[ATM] Lateral mirror support test cases measured with interferometer.

[Dale Eason <atmpob@yahoo.com>]

It has taken me a few days but I measured my 16 x 1
plate f5 mirror with my interferometer to see the
difference between lateral supports of two pegs at 45
degrees from the bottom center and only one support at
the bottom center.  I figure that would be the worst
case difference.

The mirror and test stand was measured tilted back
only 5 deg so that would be much more vertical force
on the edge than normal viewing.  The back mirror
support was three 1 x 2 inch pads placed 2 inches from
the outside edge at the top and at the 45 deg peg
locations.

I used a technique of mirror rotations to meaure the
true surface of the mirror and to subtract test stand
induced error.  The true surface was then subtracted
from the different lateral support test cases.

The result was the bottom center only lateral support
induced 1/10 wave PV on the surface of primary astig. 
The two pegs induced none as expected.

I was surprised by how small this actually was for the
1 peg test case.

Dale Eason



 
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