[ATM] RE: Figure Stroke 8 inch

[tomfred@flash.net]

In <410-2200430142163751@earthlink.net>, on 03/13/04
   at 06:16 PM, "Richard Schwartz" <richas@earthlink.net> said:

]We can't analyze your zone readings without knowing the distance of each
]zone from the center of the mirror.

Sorry I should have known that. I used TEX.EXE to produce the mask and run
the numbers. I also put the numbers into FIGURE45.EXE which I feel gives
me a better visualization of the serface.

Here is the output from TEX.

	TEXEREAU MIRROR TEST SHEET

           Comments: 8 inch f6 Tom Fredrickson   Optical diameter: 8
  Readings per zone: 4
Radius of curvature: 95.62
                f/D:  5.98
   Diffraction disc: 0.000157486

 1 ZONE                1          2          3          4
 2 h(x)              2.0000     2.8280     3.4640     4.0000
 3 h(m)              1.0000     2.4140     3.1460     3.7320
 4 hm**2/R           0.0105     0.0609     0.1035     0.1457
 5 hm/4f             0.0052     0.0126     0.0165     0.0195
 6 D1                0.0000     0.0815     0.1010     0.1435
 7 D2                0.0000     0.0670     0.1090     0.1230
 8 D12               0.0000     0.0743     0.1050     0.1333
 9 D12 +  0.0023     0.0023     0.0766     0.1073     0.1356
10 Lamda c          -0.0082     0.0156     0.0038    -0.0101
11 Lamda f * 1e5      -4.26      19.71       6.25     -19.71
12 Lamda f / rho     -0.271      1.252      0.397     -1.252
13 u * 1E6             0.89      -4.12      -1.31       4.12
14 Wavefront           0.00      -2.74      -2.89       0.00
	Reference parabola: y = -0.169619 * x**2 + 2.46132
	passing through (  2.00,  0.00) and (  4.00,  0.00)

Maximum wavefront error = 1 / 7.5 wave at zone 3

Results for individual sets of readings:
	Reading set 1: 1 /  7.7 lamda, Max Trans Abberation=0.84
	Reading set 2: 1 /  3.7 lamda, Max Trans Abberation=2.08
	Reading set 3: 1 /  5.7 lamda, Max Trans Abberation=0.69
	Reading set 4: 1 /  5.6 lamda, Max Trans Abberation=1.30
	Reading set 5: 1 /  4.4 lamda, Max Trans Abberation=1.71
	Reading set 6: 1 /  6.3 lamda, Max Trans Abberation=1.40
	Reading set 7: 1 /  5.2 lamda, Max Trans Abberation=1.71
	Reading set 8: 1 /  4.9 lamda, Max Trans Abberation=1.94

]Generally, move the knife edge outside the focal reading and cut into the
]light cone.   You should see a smooth curve like a ( or a ) for the
]shadow edge when you cut into the light cone.   (Curve depends on how far
]in you cut and which side of the focal region you are on.)   If the curve
]is smooth with no kinks or inflections, and is symmetric about a
]horizontal centerline, you are probably OK.

]Please don't repeat any of this on the ATM list.   It was taught to me by
]Tom Cave before he passed away.  Tom didn't believe in any of that
]computer hocus-pocus, and his mirrors are highly respected.

]. . . Richard

--
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tomfred@flash.net
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