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2013•Journal of Changchun University of Science and TechnologyRequires access

Design of LWFIR Zoom Optical System with Large Relative Aperture

Qin Zhipen

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Abstract

A high-speed uncooled infrared zoom optical system in the spectrum 8-12μm region is designed.The system is a simple structure with four parts and five pieces lens;the rear fixed unit is composed of two lenses,the rest are only one lens.The effective focal length ranges from 50mm to 200mm.The relative aperture is 1∶1. The zoom cam curve shape and data are given by zpl which is can be applied to two-ariable-unit zoom system,in this way the requirement of defocus was satisfied at some focal length.Image quality evaluation result shows that the MTF is higher than 0.4 in all field of view at the spatial frequency 20 lp/mm.

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What this paper is about

A high-speed uncooled infrared zoom optical system in the spectrum 8-12μm region is designed.The system is a simple structure with four parts and five pieces lens;the rear fixed unit is composed of two lenses,the rest are only one lens.The effective focal length ranges from 50mm to 200mm.The relative aperture is 1∶1. The zoom cam curve shape and data are given by zpl which is can be applied to two-ariable-unit zoom system,in this way the requirement of defocus was satisfied at some focal length.Image quality evaluation result shows that the MTF is higher than 0.4 in all field of view at the spatial frequency 20 lp/mm.

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Available abstract

A high-speed uncooled infrared zoom optical system in the spectrum 8-12μm region is designed.The system is a simple structure with four parts and five pieces lens;the rear fixed unit is composed of two lenses,the rest are only one lens.The effective focal length ranges from 50mm to 200mm.The relative aperture is 1∶1. The zoom cam curve shape and data are given by zpl which is can be applied to two-ariable-unit zoom system,in this way the requirement of defocus was satisfied at some focal length.Image quality evaluation result shows that the MTF is higher than 0.4 in all field of view at the spatial frequency 20 lp/mm.

Key concepts: Zoom, Focal length, Zoom lens, Aperture (computer memory), Optics, Lens (geology), Image quality, Entrance pupil

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