20 February 2018 Design of large zoom ratio long-wave infrared zoom system with compound zoom method
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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.
© 2018 Society of Photo-Optical Instrumentation Engineers (SPIE)
Cao Chao, Zhiyuan Liao, Bai Yu, 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 . Submission: Received: 13 November 2017; Accepted: 19 January 2018
Received: 13 November 2017; Accepted: 19 January 2018; Published: 20 February 2018
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