Defocus range of off-axis three-mirror anastigmat (TMA) camera under space microgravity

刘. L. Lei, 马. M. Jun, 郑玉权 Zheng Yu-quan
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引用次数: 1

Abstract

The mirror interval and radius of curvature of optical system including three mirrors are often changed due to the impact of space microgravity,which has a greater impact on the back focal length,and causes camera defocus and imaging quality reduction.Through the equivalent Gauss optical system analysis of three-mirror system,back focal length formula can be obtained.By homogeneous coordinate transformation,the reflection mirror rigid-body displacement formula is obtained,and a mirror radius is obtained in the microgravity environment using the least squares fitting algorithm.Finally,by calculating the camera in space microgravity environment,the defocusing amount is 0.04 mm.Results provide a theoretical basis for the design of focusing mechanism.
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空间微重力下离轴三镜消像差相机的离焦范围
由于空间微重力的影响,包含三反射镜的光学系统的反射镜间距和曲率半径经常发生变化,对后焦距的影响较大,导致相机离焦,成像质量下降。通过对三镜系统的等效高斯光学系统分析,得到了后焦距公式。通过齐次坐标变换,得到反射镜刚体位移公式,并利用最小二乘拟合算法得到微重力环境下反射镜半径。最后,通过计算空间微重力环境下相机的离焦量为0.04 mm,为调焦机构的设计提供了理论依据。
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