Self-null corrector test for telescope hyperbolic secondaries

Physics – Optics

Scientific paper

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Cassegrain Optics, Mirrors, Optical Correction Procedure, Performance Tests, Reflecting Telescopes, Aberration, Cost Effectiveness, Hyperbolic Functions, Surface Geometry

Scientific paper

Astronomers have usually employed a Hindle sphere to test the secondaries of Cassegrain and Ritchey-Chretien telescopes. For very large telescopes, such as the 7.6-m telescope planned by the University of Texas, the cost of a traditional Hindle sphere (approximately 200 in. in diameter) is high enough to justify a search for a less expensive way to test the secondary. In connection with the present investigation, a number of options involving smaller spherical test mirrors have been examined. However, it was found that the use of such mirrors is not feasible. Other studies led to the design of a null test in which both spherical aberration and coma are zero. For a more general use of the considered test, attention is given to the variation in the conjugate positions as the conic constant changes for a secondary of 100-unit radius of curvature.

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