The Design And Manufacture Of A Continuous Zoom Lens For Thermal Imaging In The 8 To 14 Micron Atmospheric Window

P. J. Rogers; G. N. Andrews

doi:10.1117/12.955325

10 April 1977 The Design And Manufacture Of A Continuous Zoom Lens For Thermal Imaging In The 8 To 14 Micron Atmospheric Window

P. J. Rogers, G. N. Andrews

Author Affiliations +

Proceedings Volume 0099, 3rd European Electro-Optics Conf; (1977) https://doi.org/10.1117/12.955325
Event: Third European Electro-Optics Conference, 1976, Geneva, Switzerland

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.

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P. J. Rogers and G. N. Andrews "The Design And Manufacture Of A Continuous Zoom Lens For Thermal Imaging In The 8 To 14 Micron Atmospheric Window", Proc. SPIE 0099, 3rd European Electro-Optics Conf, (10 April 1977); https://doi.org/10.1117/12.955325

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