RE: Re[2]: [ATM] holographic null test on round robin mirror C

[Dale Eason <atmpob@yahoo.com>]

I thought Steve might post yesterday but since he has
not..

We rotated the mirror 180 degrees Yesterday.  We could
not see any artifacts that rotated.   The largest
artifacts stayed in the same place.  So they are
caused by the mask.   I'm working to make an
adjustable slit for the camera.  The test resolution
depends the slit width. Our current slit does not work
well.  Maybe when we get it under control we will have
better data.  I'm not hopefull.

This test is a little easier to setup that 2D harman
but doing it seems very hard to me.  You have two
slits that must be parallel to one another and must be
adjusted to .004 inch wide.  Then one has to be moved
across the beam will the other is stationary.  The one
that moves has to be positioned on the first side
diffraction image.  It requires a good stage which I
have but a standard Foucault setup would fail.  

On the other hand...
My interferometer data for this mirror does change
sign when rotating 90 degrees.  So it does pass that
test.


Dale Eason

--- Jim Burrows <burrjaw@earthlink.net> wrote:

> At 2005-02-04 09:21 -0600, Steve Koehler wrote:
> 
> >Dale and I are going to do one more thing with this
> test on mirror C.  We're
> >going to rotate the mirror 180 degrees to see if
> any of the asymmetric 
> >features
> >visible at null follow the mirror.
> 
> How about a REALLY tough test: make a test tower
> (the toughest part) so the 
> mirror is resting comfortably horizontal, rotate it
> 90° and see if the 
> primary astigmatism estimates change sign.  Webcam
> Hartmann is still trying 
> to pass that test...
> 
>          -- Jim Burrows
>          -- mailto://burrjaw@earthlink.net
>          -- http://home.earthlink.net/~burrjaw
>          -- Seattle N47.4723 W122.3662 (WGS84) 
> 
> _______________________________________________
> ATM mailing list http://www.atmlist.net/
> 



		
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