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14 September 2018 Design of the compact off-axis four-mirror optical system with conformal fairing
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Abstract
Off-axis reflective optics, due to its no chromatic, no obscuration, small size, compact structure, easy to achieve wide field of view(FOV), high-quality imaging and other features, are widely concerned. In this paper, the conformal ellipsoidal dome of MgF2 material is used to allay the air resistance and reduce the aerodynamic heating effect of the missile head. The compact off-axis four-mirror is used to realize a conformal optical system of the seeker with medium wave infrared(MWIR),which the working waveband is 3~5μm, F number is 2, FOV is ±1 degree and the focal length is 55mm. The optics achieve 100% cold aperture efficiency and the MTF value of each field at 17lp/mm is greater than 0.7. It has a working distance of 17.4mm and a sapphire window 14.7mm apart from the focal plane, leaving plenty of room for the refrigerant detector. This system can also meet the high accuracy positioning with imaging quality requirements and ensure light design of the seeker.
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Qi Li, Song Xu, Kun Yu, Jinyan Kan, and Rongsheng Qiu "Design of the compact off-axis four-mirror optical system with conformal fairing", Proc. SPIE 10742, Optical Manufacturing and Testing XII, 107421B (14 September 2018); https://doi.org/10.1117/12.2320503
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