Design of cooled MWIR continuous zoom optical system for long-range surveillance
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https://doi.org/10.54939/1859-1043.j.mst.105.2025.98-105Keywords:
Optical design; Continuous zoom lens; Athermalized focus; Cooled detector.Abstract
The continuous zoom optical system based on the cooled infrared detector can achieve high-quality imaging in multiple FOVs. Based on the continuous zoom theoretical model, this paper designs a MWIR continuous zoom athermal optical system consisting of only six lenses. The system has an F# of 4.0, a working range of 3.4 - 4.9 μm, a field of view ranging from 21.8°×17.5° to 1.6°×1.3°. All six lenses in the optical system contain aspherical surfaces with two diffraction surfaces to eliminate aberrations, optimizing the size and weight. The optical system compensates for temperature through an active focusing mechanism. The MWIR continuous zoom optical system has a compact structure and good imaging quality in the whole FOV in the temperature range of - 10 ℃ ~ + 60 ℃.
References
[1]. N. A. Muhammed, “Design of a multiple field-of-view imaging system for the 3-5 µm infrared focal plane arrays,” Opt. Eng., 42(6), pp. 1704-1714, (2003).
[2]. H. S. Kim, et al. “Compact mid-wavelength infrared zoom camera with 20:1 range and automatic athermalization,” Opt. Eng., 41, pp. 1661-1667, (2002).
[3]. Y. Bai, et al. “Design of MWIR step-zoom detection imaging system with a large FPA,” 7th International Symposium on Advanced Optical Manufacturing and Testing Technologies, (2014).
[4]. H. Wu, P. Wang. “Design of miniaturized large-format uncooled infrared continuous zoom optical system”. Infrared, 41(2): 1-6, (2020).
[5]. Y. Tang, et al. “Athermalization design of uncooled long waveband infrared continuous zoom optical system”. Acta Optica Sinica, 44(7): 0722002, (2024).
[6]. Z. Fan, et al. “Design of high ratio middle infrared continuous zoom optical system,” Proc. SPIE 8193, International Symposium on Photoelectronic Detection and Imaging 2011: Advances in Infrared Imaging and Applications, 81931R, (2011).
[7]. K. Zhang, et al., “40× zoom optical system design based on stable imaging principle of four groups” Appl. Opt. 61, 1516-1522, (2022).
[8]. Z. Yang, et al., “Optimization method of the cam curve for a continuous zoom optical system” Appl. Opt. 63, 816-822, (2024).
[9]. G. Bieszczad, et al. “Image processing module for high-speed thermal camera with cooled detector” Infrared Technology and Applications XXXVII. Vol. 8012. SPIE, (2011).
[10]. R. K. Bhan, et al. “Recent infrared detector technologies, applications, trends and development of HgCdTe based cooled infrared focal plane arrays and their characterization.” Opto-Electronics Review 27(2), 174-193, (2019).
[11]. J. Bareła, et al. “Comparison of parameters of modern cooled and uncooled thermal cameras.” Electro-Optical and Infrared Systems: Technology and Applications XIV. Vol. 10433. SPIE, (2017).
[12]. Tao C K. “Zoom Focus Optics System Design”. National Defense Industry Press, Beijing, (1988).
[13]. H. Tang, et al. “Design of cooled long-wave infrared optical system with large zooming range”, Chinese Optics 17(1), 69-78, (2024).
[14]. N. T. Binh. “Quang học” , Hanoi National University Publishing House, Hanoi, (2007), (in Vietnamese).
[15]. https://www.flircameras.com/neutrino/neutrino-lc-series/425-0640140-1paax.htm.
[16]. N. Q. Hiep, “Nghiên cứu thiết kế hệ thống quang học của ống kính ảnh nhiệt có tiêu cự thay đổi nhảy bậc”, Journal of Science and Technology, 18(2), (2023), (in Vietnamese).
[17]. N. Q. Hiep, “Thiết kế hệ thống quang học hoạt động trong hai vùng phổ nhìn thấy và hồng ngoại bước sóng dài”, Journal of Science and Technology, 02(09), (2023), (in Vietnamese).
