The series density formulae of the binary phase grating are obtained from the general complex amplitude transmittance formulae through Fourier integral.
它直接从位相物体振幅透过率的一般公式出发，运用傅里叶积分，求得二进制位相光栅各级衍射光强度的通式。
After modular multi-grating spectrometer measurement, the average transmittance in the air is found to be 80%.
用组合式多功能光栅光谱仪测得其在空气中的透光率均在80%以上。
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