <burrjaw@earthlink.net>]

At 2006-05-09 12:43 -0400, James Lerch wrote:

>As a curious aside, what testing approach(s) did you choose for this convex
>aspheric surface?

I've adapted my 2D webcam Hartmann test to work with a good ol' Hindle 
sphere (RMS = 0.4 nm) which has worked for years as a shaving mirror.  The 
first few tests were run with the mask on the sphere, but I realized that 
could violate the fundamental assumption that the ray paths secondary - 
Hindle overlay the Hindle - secondary return paths.  Now the mask is on the 
secondary, so the Hindle-secondary spacing has to be pretty close to that 
required by Hindle R and secondary's R, b or you get no return at all.

The test processing uses Terebizh's solution (THANKS, Mike Peck) to Born & 
Wolf's RC differential equations.

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

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