The principle of measuring the self-height of cylindrical hole defect by ultrasonic tip diffraction technique was analyzed based on the characteristics of reflected and diffracted waves.
根据柱孔缺陷的端点反射波和衍射波的特点，分析了用端点衍射法测定柱孔类缺陷自身高度的原理。
Segment alignment of tip-tilt is fulfilled by overlapping diffraction pattern centroids of the three individual segments on the focal plane.
该系统通过调整两块可动子镜，使其焦面光斑的质心位置与固定镜的重合校正子镜间的相对倾斜。
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