本文叙述了平面衍射光栅分辨率及其半宽度测量法。
In this paper resolving power of diffraction gratings and its measuring methods in width at half height of central peak are described.
实验以一平面石膏为测量对象，根据测量结果，验证了该方法的正确性和有效性，对采用相移技术的三维测量法具有重要的意义。
Experimental results show the method correctness and validity through having an experiment on testing a gypsum plane. The way is significant for the 3-d measurement with phase shifting technology.
方法应用三维超声平面体积测量法测量173例孕龄2 2～ 39周正常胎儿肝体积。
Methods Fetal liver volume from 173 normal fetuses, ranging between 22~39 weeks old, was individually measured by three dimensional ultrasound.
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