Design of large zoom ratio long-wave infrared zoom system with compound zoom method

Cao Chao; Zhiyuan Liao; Bai Yu; Tingwen Xing

doi:10.1117/1.OE.57.2.025104

20 February 2018 Design of large zoom ratio long-wave infrared zoom system with compound zoom method

Cao Chao, Zhiyuan Liao, Bai Yu, Tingwen Xing

Author Affiliations +

Optical Engineering, Vol. 57, Issue 2, 025104 (February 2018). https://doi.org/10.1117/1.OE.57.2.025104

Abstract

The continuous zoom system with a large zoom ratio can search for a target in the wider field-of-view and distinguish a target at a further distance. As the range of focal length is limited for a traditional continuous zoom system, we present a compound zoom method to greatly increase the range of focal length for a traditional continuous zoom system. The compound zoom method combines the traditional zoom system with a dual field-of-view zoom system to achieve a large zoom ratio. The differential equation model of the compound zoom method is established. Based on this model, a long-wave infrared zoom system with a zoom ratio of 36 and F/1.6 is designed, and it has such advantages as large zoom ratio, simple mechanical structure, good image quality, and smooth cam curves.

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Cao Chao, Zhiyuan Liao, Bai Yu, and Tingwen Xing "Design of large zoom ratio long-wave infrared zoom system with compound zoom method," Optical Engineering 57(2), 025104 (20 February 2018). https://doi.org/10.1117/1.OE.57.2.025104

Received: 13 November 2017; Accepted: 19 January 2018; Published: 20 February 2018

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