From: "mlbrown{at}everstrive.com" 
To: atm{at}shore.net
Reply-To: "mlbrown{at}everstrive.com" 


Slit tester.  Light source is frosted Christmas bulb. Yes, it looked very
smooth in the session before.  I think the lap didn't press well, because
the motion wasn't as smooth as it had been.

=Matt


Original Message:
-----------------
From: Richard Schwartz richas{at}earthlink.net
Date: Thu, 3 Apr 2003 08:54:18 -0800
To: mlbrown{at}everstrive.com
Subject: Re: ATM Am I done yet?


Roughness?
1. describe your tester.  Pinhole, or slit? 2. did it ever look smooth?
3.  if pinhole, what kind of diffuser do you have?

----- Original Message -----
From: "Matthew L. Brown" 
To: 
Sent: Wednesday, April 02, 2003 9:18 PM Subject: ATM Am I done yet?


>
> Mirror: 4.25" f 9.2
>
> The readings now look decent, though I think the center could be lower.
> What I'm worried about is the roughness.  It looks worse to my naked eye,
> though there are more than the usual air currents in my testing room.
>
> Foucault Image (45kB JPEG)
> http://host67.everstrive.com/~mlbrown/ASTRONOMY/KnifeEdge2Apr.jpg
>
> Sixtests says Strehl 0.996 rms 2.7
>
> Tex says 1/19 lambda
>
> Readings (inches)
> zone 1 2 3
> 0.041 0.037 0.067
> 0.035 0.040 0.066
> 0.036 0.045 0.066
> 0.030 0.043 0.067
>
>
> TEXEREAU MIRROR TEST SHEET
>
>             Comments:    Optical diameter: 4.15
>    Readings per zone: 4
> Radius of curvature: 76.62
>                  f/D:  9.23
>     Diffraction disc: 0.000243264
>
>   1 ZONE                1          2          3
>   2 h(x)              1.1980     1.6940     2.0750
>   3 h(m)              0.5990     1.4460     1.8845
>   4 hm**2/R           0.0047     0.0273     0.0464
>   5 hm/4f             0.0039     0.0094     0.0123
>   6 D1                0.0355     0.0412     0.0665
>   7 D2                0.0355     0.0412     0.0665
>   8 D12               0.0355     0.0412     0.0665
>   9 D12 -  0.0189     0.0166     0.0224     0.0476
> 10 Lamda c           0.0119    -0.0049     0.0013
> 11 Lamda f * 1e5       4.66      -4.66       1.54
> 12 Lamda f / rho      0.192     -0.191      0.063
> 13 u * 1E6            -1.22       1.22      -0.40
> 14 Wavefront          -1.12      -0.18       0.00
> Reference parabola: y = -0.233909 * x**2 + 0
> passing through (  0.00,  0.00) and (  2.08,  0.00)
>
> Maximum wavefront error = 1 / 19.3 wave at zone 1
>
> Results for individual sets of readings:
> Reading set 1: 1 / 12.5 lamda, Max Trans Abberation=0.30
> Reading set 2: 1 / 18.8 lamda, Max Trans Abberation=0.20
> Reading set 3: 1 / 21.0 lamda, Max Trans Abberation=0.15
> Reading set 4: 1 / 36.8 lamda, Max Trans Abberation=0.11
>
>
> Do I quit while I'm ahead or try to simultaneously drop the center and
> smooth it out a bit?
> Thanks for the advice.
>
> =Matt
>
>
>
>
>



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