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。
Vector expression is adopted in analyzing the relation between off-axis parabolic parameters and collimation property.
本文提出了利用平板剪切干涉法检验激光束准直性的一种改进方案。
An improved approach for testing laser collimation by using plate shearing interferometry is put forward in the paper.
探测器在轨测量时的实际准直性可能比在地面实验中所测得的准直性更好。
The actual directivity of the detector which is possessed in the space orbit perhaps is higher than that obtained in the experiment system on the ground.
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