计算了面状目标经入射光瞳的光辐射通过系统后，进到出射窗的能量占总能量的百分比T。对下述一系列不同的情况具体推导了公式：圆环和长方环形的衍射瞳孔；
Also is calculated the ratio T of the energy passing through the system onto the exit window , to the total energy radiated from a plane target into the entrance pupil .
入射光瞳