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Proceedings Paper

Design of infrared zoom system with rotating lens group
Author(s): Yong Li; Changcheng Yang; Shenghui Li
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Paper Abstract

In surveillance applications there is a need for infrared zoom systems which give two fields of view. For such systems long operation range is the most critical parameter which is bound up with focal length and transmittance of systems. In this paper the design of an infrared zoom system with rotating lens group is described. Different from the conventional axially moving zoom systems, this system is based on a rotating mechanism consisting of two separated lenses. The system achieves dual FOVs due to different magnifications. In narrow field of view mode, the system has long focal length and higher transmittance because the rotating lens group is outside the optical path. The final design is an infrared zoom system operating in 3μm~5μm, with a F number of 4.0, EFL of 250mm/62.5mm. This paper contains the calculation of first-order parameter, the optimum design of rotating motion, the analysis of aberrations, MTF, and Narcissus, This designed system has diffraction limited image quality of in both FOVs.

Paper Details

Date Published: 28 November 2007
PDF: 9 pages
Proc. SPIE 6834, Optical Design and Testing III, 68343Y (28 November 2007); doi: 10.1117/12.759875
Show Author Affiliations
Yong Li, Huazhong Institute of Electro-Optics (China)
Changcheng Yang, Huazhong Institute of Electro-Optics (China)
Shenghui Li, Huazhong Institute of Electro-Optics (China)


Published in SPIE Proceedings Vol. 6834:
Optical Design and Testing III
Yongtian Wang; Theo T. Tschudi; Jannick P. Rolland; Kimio Tatsuno, Editor(s)

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