另外，旋转机械由多个转动部件组成，不同转轴对应的阶比在频率上会有交叉。
In addition, rotating machinery is composed of many rotating parts. Orders of different shafts cross each other in frequency.
同时利用CCD相机和四像限探测器(QD)测量了粒子光致旋转的转动频率，研究了粒子的旋转频率随激光功率的变化关系。
At the same time optical rotation of the particles was realized. The rotation frequency was measured by CCD camera and quadrant photodiode detector (QD).
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