Zhang Zijing, Cen Longzhu, Zhang Jiandong, Hu Junyan, Wang Feng, Zhao Yuan
Opt Express. 2020 Mar 2;28(5):6859-6867. doi: 10.1364/OE.380324.
Based on the rotational Doppler effect, an orbital angular momentum beam can measure the lateral rotation velocity of an object, which has broad application prospects. However, all existing research focus on the light spot center coinciding with the rotation center, or only with small center offset. This is difficult to ensure in remote detection applications. In this paper, the rotational Doppler frequency shifts under three cases, including no center offset, small center offset and large center offset, are analyzed theoretically. Through theoretical research results, a novel method of measuring rotation velocity is proposed, with the light spot completely deviated out of the rotation center. A laboratory verification experiment shows that this proposed method breaks the limit of center offset of lateral rotation velocity measurement and is of great significance to the remote detection of non-cooperative rotation object.
基于旋转多普勒效应，轨道角动量光束能够测量物体的横向旋转速度，具有广阔的应用前景。然而，现有的所有研究都集中在光斑中心与旋转中心重合，或者仅有小的中心偏移的情况。这在远程探测应用中很难保证。本文从理论上分析了无中心偏移、小中心偏移和大中心偏移三种情况下的旋转多普勒频移。通过理论研究结果，提出了一种光斑完全偏离旋转中心的测量旋转速度的新方法。实验室验证实验表明，该方法突破了横向旋转速度测量的中心偏移限制，对非合作旋转目标的远程探测具有重要意义。
