1 February 1985 Cryogenic Refractor Design Techniques
Author Affiliations +
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.
© (1985) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
R. J. Darnell, R. J. Darnell, } "Cryogenic Refractor Design Techniques", Proc. SPIE 0509, Cryogenic Optical Systems and Instruments I, (1 February 1985); doi: 10.1117/12.944983; https://doi.org/10.1117/12.944983
PROCEEDINGS
7 PAGES


SHARE
RELATED CONTENT

Okayama astrophysical observatory wide field camera
Proceedings of SPIE (July 27 2014)
LMIRcam an L M band imager for the LBT...
Proceedings of SPIE (July 27 2008)
Far-infrared blocked impurity band detector development
Proceedings of SPIE (September 25 2007)
Cryogenic measurements of Aerojet GaAs n-JFETs
Proceedings of SPIE (June 30 1992)
WIRCam the infrared wide field camera for the Canada...
Proceedings of SPIE (September 29 2004)

Back to Top