The Mirror Cell - PLOP simulations with a central obstruction of 75mm (equal forces on the support points)

Computation with a true central obstruction of 75mm, allowing for refocus shift

Contents

Central obstruction: 75mm

Part overview of 'p6_1_5' cell Part overview of 'p6_1_5_45' cell Part overview of 'p6_autocell' cell Part overview of 'p7_1_6' cell Part overview of 'p8_1_7' cell Part overview of 'p9_1_8' cell Part overview of 'p9_autocell' cell Part overview of 'p11_1_10' cell Part overview of 'p12b' cell Part overview of 'p12c' cell Part overview of 'p12d' cell Part overview of 'p12e' cell Part overview of 'p12f' cell Part overview of 'p12i' cell Part overview of 'p18_autocell' cell

By taking into account only the diameter of the secondary mirror (minor axis), the most optimistic values are generated. This does however not guarantee a fully illuminated field.

A better approach is to simulate with an effective central obstruction, computed as the real central obstruction minus the largest possible field stop (2"). If this yields a negative value, then compute with zero central obstruction.

The values in the following simulations have been computed while allowing for defocus compensation. This means that the computed designs will allow a different focus when pointed near horizon or near the zenit. Practically this means that you will need to refocus when aiming at different heights.

6 Points Cell: p6_1_5

Color plot Cell overview Support points
Color plot of 'p6_1_5' cell Part overview of 'p6_1_5' cell Support points of 'p6_1_5' cell
Contour plot PLOP data
Contour plot of 'p6_1_5' cell
  1. Input file for PLOP: p6_1_5.gr (text file)
  2. Output of PLOP:
    • Parameter r: 0.666667
    • Visible P-V Error: 3.39547e-05 mm
    • Visible RMS Error: 7.5111e-06 mm
    • Refocus change in focal length: -0.0869295 mm
  3. Cell parts: Part 1 Part 2 Part 3

6 Points Cell: p6_1_5_45

Color plot Cell overview Support points
Color plot of 'p6_1_5_45' cell Part overview of 'p6_1_5_45' cell Support points of 'p6_1_5_45' cell
Contour plot PLOP data
Contour plot of 'p6_1_5_45' cell
  1. Input file for PLOP: p6_1_5.gr (text file)
  2. Output of PLOP:
    • Parameter r: 0.666667
    • Visible P-V Error: 3.34746e-05 mm
    • Visible RMS Error: 7.43428e-06 mm
    • Refocus change in focal length: -0.0869291 mm
  3. Cell parts: Part 1 Part 2 Part 3

6 Points Cell (with PLOP's autocell): p6_autocell

Color plot Cell overview Support points
Color plot of 'p6_autocell' cell Part overview of 'p6_autocell' cell Support points of 'p6_autocell' cell
Contour plot PLOP data
Contour plot of 'p6_autocell' cell
  1. Input file for PLOP: p6_autocell.gr (text file)
  2. Output of PLOP:
    • Parameter rel-support-radii[0]: 0.5926
    • Visible P-V Error: 2.25765e-05 mm
    • Visible RMS Error: 4.01092e-06 mm
    • Refocus change in focal length: -0.0922544 mm
  3. Cell parts: Part 1

7 Points Cell: p7_1_6

Color plot Cell overview Support points
Color plot of 'p7_1_6' cell Part overview of 'p7_1_6' cell Support points of 'p7_1_6' cell
Contour plot PLOP data
Contour plot of 'p7_1_6' cell
  1. Input file for PLOP: p7_1_6.gr (text file)
  2. Output of PLOP:
    • Parameter r: 0.693695
    • Visual P-V Error: 1.72667e-05 mm
    • Visual RMS Error: 3.98066e-06 mm
    • Refocus change in focal length: -0.0562624 mm
  3. Cell parts: Part 1 Part 2 Part 3

Cell p8_1_7

Color plot Cell overview Support points
Color plot of 'p8_1_7' cell Part overview of 'p8_1_7' cell Support points of 'p8_1_7' cell
Contour plot PLOP data
Contour plot of 'p8_1_7' cell
  1. Input file for PLOP: p8_1_7.gr (text file)
  2. Output of PLOP:
    • r: 0.691869 mm
    • err: 2.27135e-06 mm
    • Visible P-V Error: 1.09646e-05 mm
    • Visible RMS Error: 2.27135e-06 mm
    • Refocus change in focal length: -0.0506169 mm
  3. Cell parts: Part 1 Part 2 Part 3

9 Points Cell: p9_1_8

Color plot Cell overview Support points
Color plot of 'p9_1_8' cell Part overview of 'p9_1_8' cell Support points of 'p9_1_8' cell
Contour plot PLOP data
Contour plot of 'p9_1_8' cell
  1. Input file for PLOP: p9_1_8.gr (text file)
  2. Output of PLOP:
    • Parameter r: 0.682219
    • Visual P-V Error: 1.02138e-05 mm
    • Visual RMS Error: 1.62526e-06 mm
    • Refocus change in focal length: -0.0531049 mm
  3. Cell parts: Part 1 Part 2 Part 3

9 Points Cell (with PLOP's autocell): p9_autocell

Color plot Cell overview Support points
Color plot of 'p9_autocell' cell Part overview of 'p9_autocell' cell Support points of 'p9_autocell' cell
Contour plot PLOP data
Contour plot of 'p9_autocell' cell
  1. Input file for PLOP: p9_autocell.gr (text file)
  2. Output of PLOP:
    • Parameter r_inner: 0.333333
    • Parameter r_outer: 0.777788
    • Visual P-V Error: 2.55425e-05 mm
    • Visual RMS Error: 5.46643e-06 mm
    • Refocus change in focal length: -0.0393259 mm
  3. Cell parts: Part 1

