Re: [ATM] 7 inch sphereical mirror

[Dale Eason <atmpob@yahoo.com>]

This is a good opertunity to verify my idea of how I
got the numbers using OpenFringe and Zernike terms.

Using openfringe I setup the mirror to be 7 inch
diameter and 140 inch ROC.  Then I set all of the
zernike terms to zero.  I turned on the artificial
null as in testing using the Bath at ROC.

The profile graph shows that everywhere the error is
less than .2 on the wavefront the RMS is 1/21 wave.

Does what I did sound right?  The Foucault and Ronchi
simulations show the mirror to be a perfect sphere.

Here is the start test PSF and MTF
http://www.atmlist.net/contrib/atmpob-at-yahoo-dot-com/7inch_sphere.jpg

Dale Eason
--- David Rowe <atmlist@starryridge.com> wrote:

> Howdy,
> 
> At optimum focus I get an RMS diameter of ~ 9
> microns.  A little
> parabolizing would be useful for this mirror.
> 
> -- Dave Rowe
> 
> -----Original Message-----
> From: atm-bounces@atmlist.net
> [mailto:atm-bounces@atmlist.net] On Behalf Of
> Richard
> Sent: Saturday, April 12, 2008 7:00 AM
> To: Dale Eason
> Subject: Re: [ATM] 7 inch sphereical mirror
> 
> Hi Dale,
> 
> Saturday, April 12, 2008, 5:57:08 AM, you wrote:
> 
> DE> using OpenFringe...  The RMS error is 1/21 wave
> and the
> DE> strehl is .92.
> 
> Zemax is considerably less optimistic. On axis spot
> size is 17um RMS
> with a 6.7um Airy disk. On axis Strehl is 0.25.
> 
> -- 
> 
> Best regards,
>   Richard in the UK
> 
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> 
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> 


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