From: "James Lerch" 
To: "ATM List" 
Reply-To: "James Lerch" 


Greetings All,

I spoke with Mr. Royce on Tuesday, and have the following short update:

#1 The interferometry was done with the full aperture
#2 He was concerned the numeric results were influenced negatively by the TDE
#3 He said he would get us the 10th and 12th order Zernike polynomials.

So, in the mean time I've been pondering the idea on how to manually reduce
the interferometry fringes.  We have two images to play with,

#1 the first is the Raw fringe he supplied with the results:
http://lerch.no-ip.com/atm/2ndTry/results/intgram1.JPG (75Kb)

#2 the second is from the synthetic fringe on the test data report here:
http://lerch.no-ip.com/atm/2ndTry/results/testdata.JPG (86Kb)

As I'm told, Image #1 was taken at RoC, and would show straight fringes only for
a SPEHRICAL mirror.   Image #2 is a synthetic fringe produced by the
intereferometry software and a perfect PARABOLIC mirror would show straight fringes.

Not having a good ATM library on hand, I had to rely on common sense to get
me started.  I did ok, until it was time to come up with a pixel scale in
nm :(

Here's what I've come up with so far:
http://lerch.no-ip.com/atm/2ndTry/Synth_Fringe.gif  (12KB)
http://lerch.no-ip.com/atm/2ndTry/Roc_Fringe.gif (15KB)

I had hoped I could come up with a Pixel to nm scale, and then perhaps make a
'Back of the envelop' prediction for at least the one fringe near the
horizontal
axis.  Unfortunately the pixel scale stumped me.....

If anyone has some ideas, I'd be glad to try and implement them!

One last thing, I noticed the two images aren't circular, but more of an
ellipse. I'm sure there's a reason for this, but I can't think of one as I
know Charlie's mirror is pretty near circular (at least in my Robo
images..)

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"

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