Wake Flow Field Detection of Undersea Vehicles Based on Vortex Beam Propagation

In free-space diffraction, the orbital angular momentum(OAM)of the vortex light field remains unchanged. However, in a turbulent layer, the symmetry of the OAM spectrum distribution will be broken, and the OAM will change due to the existence of a quasi-ordered structure in the flow field. In this p...

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Bibliographic Details
Published in水下无人系统学报 Vol. 32; no. 5; pp. 901 - 905
Main Authors Zhichao ZHOU, Yunqing TANG, Lingfei XU, Cunfeng GU, Pingan LIU
Format Journal Article
LanguageChinese
Published Science Press (China) 01.10.2024
Subjects
cross-oam matrix
orbital angular momentum
undersea vehicle
vortex beam wake
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ISSN2096-3920
DOI10.11993/j.issn.2096-3920.2024-0076

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Summary:In free-space diffraction, the orbital angular momentum(OAM)of the vortex light field remains unchanged. However, in a turbulent layer, the symmetry of the OAM spectrum distribution will be broken, and the OAM will change due to the existence of a quasi-ordered structure in the flow field. In this paper, the mechanism of detecting the flow structure by using the symmetry breaking of OAM spectrum distribution was investigated. The feasibility of applying OAM of vortex light field to detect undersea vehicles was analyzed, and relevant test results were given. In addition, according to the characteristics that the total OAM of the light field also changes, the theoretical basis for identifying the characteristics of different flow fields based on OAM was elaborated through the cross-OAM matrix method. Lastly, the perception characteristics of the water medium of the vortex light field were studied. Combined with the results of numerical simulation, a technical concept for detecting undersea vehicles based on the
ISSN:2096-3920
DOI:10.11993/j.issn.2096-3920.2024-0076