To: atm{at}shore.net
From: Jim Burrows 
Reply-To: Jim Burrows 


At 00:18 2003-08-04 +0930, John Murray wrote:

>         Well after letting the mirror cool down for a couple of hours I
> decided
>what the hell and took my first set of readings on it. I've used CouderMask
>to give me the sizes of the zones and I have reproduced the output here.

Finally some real quantitative data instead of Ronchi pictures.  You left
out one important fact - fixed- or moving-source.  Assuming moving-source,
here's the Sixtests input file:
-----------------------------
John Murray
      197       46
Foucault
        0
y, mm    X, mm
39.299       0
62.663       0.07
78.967        1.2
92.392        1.5
*
       -1        0
        0
     2013
------------------------------
Sixtests says barely passing, 18.4 nm surface RMS, .838 Strehl ratio,
slightly undercorrected with b = -.982.  Try smoothing out the 25 nm peak
at 70 mm zone and 30 nm valley at 50 mm zone.  Use one of Texereau's
full-lap parabolizing strokes.  When you're this close, best to limit the
spells to a couple of minutes between tests.  Final tests should have more
readings per zone to get a handle on the reading standard deviation, the
next-to-last line in the input file (the 0 here means no available std
dev).  With that input, Sixtests will give a one-sigma confidence bound on
the RMS as a function of the number and spacing of the zones and the
reading accuracy.

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

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