From: "James Lerch" 
To: , 
Reply-To: "James Lerch" 


----- Original Message -----
From: 
> Howdy,
>
> I've written a VB6 program to manually capture fringe locations.  The program
then >calculates the Zernike coefficients (up to 8th order) from the
fringe location information >by performing a least squares fit.

Dave,

Way to go, and excellent timing!  I won that Ebay auction for the laser
interferometry parts, and I think between myself and our ATM lab, we have
enough
bits to put together an crude interferometry setup.  The only thing were lacking
is software  perhaps you might share your code when the time comes?


>
> My problem is the following:  I can't seem to match these coefficients to the
report that James received from Mr. Royce:
>
> http://lerch.no-ip.com/atm/2ndTry/results/testdata.JPG
>
> One would assume that the second-order coefficients could be changed by the
>operator to present a more easily visualized synthethic interferogram.  In
addition, the >azmuthally symmetric (m=0) terms could also be changed so
that the synthetic >interferogram was referenced to a paraboloidal
surface. Unfortunately, I can't make >the other terms match.  Could it
be that the operator also rotated the frame of reference >of the mirror?
 It's also possible
that my program is not working properly.

When I spoke with Mr. Royce last Tuesday, he mentioned some data about his
Zernike polynomials, I don't know if this will help or not, but here's my
notes from the conversation:

#1 The Zernikes are in a "Peak to Zero" format

#2 Spherical Aberration is contained in the 8th order values (??) and they must
be multiplied by 1.5 to get Peak-Valley Spherical Aberration



> James, can you tell me again what is the RoC of this mirror?  --Thanks.

The RoC is 2829mm, measured with zone 1 (surface radius = 30mm) nulled

With Many Thanks!
James

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