Remote detection of a rotator based on rotational Doppler effect
Yanwang Zhai, Shiyao Fu, Jianqiang Zhang, Yanlai Lv, Heng Zhou, Chunqing Gao
Abstract
Based on the rotational Doppler effect arising from optical orbital angular momentum , we proposed the detection system of a rotator over a distance, by probing the object with a Laguerre–Gauss beam and a Kepler telescope. The angular velocities in tens of meters detection distances can be detected by analyzing the returned beating signals. Different probe beams with various topological charges from l = ± 25 to l = ± 45 are employed. The biggest measurement error is 1.15 Hz. This scheme proves the feasibility of a practical sensor to detect a rotator remotely.
Topics & Concepts
Angular momentumPhysicsDoppler effectOpticsInterferometryAstronomyClassical mechanicsOrbital Angular Momentum in OpticsExperimental and Theoretical Physics StudiesAdaptive optics and wavefront sensing