Dual-point noncoaxial rotational Doppler effect towards synthetic OAM light fields for real-time rotating axis detection  

作　　者：Yanxiang Zhang Zijing Zhang Han Lin Zhongquan Nie Rui Feng Yuan Zhao Baohua Jia 

机构地区：[1]School of Physics,Harbin Institute of Technology,Harbin 150001,China [2]Key Lab of Advanced Transducers and Intelligent Control System,Ministry of Education and Shanxi Province,College of Electronic Information and Optical Engineering,Taiyuan University of Technology,Taiyuan 030024,China [3]Centre for Atomaterials and Nanomanufacturing(CAN),School of Science,RMIT University,Melbourne,3000 VIC,Australia

出　　处：《Light(Advanced Manufacturing)》2023年第4期10-20,共11页光（先进制造）（英文）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.62075049 and 11974258);the Fundamental Research Funds for the Central Universities(FRFCU5710050722,FRFCU5770500522,FRFCU9803502223,and 2023FRFK06007);supported by the Australian Research Council Centre of Excellence(CE230100006).

摘　　要：Probing the axis of a rotator is important in astrophysics,aerospace,manufacturing,machinery,automation,and virtual reality,etc.Existing optical solutions commonly require multiple sequential measurements via symmetry-broken light fields,which make them time-consuming,inefficient,and prone to accumulated errors.Herein,we propose the concept of a dual-point noncoaxial rotational Doppler effect(DNRDE)and demonstrate a one-shot detection technique to solve this problem.An on-demand synthetic orbital angular momentum(OAM)light beam impinges on a rotating scatterer surface,supporting dual-point rotational Doppler shifts,in which the information of the rotating axis is acquired by comparing these two frequency shifts with a prescribed threshold.The existence of arbitrary dual-point Doppler shifts enables the one-time direct identification of rotating axis orientations,which is fundamentally inaccessible in single-point detection.This robust detection technique is compatible with generalised synthetic OAM light fields by utilising optical modal filters.Compared with traditional approaches,our DNRDE-driven detection approach exhibits a four-fold enhancement in measurement speed,higher energy efficiency,and superior accuracy with a maximal absolute measurement error of 2.23°.The proposed dual-point detection method holds great promise for detecting rotating bodies in various applications,such as astronomical surveys and industrial manufacturing.

关 键 词：Rotational Doppler effect Rotating axis orientations Real-time detection Orbital angular momentum Optical vortices 

分 类 号：O43[机械工程—光学工程]