Convex aspheric mirror with a large aperture is difficult to test and manufacture, here the Offner compensating method is used to test the convex aspheric mirror. In order to manufacture and test a convex aspheric mirror with a aperture of 300mm diameter , the formula of compensating system is deducted based on the third-order aberration,the initial configuration of 0ffner optical system is calculated with formula, field lens is also added to balance the aberration, then the data of initial configuration is optimized by optical software ZEMAX, the final result of Offner optical system with single compensating lens is obtained after optimization. Finally Offner optical system with double compensating lens is obtained with the same principle.
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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