Cryogenic Refractor Design Techniques

R. J. Darnell

doi:10.1117/12.944983

1 February 1985 Cryogenic Refractor Design Techniques

R. J. Darnell

Proceedings Volume 0509, Cryogenic Optical Systems and Instruments I; (1985) https://doi.org/10.1117/12.944983
Event: 28th Annual Technical Symposium, 1984, San Diego, United States

Abstract

The Infrared Astronomical Satellite (IRAS) was designed to operate at 2K, and over the spectral range of 8 to 120 micrometers. The focal plane is approximately 2 by 3 inches in size, and contains 62 individual field stop apertures, each with its own field lens, one or more filters and a detector. The design of the lenses involved a number of difficulties and challenges that are not usually encountered in optical design. Operating temperature is as-sumed during the design phase, which requires reliable information on dN/dT (Index Coeffi-cient) for the materials. The optics and all supporting structures are then expanded to room temperature, which requires expansion coefficient data on the various materials, and meticulous attention to detail. The small size and dense packaging, as well as the high precision required, further contributed to the magnitude of the task.

Citation Download Citation

R. J. Darnell "Cryogenic Refractor Design Techniques", Proc. SPIE 0509, Cryogenic Optical Systems and Instruments I, (1 February 1985); https://doi.org/10.1117/12.944983

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