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Proceedings Paper

Design of a dual field-of-view optical system for infrared focal-plane arrays
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Paper Abstract

In this paper, the design of a dual field-of-view optical system for 3-5 μm infra-red focal-plane arrays is described. Preliminary calculations are done to determine the first-order parameters of the narrow and the wide-field modes. To achieve a switchable dual field-of-view system, two different optical configurations, one based on the axial motion of a lens group and the other based on a roate-in motion of two separated lens groups, are studied and compared. Diffractive and conic surfaces are used to control the color and the monochromatic aberrations with less number of total lenses used. Paraxial and real-ray modelling of the Narcissus effect is described. It is shown that the rotate-in scheme achieves better optical performance in both the narrow and the wide-fifeld modes. The axial-motion scheme suffers from poor lateral color in the wide-angle mode. The final optical designs along with the aberrations curves and MTF plots are presented showing excellent performance.

Paper Details

Date Published: 16 October 2002
PDF: 11 pages
Proc. SPIE 4767, Current Developments in Lens Design and Optical Engineering III, (16 October 2002); doi: 10.1117/12.451222
Show Author Affiliations
Muhammad Nadeem Akram, Royal Institute of Technology (Sweden)

Published in SPIE Proceedings Vol. 4767:
Current Developments in Lens Design and Optical Engineering III
Robert E. Fischer; Warren J. Smith; R. Barry Johnson, Editor(s)

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