利用余弦型的复合光栅作为滤波器，在相干光处理系统中可对图像进行微商。
Pattern differentiation can be performed in a coherent Optical processing system if a composite sinusoidal grating is used as a filter.
用软件在计算机上生成虚拟光栅，将两种频率的光栅合成为投影复合光栅进行测量。
The virtual grating was computer generated, so the grating was very fine and the frequency was easily changed.
本文给出了不等距光栅衍射光强度分布的一般公式，并引出了衍射—干涉复合因子的概念。
The general formula of the light strength distribution for a varied-line space grating is introduced. The concept of complex factor of diffraction-interference is conducted.
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