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4 April 2023 Design of dual mode linear scanning infrared zoom optical system
Qing-qing Peng, Xiao-yu Du, Xi Wang
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Proceedings Volume 12617, Ninth Symposium on Novel Photoelectronic Detection Technology and Applications; 1261756 (2023) https://doi.org/10.1117/12.2666457
Event: 9th Symposium on Novel Photoelectronic Detection Technology and Applications (NDTA 2022), 2022, Hefei, China
Abstract
In this paper, a dual-mode linear scanning infrared zoom optical system is proposed. The system has searching and forward-looking dual-mode. Based on 768×8 long-wave infrared line cooled detector, a two-stage zoom optical system with three times imaging structure is designed. Kepler telescope structure with middle image plane was used in the front optical path, and secondary imaging optical structure was used in the rear optical path. The scanning mirror was set at the exit pupil position of the front optical path, so as to reduce the size of the objective lens and scanning mirror. When the system is in searching mode, the scanning mirror is in static state, and the scene scanning image is realized by cooperating with the detector readout circuit through the rotating speed of the turntable. When the system is in the forward-looking mode, it can realize the gaze imaging of 1024×768 by the scanning mirror. The operating band of the optical system is 7.7μm ~10.3μm, F/3, and the focal length is 300mm/100mm. The focal length of the system can be switched by cutting in and out the zoom lens group. At the same time, the resolution is further improved through lens micro scanning in the optical system. The system has the characteristics of flexible working mode, high imaging quality, good optical axis consistency and high transmittance.
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Qing-qing Peng, Xiao-yu Du, and Xi Wang "Design of dual mode linear scanning infrared zoom optical system", Proc. SPIE 12617, Ninth Symposium on Novel Photoelectronic Detection Technology and Applications, 1261756 (4 April 2023); https://doi.org/10.1117/12.2666457
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KEYWORDS
Mirrors
Imaging systems
Zoom lenses
Distortion
Infrared imaging
Modulation transfer functions
Switching
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