Considerations on balloon-borne far infrared telescopes |
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| Affiliation: | 1. Durban University of Technology, P.O. Box 155, Maphumulo, 4470 Durban, South Africa;2. Durban University of Technology, 3 Steve Biko Road, Gate six Ritson campus, Department of Radiography, Durban, South Africa |
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| Abstract: | The design of a telescope devoted to infrared and millimetric differential measurements is described. The optics are well corrected for aberrations, either in the on-axis or in the off-axis configurations, for tilt angles ∼1° of the secondary mirror. The diffraction pattern at large angles is calculated as a function of the surface quality and the in flight background at ballon altitude is estimated. |
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