Optical design of a continuous zoom MWIR lens system with large field of view

Xiaopeng Wei; Liang Xu; Jinwei Zhao; Shaobo Geng

doi:10.1117/12.2692193

24 November 2023 Optical design of a continuous zoom MWIR lens system with large field of view

Xiaopeng Wei, Liang Xu, Jinwei Zhao, Shaobo Geng

Proceedings Volume 12935, Fourteenth International Conference on Information Optics and Photonics (CIOP 2023); 1293505 (2023) https://doi.org/10.1117/12.2692193
Event: Fourteenth International Conference on Information Optics and Photonics (CIOP 2023), 2023, Xi’an, China

Abstract

The aberration characteristics change with the relative position changes of zoom groups has been a key problem for continuous zoom lens design, especially those with large target surfaces. To diminish the aberration, in this study, we took a Positive-Negative-Positive-Positive (PNPP) Mechanical structure for optical compensation, and developed a continuous zoom MWIR lens system with 20x magnification. The system used a cooled detector with a large target surface of 1280×1024 pixel and a 12μm pixel size, which improved observing capability under a 66.5° field of view. We tested the transfer function of the system at Nyquist frequency, which is close to the diffraction limit in a 15~300mm zoom range and the full field of view. We further evaluated our system by ray tracing analysis, pressure angle analysis of the cam curve, and de-focusing amount analysis under a temperature range of -45℃ to +70℃. Results show that our system has a good suppression capability for cold reflection, high image quality under extreme thermal conditions, and a smooth zoom curve.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Xiaopeng Wei, Liang Xu, Jinwei Zhao, and Shaobo Geng "Optical design of a continuous zoom MWIR lens system with large field of view", Proc. SPIE 12935, Fourteenth International Conference on Information Optics and Photonics (CIOP 2023), 1293505 (24 November 2023); https://doi.org/10.1117/12.2692193

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