Design of visible light / LWIR dual-band common aperture imaging optical system

Zhanpeng Ma; Hu Wang; Yang Shen; Fang Wang; Yaoke Xue

doi:10.1117/12.2541742

18 December 2019 Design of visible light / LWIR dual-band common aperture imaging optical system

Zhanpeng Ma, Hu Wang, Yang Shen, Fang Wang, Yaoke Xue

Proceedings Volume 11341, AOPC 2019: Space Optics, Telescopes, and Instrumentation; 113410I (2019) https://doi.org/10.1117/12.2541742
Event: Applied Optics and Photonics China (AOPC2019), 2019, Beijing, China

Abstract

Dual-band imaging system can effectively improve the detection and identification capability for airborne camera. To ensure the system with compact structure and without increasing the complication of the design, a catadioptric system is proposed as an alternative where the visible light and long-wave infrared (LWIR) share the mutual aperture and adding a dichroic beam splitter between the primary and secondary mirrors enables simultaneous imaging of the two bands. The common aperture is achieved by sharing a modified Cassegrain reflection structure in both bands. The entrance pupil diameter for the two bands is 148mm and their field of view (FOV) is 3°. The visible light works in the range of 0.5∼0.8μm and the focal length is 304.2mm with 2048×2048 detector, and the pixel size is 5.5μm. The LWIR works in the range of 8μm∼14μm and the focal length is 205.3mm with 1024×768 infrared detector, and the pixel size is 14μm. The system aberration is well corrected in two bands and for the performance analysis of the system in the temperature range of 20±5‡C, the design results can meet the requirements.

Citation Download Citation

Zhanpeng Ma, Hu Wang, Yang Shen, Fang Wang, and Yaoke Xue "Design of visible light / LWIR dual-band common aperture imaging optical system", Proc. SPIE 11341, AOPC 2019: Space Optics, Telescopes, and Instrumentation, 113410I (18 December 2019); https://doi.org/10.1117/12.2541742

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