Removable atmospheric dispersion corrector for 8-m telescope design

Ming Liang

doi:10.1117/12.19177

1 July 1990 Removable atmospheric dispersion corrector for 8-m telescope design

Ming Liang

Proceedings Volume 1236, Advanced Technology Optical Telescopes IV; (1990) https://doi.org/10.1117/12.19177
Event: SPIE Astronomical Telescopes and Instrumentation for the 21st Century, 1990, Tucson, AZ, United States

Abstract

Normally the atmosphere dispersion compensator (ADC) is a permanent fixture in the image corrector, even though at times the ADC is not needed. But, in Cassegrain focus it is possible to design a removable ADC, which can be taken out to achieve higher light transmission. Three such design examples are given in this paper. All of them are designed for the Cassegrain focus of the planned NOAO 8-meter telescope project. At this focus, the aberration corrector has three lenses. In the first two designs, the ADC has to be inserted between the second and third lens of the corrector; in the third the ADC is placed behind the third lens of the corrector. The first design requires adjustment of the secondary mirror of the telescope as well as the third lens of the aberration corrector when the ADC is inserted. The second design does not require any adjustment but requires two extra curved surfaces in the ADC. In the third design, the focal surface, the secondary mirror, and the third lens require adjustment. Spot diagrams of the three designs at three zenith distances are given.

Citation Download Citation

Ming Liang "Removable atmospheric dispersion corrector for 8-m telescope design", Proc. SPIE 1236, Advanced Technology Optical Telescopes IV, (1 July 1990); https://doi.org/10.1117/12.19177

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