Removable atmosphere dispersion corrector for 8-M telescope design

Details Removable atmosphere dispersion corrector for 8-M telescope design Removable atmosphere dispersion corrector for 8-M telescope design

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990spie.1236..334l&link_type=abstract

IN: Advanced technology optical telescopes IV; Proceedings of the Meeting, Tucson, AZ, Feb. 12-16, 1990. Part 1 (A91-23201 08-89

Physics

Optics

Atmospheric Effects, Cassegrain Optics, Image Processing, Optical Correction Procedure, Telescopes, Correction, Lenses, Light Transmission, Mirrors, Optical Properties

Scientific paper

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.

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