RE: [ATM] Mirror Round Robin and some in-house test results

[Dale Eason <atmpob@yahoo.com>]

Scott,
I have also analyzed James's, my own, and the phase
shift interferometery at AZ for mirros B and C.  In
regard to mirror B where James's robo mirror profile
does not match his FringXP data.  I noticed that his
robo did match my robo, my interferometery and the
phase shift analysis average profile.  From that I
discovered a flaw in FringXP.  It does not use enough
Zernike terms for that mirror.  When the extra terms
are added then the profile matches the rest of us.  

I have also analyzed his mirror C data and the robo
profile is very close to my two analyzers.  

The match only happens when you turn off all but the
spherical terms which is as it should be for Foucault
compared to interferometry I think.  That is you are
turning of astig and coma, trefoil, etc. which
Foucault can not see.

So for these two examples robo is not out in left
field.

PS
I also noticed that it also matches the Caustic test
surface profile done on Mirror C.

And by matches I mean within a few nm at each position
along the profile.  My own robo and interferometry are
matching by 5nm or less. 

As I posted earlier I am in the middle of creating a
more detailed report. 

Dale Eason

--- Scott Milligan <starzkey@charter.net> wrote:

> James:
> 
> Yes, very interesting indeed.  A fast look at the
> results suggests that
> reasonable agreement between Foucault and
> interferometry exists when
> astigmatism is not the largest error present
> (cylinder and or trefoil).
> Robo-Foucault seems to be "out in left field",
> however, and optimistic every
> time.  Do you share the same conclusions?
> 
> I will try to find some time over the next few days
> to study the information
> more carefully.
> 
> 
> Scott Milligan
> 
> -----Original Message-----
> From: atm-bounces@atmlist.net
> [mailto:atm-bounces@atmlist.net] On Behalf Of
> James Lerch
> Sent: Monday, January 10, 2005 1:51 PM
> To: atm_free@yahoogroups.com; ATM
> Subject: [ATM] Mirror Round Robin and some in-house
> test results
> 
> Greetings All,
> 
> I've been working on a spread sheet comparing
> various forms of testing.  The
> spread sheet contains the results for 9 different
> optics, ranging from 6
> inch to
> 16 inch.
> 
> The first three optics are the compiled results from
> the ATM mirror round
> robin
> effort.  These three mirrors were tested by a dozen
> ATM's using couder mask
> testing, my Robo Foucault, as well as tested with
> three different
> interferometers, two of which were based on Fringe
> Tracing results, and one
> (Roger Ceragioli's) was based on Phase Shifting
> Results
> 
> The last 6 optics, are amateur optics I've tested
> using both my Robo
> Foucault
> and my Fizeau interferometer.
> 
> I hope you find the results interesting, here's a
> link to the excel file:
> 
>
http://lerch.no-ip.com/atm/Inter/Fringes_and_Foucault/Test_Comp.xls
> 
> Take Care,
> James Lerch
> http://lerch.no-ip.com/atm (My telescope
> construction,testing, and coating
> site)
> 
> "Anything that can happen, will happen" -Stephen
> Pollock from:
> "Particle Physics for Non-Physicists: A Tour of the
> Microcosmos"
> 
> " Press on: nothing in the world can take the place
> of perseverance.
> Talent will not; nothing is more common than
> unsuccessful men with talent.
> Genius will not; unrewarded genius is almost a
> proverb.
> Education will not; the world is full of educated
> derelicts.
> Persistence and determination alone are omnipotent.
> "
>                                                     
>       Calvin Coolidge 
> 
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> 
> 
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> 



		
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