...衍射光束中心传感器粉末激光衍射法应用了 夫琅霍夫衍射理论(F激光衍射法应用了 夫琅霍夫衍射理论(Fraunhofer diffraction theory)， 只适用于颗粒直径远大于入射波长的情况即用于几个微米至几百微米的测量波长的情况， 即用于几个微米至几百微米的测量。
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When the diameter of the particles satisfied some conditions, Mie theory is approximate to Fraunhofer diffraction theory.
当颗粒粒径满足一定条件时，米氏光散射可以用夫琅和费衍射来近似。
On the basis of Fraunhofer diffraction theory, the diffraction patterns of a Varied Line-space (VLS) grating were obtained for incidence beam in parallel and uniform.
基于夫琅禾费衍射理论，推导了平行光入射变栅距光栅后衍射光强的角度分布。
Based on the theory of Fraunhofer diffraction, an improved method is introduced to measure Young ' s modulus of steel wires using CCD.
根据夫琅和费衍射原理，采用CCD来测量金属丝在拉力作用下的微小伸长量，对钢丝的杨氏模量进行了测量。
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