title: Measurement of the rotational Doppler frequency shift of a spinning object using a radio frequency orbital angular momentum beam.
abstract: An indirect approach based on phase measurement is proposed to measure the rotational Doppler frequency shift, which takes full advantage of the phase structure of orbital angular momentum (OAM) beams in radio domain, using a vector network analyzer (VNA) as a phase discriminator. A proof-of-concept experiment is established by an optical-controlled system with the OAM state of 1. By analyzing the experiment's results, the rotational Doppler frequency shift is measured as 24.83 Hz (max error rate 0.67%) at 50π rad/s rotational velocity, deducing the rotational velocity as 50.18π (average error rate 0.36%).
authors.forename: Mingyang
authors.initials: M
authors.lastname: Zhao
authors.forename: Xinlu
authors.initials: X
authors.lastname: Gao
authors.forename: Mutong
authors.initials: M
authors.lastname: Xie
authors.forename: Wensheng
authors.initials: W
authors.lastname: Zhai
authors.forename: Wenjing
authors.initials: W
authors.lastname: Xu
authors.forename: Shanguo
authors.initials: S
authors.lastname: Huang
authors.forename: Wanyi
authors.initials: W
authors.lastname: Gu