Share Email Print
cover

Proceedings Paper

Removable atmospheric dispersion corrector for 8-m telescope design
Author(s): Ming Liang
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper 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.

Paper Details

Date Published: 1 July 1990
PDF: 13 pages
Proc. SPIE 1236, Advanced Technology Optical Telescopes IV, (1 July 1990); doi: 10.1117/12.19177
Show Author Affiliations
Ming Liang, National Optical Astronomy Observatories (United States)


Published in SPIE Proceedings Vol. 1236:
Advanced Technology Optical Telescopes IV
Lawrence D. Barr, Editor(s)

© SPIE. Terms of Use
Back to Top