Optical
Database
INT-Main
optics
Authors:
M.F.Blanken
Revision
0.1 04/10/00
Revision History
0.1 First draft
Filename: \\Ormnt1\Group_Area\Optics\Master_Documents\INTMain.doc
Owner: M.F.Blanken
Optical specifications *
Mechanical specifications *
Cleaning *
Measurements *
Aligning *
Aluminising *
Reference: *
http://www.ing.iac.es/Astronomy/telescopes/int/index.html
|
Shape |
Working Diameter (mm) |
Asphericity |
Focal length (mm) |
Separation from primary (mm) |
|
|
Primary |
Concave Parabolic |
2540 |
-1 |
7475 |
|
|
Secondary |
Convex Hyperbolic |
531 |
-2.214 |
-1813 |
6017 |
|
Finder: Primary Flat |
Parabolic Flat |
405 135 |
-1 0 |
2104 |
1600 |
|
Focal Station |
Prime (uncorrected) |
Prime (corrected) |
Cassegrain |
TV finder |
|
Focal length (mm) |
7475 |
8357 |
38130 |
2104 |
|
Focal ratio |
F/2.94 |
F/3.29 |
F/15 |
F/16 |
|
Field diameter (arcmin) (no vignetting) (50%vignetting) |
|
40 52 |
20 22 |
15 |
|
Scale (arcsec/mm) |
27.6 |
24.7 |
5.41 |
98 |
|
Diameter of central obstruction (mm) |
914 |
914 |
914 |
139 |
|
Focus/mirror shift (1) |
|
|
27 |
|
1) Movement of focus position for unit movement of secondary mirror
|
Element |
Shape |
Total Diameter (mm) |
Expn. Coef. (1/K) |
Material |
|
Primary |
Concave Parabolic |
2540 |
-0.7x10-6 |
Zerodur |
|
Secondary |
Convex Hyperboloid |
531 |
|
Fused silica |
|
Finder: Primary Flat |
Parabolic Flat |
405 135 |
|
Pyrex Low expn glass |
Dates of snowcleaning
Document of the snowcleaning
Measurements of snowcleaning before and after
Aligning
Documents of the aligning procedures
Dates of last aluminising.
Measurements before and after the aluminising.
D.Carter, U.Sharan & R.E.S.Clegg