11 Points Cell: p11_1_10

Color plot Cell overview Support points
Color plot of 'p11_1_10' cell Part overview of 'p11_1_10' cell Support points of 'p11_1_10' cell
Contour plot PLOP data
Contour plot of 'p11_1_10' cell
  1. Input file for PLOP: p11.gr (text file)
  2. Output of PLOP:
    • Parameter rel-support-radii[1]: 0.661798
    • Parameter rel-support-radii[2]: 0.661803
    • Parameter support-angle[1]: 41.3794
    • Parameter support-angle[2]: 77.3789
    • Visible P-V Error: 6.92579e-06 mm
    • Visible RMS Error: 1.35013e-06 mm
    • Refocus change in focal length: -0.0625679 mm
  3. Cell parts: Part 1 Part 2 Part 3 Part 4 Part 5 Part 6 Part 7

12 Points Cell: p12b

Color plot Cell overview Support points
Color plot of 'p12b' cell Part overview of 'p12b' cell Support points of 'p12b' cell
Contour plot PLOP data
Contour plot of 'p12b' cell
  1. Input file for PLOP: p12b.gr (text file)
  2. Output of PLOP:
    • Parameter r0: 0.334088
    • Parameter r1: 0.743573
    • Parameter r2: 0.766565
    • Parameter a1: 42.2921
    • Visible P-V Error: 1.06872e-05 mm
    • Visible RMS Error: 1.76924e-06 mm
    • Refocus change in focal length: -0.0326522 mm
  3. Cell parts: Part 1 Part 2 Part 3

12 Points Cell: p12c

Color plot Cell overview Support points
Color plot of 'p12c' cell Part overview of 'p12c' cell Support points of 'p12c' cell
Contour plot PLOP data
Contour plot of 'p12c' cell
  1. Input file for PLOP: p12c.gr (text file)
  2. Output of PLOP:
    • Parameter r0: 0.334088
    • Parameter r1: 0.743573
    • Parameter r2: 0.766565
    • Parameter a1: 42.2921
    • Visible P-V Error: 1.06872e-05 mm
    • Visible RMS Error: 1.76924e-06 mm
    • Refocus change in focal length: -0.0326521 mm
  3. Cell parts: Part 1 Part 2 Part 3

12 Points Cell: p12d

Color plot Cell overview Support points
Color plot of 'p12d' cell Part overview of 'p12d' cell Support points of 'p12d' cell
Contour plot PLOP data
Contour plot of 'p12d' cell
  1. Input file for PLOP: p12d.gr (text file)
  2. Output of PLOP:
    • Parameter r0: 0.398838
    • Parameter r1: 0.763845
    • Parameter r2: 0.789815
    • Visible P-V Error: 1.03615e-05 mm
    • Visible RMS Error: 2.10656e-06 mm
    • Refocus change in focal length: -0.0313384 mm
  3. Cell parts: Part 1 Part 2

12 Points Cell: p12e

Color plot Cell overview Support points
Color plot of 'p12e' cell Part overview of 'p12e' cell Support points of 'p12e' cell
Contour plot PLOP data
Contour plot of 'p12e' cell
  1. Input file for PLOP: p12e.gr (text file)
  2. Output of PLOP:
    • Parameter r0: 0.398842
    • Parameter r1: 0.763828
    • Parameter r2: 0.789803
    • Visible P-V Error: 1.03621e-05 mm
    • Visible RMS Error: 2.10656e-06 mm
    • Refocus change in focal length: -0.0313465 mm
  3. Cell parts: Part 1 Part 2 Part 3 Part 4 Part 5 Part 6

12 Points Cell: p12f

Color plot Cell overview Support points
Color plot of 'p12f' cell Part overview of 'p12f' cell Support points of 'p12f' cell
Contour plot PLOP data
Contour plot of 'p12f' cell
  1. Input file for PLOP: p12f.gr (text file)
  2. Output of PLOP:
    • Parameter r0: 0.337615
    • Parameter r1: 0.757378
    • Parameter r2: 0.731176
    • Parameter a1: 22.1532
    • Visible P-V Error: 1.03911e-05 mm
    • Visible RMS Error: 1.69952e-06 mm
    • Refocus change in focal length: -0.0339263 mm
  3. Cell parts: Part 1 Part 2 Part 3

12 Points Cell: p12i

Color plot Cell overview Support points
Color plot of 'p12i' cell Part overview of 'p12i' cell Support points of 'p12i' cell
Contour plot PLOP data
Contour plot of 'p12i' cell
  1. Input file for PLOP: p12i.gr (text file)
  2. Output of PLOP:
    • Parameter r0: 0.409088
    • Parameter r1: 0.7627
    • Parameter a1: 23.6154
    • Visible P-V Error: 9.73386e-06 mm
    • Visible RMS Error: 1.81218e-06 mm
    • Refocus change in focal length: -0.0374393 mm
  3. Cell parts: Part 1 Part 2

18 Points Cell (with PLOP's autocell): p18_autocell

Color plot Cell overview Support points
Color plot of 'p18_autocell' cell Part overview of 'p18_autocell' cell Support points of 'p18_autocell' cell
Contour plot PLOP data
Contour plot of 'p18_autocell' cell
  1. Input file for PLOP: p18_autocell.gr (text file)
  2. Output of PLOP:
    • Parameter rel-support-radii[0]: 0.396199
    • Parameter rel-support-radii[1]: 0.797285
    • Visible P-V Error: 4.35824e-06 mm
    • Visible RMS Error: 7.29162e-07 mm
    • Refocus change in focal length: -0.0191484 mm
  3. Cell parts: Part 1 Part 2

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