Observation of the rotational Doppler shift of a spinning object based on an acoustic vortex with a Fresnel-spiral zone plate

It has been demonstrated that sound waves carrying orbital angular momentum undergo frequency modulation after being reflected by a rotating object. In this paper, we, observed the rotational Doppler shift phenomenon of the acoustic vortex in an underwater environment by using a Fresnel-spiral zone...

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Bibliographic Details
Published in:Journal of applied physics 2023-03, Vol.133 (11)
Main Authors: Cheng, Zheng-Kun, Luo, Ming-Cheng, Sun, Xiao-Yu, Chen, Ming, Zhang, Yi, Li, Sheng-Quan, Zhu, Xiao-Chun
Format: Article
Language:English
Subjects:
Angular momentum
Applied physics
Autonomous underwater vehicles
Controllability
Doppler effect
Frequency modulation
Frequency shift
Propellers
Sound waves
Topology
Underwater acoustics
Underwater construction
Vortices
Zone plates
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Summary:It has been demonstrated that sound waves carrying orbital angular momentum undergo frequency modulation after being reflected by a rotating object. In this paper, we, observed the rotational Doppler shift phenomenon of the acoustic vortex in an underwater environment by using a Fresnel-spiral zone plate for the construction of the focused acoustic vortex with controllable topological charge. The positive and negative rotation speeds of the spinning object are precisely determined with the rotational frequency shift and the acoustic vortex's topological charge. The rotational Doppler effect of acoustic vortex provides a possibility to improve the detection and recognition accuracy of Autonomous Underwater Vehicles with propellers.
ISSN:0021-8979
1089-7550
DOI:10.1063/5.0141106