Physics – Optics
Scientific paper
Feb 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984rpee........66k&link_type=abstract
In its USSR Rept.: Eng. and Equipment (JPRS-UEQ-84-001) p 66-67 (SEE N85-24034 14-31) Transl. into ENGLISH from Opt.-Mekhan. P
Physics
Optics
Aberration, Compensators, Parallel Plates, Telescopes, Apertures, Geometrical Optics, Mirrors, Thickness
Scientific paper
A specially constructed plane parallel compensator plate in a ring telescope catodioptric objective does not affect the size of the dead zone in the pupil and will not only eliminate parasitic flare or bright spots but also allow the relative aperture of each mirror and of the entire objective to be substantially enlarged. Such a plate consists of two elements, the smaller one with a diameter equal to that of the secondary mirror placed at the center of the larger one so as to face that mirror. Here the aberration characteristics of this compensator are analyzed according to the laws of geometric optics for wide beams of light rays. Five different compensator configurations are conceived on this basis for complete correction of spherical aberration, with the appropriate formulas given for calculating the necessary plate thickness.
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