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Proceedings Paper

The Design And Manufacture Of A Continuous Zoom Lens For Thermal Imaging In The 8 To 14 Micron Atmospheric Window
Author(s): P. J. Rogers; G. N. Andrews
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Paper Abstract

This lens was designed to have a near diffraction limited performance on axis in the long focal length configuration. Subsequent M.T.F. testing has confirmed this. Apart from the mechanical constraints, the lens presented severe design constraints to the optical designer. The range of infra-red materials available to the optical designer is limited, and the materials have a high refractive index requiring efficient anti-reflection coatings to optimize overall transmission. Blanks were interferometrically tested to ensure acceptability of internal quality prior to working into lens elements. These materials also have a high temperature coefficient of refractive index necessitating studies into methods of athermalizing the lens. A simple but effective method of achieving temperature correction, as fitted to this lens, is described.

Paper Details

Date Published: 10 April 1977
PDF: 15 pages
Proc. SPIE 0099, 3rd European Electro-Optics Conf, (10 April 1977); doi: 10.1117/12.955325
Show Author Affiliations
P. J. Rogers, Pilkington P. E. Limited (U. K.)
G. N. Andrews, Pilkington P. E. Limited (U. K.)

Published in SPIE Proceedings Vol. 0099:
3rd European Electro-Optics Conf
Herbert A. Elion, Editor(s)

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