半峰宽（peak width at half-height，Wh/2)：通过峰高的中点作平行于峰底的直线，此直线与峰两侧相交两点之间的距离。
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peak width at half height 半峰宽
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In this paper resolving power of diffraction gratings and its measuring methods in width at half height of central peak are described.
本文叙述了平面衍射光栅分辨率及其半宽度测量法。
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