Analysis of rotational Doppler effect based on radio waves carrying orbital angular momentum
Analysis of rotational Doppler effect based on radio waves carrying orbital angular momentum
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基于携带轨道角动量的无线电波的旋转多普勒效应分析
DOI：
10.1063/1.5050448
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发表时间：
2018-10
影响因子：
3.2
通讯作者：
Xianmin Zhang
中科院分区：
文献类型：
--
作者：
Jiayu Zheng;Shilie Zheng;Zhenlei Shao;Xianmin Zhang
携带轨道角动量(OAM)的电磁波束具有扭曲的相前，照射在自转物体上时会引起旋转的多普勒频移。本文对搭载OAM的无线电波产生的旋转多普勒效应进行了理论分析和实验验证。与光学涡旋波束相比，携带OAM的无线电波的发散角通常比光学涡旋波束的发散角大，这导致了基于无线电OAM的传感系统具有较短的探测距离。在这种情况下，接收器的位置和旋转平面的偏转是影响无线电旋转多普勒效应的重要因素。对于离轴接收器或偏转的自旋物体，当载有拓扑电荷为L的光波照射自旋物体时，会引起一系列额外的多普勒频移(L ± N)Ω/2π，甚至对于L = 0平面波也是如此。因此，应利用高阶OAM波来区分真实的旋转频移，提高对自转速度的检测灵敏度。结合旋转多普勒效应和线性多普勒效应，讨论了一种矢量测速方案。携带轨道角动量(OAM)的电磁波束照射在旋转的物体上时，会产生旋转的多普勒频移。本文对搭载OAM的无线电波产生的旋转多普勒效应进行了理论分析和实验验证。与光学涡旋波束相比，携带OAM的无线电波的发散角通常比光学涡旋波束的发散角大，这导致了基于无线电OAM的传感系统具有较短的探测距离。在这种情况下，接收器的位置和旋转平面的偏转是影响无线电旋转多普勒效应的重要因素。对于离轴接收器或偏转的自旋物体，当载有拓扑电荷为L的光波照射自旋物体时，会引起一系列额外的多普勒频移(L ± N)Ω/2π，甚至对于L = 0平面波也是如此。因此，应利用高阶OAM波进行识别。
The electromagnetic beam carrying orbital angular momentum (OAM) has a twisted phase front, which can induce a rotational Doppler frequency shift when it is illuminating on a spinning object. In this paper, the rotational Doppler effect induced by a radio wave carrying OAM is theoretically analyzed and experimentally verified. Compared with an optical vortex beam, the divergence angle of a radio wave carrying OAM is typically larger than that of an optical vortex beam, which results in the radio OAM-based sensing system with short-range detection distance. In this case, the receiver's location and the deflection of the rotating plane are important factors that affect the radio rotational Doppler effect. For an off-axis receiver or a deflected spinning object, a series of extra Doppler frequency shifts (L ± N)Ω/2π are induced when the spinning object is illuminated by a wave carrying OAM with topological charge L, even for L = 0, the plane wave. Hence, the high order OAM wave should be used to distinguish the real rotational frequency shift and improve detection sensitivity of spinning velocity. Combining the rotational Doppler effect with the linear Doppler effect, a vector velocity detecting scheme is discussed.The electromagnetic beam carrying orbital angular momentum (OAM) has a twisted phase front, which can induce a rotational Doppler frequency shift when it is illuminating on a spinning object. In this paper, the rotational Doppler effect induced by a radio wave carrying OAM is theoretically analyzed and experimentally verified. Compared with an optical vortex beam, the divergence angle of a radio wave carrying OAM is typically larger than that of an optical vortex beam, which results in the radio OAM-based sensing system with short-range detection distance. In this case, the receiver's location and the deflection of the rotating plane are important factors that affect the radio rotational Doppler effect. For an off-axis receiver or a deflected spinning object, a series of extra Doppler frequency shifts (L ± N)Ω/2π are induced when the spinning object is illuminated by a wave carrying OAM with topological charge L, even for L = 0, the plane wave. Hence, the high order OAM wave should be used to distinguish ...
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