This paper describes a new optical concept for a telescope. It is essentially made by a single refractive element used in a nontraditional way. The telescope is based upon the internal and multiple reflections over the surfaces of this refractive element. It offers important advantages in the alignment and stability. In this paper, some representative configurations of telescope and a focal adapter based on the same concept are presented, trying to underline the main advantages. A brief in-depth description of the performances is reported.
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Comparison Between a Full-Aperture Telescope and a Solid Obscured One (EX1.0 Exercise)
Diameter [mm]
Area []
Unobscured
100.000
7853.98
Obscuration
84.916
5663.29
Difference
2190.69
Table 2
Evaluation of the Focal Position Shift for Some Common Glasses with Respect to the Entrance Aperture Position Due to Thermal Drop (All Values are Expressed in )
Glass
Mechanical Shrinking
Focal Extraction Variation
Focal Position Variation
Lithosil-Q
BK7
F2
B270
Lithotec-CAF2
Table 3
Comparison of Loss of Efficiency of Solid Telescope Studied Due to the Increasing Numbers of Internal Passages Between S1 and S2
EX1.3 will be treated in the next section.
Referred to the external field.
Global evaluation of internal transmissivity and surfaces reflectivity.
Table 5
Evaluation of the Ring Contribution to the Entrance Aperture with the Increasing of Rings (Values are Percentage of Area)
Ring
1 Ring Solution
2 Rings Solution
3 Rings Solution
4 Rings Solution
5 Rings Solution
1
100.00
69.27
60,84
58.17
57.19
2
30.73
26.99
25.81
25.37
3
12.17
11.64
11.44
4
4.38
4.31
5
1.69
Tables (5)
Table 1
Comparison Between a Full-Aperture Telescope and a Solid Obscured One (EX1.0 Exercise)
Diameter [mm]
Area []
Unobscured
100.000
7853.98
Obscuration
84.916
5663.29
Difference
2190.69
Table 2
Evaluation of the Focal Position Shift for Some Common Glasses with Respect to the Entrance Aperture Position Due to Thermal Drop (All Values are Expressed in )
Glass
Mechanical Shrinking
Focal Extraction Variation
Focal Position Variation
Lithosil-Q
BK7
F2
B270
Lithotec-CAF2
Table 3
Comparison of Loss of Efficiency of Solid Telescope Studied Due to the Increasing Numbers of Internal Passages Between S1 and S2