双透镜脉冲展宽分幅相机成像特性研究

Imaging Performance of Double-Lens Pulse-Dilation Framing Camera

报道了一种采用双磁透镜校正像差的脉冲展宽分幅相机,并对其空间分辨率、场曲及象散特性进行分析。当缩放比例为2∶1时,采用单透镜的分幅相机工作面的半径为15 mm,离轴15 mm处空间分辨率为2 lp/mm;采用双透镜对像差进行校正后,工作面的半径提升至30 mm,离轴15 mm处空间分辨率提升为5 lp/mm。通过实验和仿真对单透镜和双透镜成像系统的像场弯曲进行拟合,场曲面离轴15 mm处成像点与轴上像点的轴向距离在单透镜成像系统中约为11 cm,在双透镜成像系统中约为3 cm。对双透镜系统的象散进行分析,并对子午像面和弧矢像面进行拟合,相机的子午空间分辨率和弧矢空间分辨率均可达到10 lp/mm。

In this study,a pulsedilation framing camera using double magnetic lenses to correct aberrations is reported.The spatial resolution,field curvature,and astigmatism characteristics of the camera were analyzed.When the imaging ratio is 2:1,the radius of the working area of the framing camera with a single magnetic lens is 15 mm,and the spatial resolution at a 15-mm offaxis distance is 2 lp/mm.When double magnetic lenses are used in this system,some aberrations are corrected,the radius of the working area is 30 mm,and the spatial resolution at a 15-mm offaxis distance is 5 lp/mm.The field curvature of the camera with a single lens and double lenses was measured and simulated.In a singlelens imaging system,the axial distance between the imaging point at 15-mm offaxis of the field surface and the image point on the axis is around 11 cm,while in a doublelens imaging system,it is about 3 cm.The astigmatism of the doublelens system is analyzed.In the experiment,sagittal and tangential image surfaces are fitted,and the sagittal and tangential resolutions can reach 10 lp/mm.