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Proceedings Paper

Predicting The Focus Of Cryogenically-Cooled Optical Systems
Author(s): Roy W. Esplin; Ronald J. Huppi; Louis R. Fantozzi; Ronald A. Lange
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Paper Abstract

Results of an experimental study to ascertain how well the focal-plane location of cryogenically-cooled optical systems can be predicted are reported. These results indicate that if the required low-temperature thermal expansion and index-of-refraction data are available, the focal shift caused by cooling to cryogenic temperatures can be accurately predicted by simply computing the shift in the paraxial focus. In this study, the differences between the measured focal shifts and the computed shift in the paraxial focus were less than the diffraction-limited depth-of-focus tolerance. The results of this study also indicate that for off-the-shelf optical systems ray-tracing analysis may not adequately predict the absolute location of the focal plane. Thus, the following method of predicting the focal-plane location of a cryogenically-cooled optical system is suggested: first measure the focal-plane location with the optics at room temperature, and then add the computed paraxial focal shift to the measured location.

Paper Details

Date Published: 3 November 1980
PDF: 6 pages
Proc. SPIE 0245, Cryogenically Cooled Sensor Technology, (3 November 1980); doi: 10.1117/12.959347
Show Author Affiliations
Roy W. Esplin, Utah State University (United States)
Ronald J. Huppi, Utah State University (United States)
Louis R. Fantozzi, Diversified Optical Corporation (United States)
Ronald A. Lange, Eaton Corporation (United States)


Published in SPIE Proceedings Vol. 0245:
Cryogenically Cooled Sensor Technology
Ronald J. Huppi, Editor(s)

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