Mr. Shao Zheming Profile

Shao Zheming

at Jiuzhiyang Infrared System Co Ltd

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Proceedings Article | 8 November 2018 Paper

A middle-wave infrared continuous-zoom optical system with 2x expander

Shao Zheming, Xiong Tao

Proceedings Volume 10815, 108151J (2018) https://doi.org/10.1117/12.2502556

KEYWORDS: Zoom lenses, Mid-IR, Infrared zoom, Infrared radiation, Imaging systems, Image quality, Infrared imaging, Lenses, Reflectors

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The report summarizes the design technique of middle infrared continuous zoom optical system with 2×expander and recites the design technique of optimizing continuous zoom optical system with expander, of correcting aberration in long focal length and large aperture optical system and of analyzing and controlling of narcissus effect. The above-mentioned techniques have formed a general method of designing continuous zoom infrared optical system with expander. Based on these design techniques, a MWIR long focal length continuous zoom optical system with expander has been developed. The system is composed of a 2× expander, a zoom system and a secondary imaging system with off-centred folded path which comprises eight lenses and two reflectors. The spectral band of the system is 3.7~4.8μm and it can realize 62.5mm ~ 500mm continuous zoom. This optical system can achieve 100% cold stop efficiency. The optical system can achieve 100% cold stop efficiency, smooth zoom and long focal length, and has large aperture and high image quality. The testing results show that its image quality can meet the requirements of application.

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