[ATM] RE: [atm_free] The zonal Foucault test is free of inherentcorrection bias - some supporting graphs

["Koehler, Steve" <Steve_Koehler@securecomputing.com>]

Mike,

I have digested a bit more of Linfoot, and have reread your writeup.  I think
our simulations show that under ideal conditions Foucault performs very well.  I
was hoping to uncover some problem with it, either due to the mask configuration
(tall openings or the location of the mask openings off the center line), or due
to less than ideal optical conditions (mirror or test stand astigmatism, for
example).  Nothing has turned up in the simulations--Foucault performs nearly
flawlessly.

I have enough data (disagreeing interferometry and Foucault on the same mirror)
to try a different tack.  Now that I have the routine in place to extract
simulated Foucault readings from 2D interferometry data, I plan to compare
simulated Foucault extracted from interferometry, versus actual Foucault.
Perhaps some pattern will emerge from that exercise.

I'm intrigued by your idea that the symmetric zonal profile for the innermost
zones could be a cause of reading error.  Do you have any thoughts on the
mechanism for a reading error?

-- Steve Koehler
   steve_koehler@securecomputing.com


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