When the laser beams project in the relief gratings, its transmission diffraction patterns represent the surface informations of the relief gratings.
当激光束投射在浮雕光栅上，透过光栅的衍射光斑就反映了浮雕光栅的表面信息。
When the laser beams project in the relief gratings, its transmission diffraction patterns represent the surface informations of the relief gratings.
当激光束投射在浮雕光栅上，透过光栅的衍射光斑就反映了浮雕光栅的表面信息。
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