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本文讲述一种能够改善用于8到13μm波段成象系统中的全锗三镜组的场性能的方法。此方法也可用于改善消色差三镜组或非球面双镜组的性能。其原理是用一个平场透镜代替探测器的锗窗口,使透镜组的曲率最佳,以得到最小场曲;场曲和色差是相对孔径约f/0.7的热象系统中的一个最严重的剩余象差。本文还证明了,对于这样的相对孔径和小于15度的典型视场,当焦距为100mm时,孔径光(?)的位置不是一个重要设计参数。这是锗固有的光学性质决定的。
This article describes a method that can improve the field performance of the all-germanium tri-mirror array used in the imaging system of the 8 to 13 μm band. This method can also be used to improve the performance of achromatic triplets or aspherical doublets. The principle is to replace the germanium window of the detector with a flat field lens to optimize the curvature of the lens group to obtain the minimum field curvature; field curvature and chromatic aberration are the most serious of the thermal imaging systems with a relative aperture of about f / 0.7 Remaining aberration. It has also been demonstrated that for such a relative aperture and a typical field of view of less than 15 degrees, the position of the aperture (?) Is not an important design parameter at a focal length of 100 mm. This is due to the inherent optical properties of germanium.