系统以双无衍射光束作为测量光束，结构简单灵活。
In this system, the dual non diffracting beams are used as incident beams. The system structure is simple and flexible.
另外也介绍了到目前为止测量光束轨道角动量的方法。
In addition, method of the measurement of the orbital angular momentum is demonstrated.
该系统用无衍射光作测量光束，用虚拟探测器扩展探测器尺寸。
The non diffracting beam is used as the measuring beam and a virtual detector is used to expand detector size.
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