离轴抛物镜准直特性的研究

由于反射式离轴抛物镜不产生色差并具有较大的有效孔径,已经广泛应用于辐射校准、宽波段的目标模拟和能量聚焦工作中。影响离轴抛物镜准直特性的主要因素有离轴量,有效孔径和焦面出射点的位置。采用矢量的方法,分析了离轴量等参量和准直性能之间的关系。给出了焦面出射点的位置从0~0.05f,相对孔径D/f从0~0.40,相对离轴量h/f从0.1~0.5变化时,离轴抛物镜准直仪的准直性能曲线。运用CODE V对矢量法的分析结果进行了验证,在条件一致的情形,两者结果吻合。这些结果有助于准直仪的设计。

Study on Collimation Property of Off-Axis Parabolic Mirror

Reflective off-axis parabolic mirror has been widely used in radiation calibration,broadband target simulation and energy focusing,because it does not produce chromatic-aberration and has bigger available aperture.The basic factors affecting collimating characteristic are off-axis magnitude,effective aperture and emission position on the focal plane of off-axis parabolic mirror.Vector expression is adopted in analyzing the relation between off-axis parabolic parameters and collimation property.Curves for collimation property of the off-axis collimator are given out in three aspects: the emission position on focal plane varied from 0 to 0.05f,the relative aperture D/f varied from 0 to 0.40 and the relative off-axis magnitude h/f varied from 0.1 to 0.5.Analysis results obtained through vector method are validated by CODE V and tally with those from CODE V under the same conditions.The results are helpful to design parabolic collimators.