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Azimuth angle measurement method based on vortex beam OAM phase spectrum

A measurement method, vortex beam technology, applied in the direction of measuring devices, optical devices, instruments, etc., can solve the problem of difficulty in extracting target azimuth angle information, and achieve the effect of small calculation, high resolution and super high resolution

Pending Publication Date: 2022-06-28
PLA PEOPLES LIBERATION ARMY OF CHINA STRATEGIC SUPPORT FORCE AEROSPACE ENG UNIV
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Problems solved by technology

[0005] The technical problem of the present invention is: Aiming at the difficulty of extracting target azimuth information, a method for azimuth measurement based on vortex beam OAM phase spectrum is proposed

Method used

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  • Azimuth angle measurement method based on vortex beam OAM phase spectrum
  • Azimuth angle measurement method based on vortex beam OAM phase spectrum
  • Azimuth angle measurement method based on vortex beam OAM phase spectrum

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[0037] specific implementation

[0038] The present invention uses the Bessel Gaussian beam as the detection information carrier, and the schematic diagram of the azimuth angle measurement is as follows: Image 6 The specific implementation steps are as follows:

[0039]The stable Gaussian light is generated by the laser generator resonator (1), and firstly transmitted through the linear polarizer (2) to obtain pure horizontally polarized light that matches the diffraction direction of the spatial light modulator (SLM). The polarizer makes the polarization state of the light uniform, which can ensure that the light has good coherence. The beam expansion and collimation system composed of the lens (3) and the lens (4) is then irradiated to the spatial light modulator (5), the phase mask is loaded on the spatial light modulator, and after complex amplitude modulation is performed, the outgoing light is The coaxial interference beam of Sel Gauss and the plane light passes throu...

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Abstract

The invention relates to an azimuth angle measurement method based on a vortex beam OAM phase spectrum. The vortex light beam is a novel structure light field with a spiral wave front, and due to the fact that the vortex light beam carries orbital angular momentum (OAM) information, compared with a traditional light beam, the vortex light beam has the higher-dimension information modulation freedom degree. The angular momentum and the angular position form a pair of conjugate variables which can be associated through discrete Fourier transform. The spiral phases of scattered light of a target under different orbital angular momentums are calculated by using a four-step phase shift method, the spiral phases of the scattered light under different orbital angular momentums form an OAM phase spectrum, and Fourier transform is performed on the OAM phase spectrum in an OAM domain, so that the azimuth angle of the target can be quickly and conveniently calculated. The resolution ratio is inversely proportional to the scanning range of the OAM, and the larger the scanning range of the OAM is, the higher the resolution ratio is. The method is suitable for measuring azimuth angles of a single target or multiple targets, and can be used for one-dimensional imaging of the target.

Description

technical field [0001] The invention relates to an azimuth angle measurement method based on the vortex beam OAM phase spectrum. Vortex light is a special light field with a helical wavefront. Through the interaction of the vortex beam with the target, the azimuth angle of the target can be obtained from the phase information in the scattered light. The method has the advantages of simple optical path and strong flexibility, belongs to the field of vortex light detection, and can be used for one-dimensional imaging of a target. [0002] technical background [0003] A vortex beam is a ring-shaped structured light field with a helical wavefront and a central phase singularity. In 1992, L.Allen et al. discovered an important property of vortex beams: they have a phase factor under paraxial conditions. The vortex beam has orbital angular momentum (OAM) where l is the topological charge number, to reduce Planck's constant, is the azimuth angle. Any two vortex beams with...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/26
CPCG01B11/26
Inventor 任元徐莉园陈琳琳刘通刘政良陈晓岑王祎宁
Owner PLA PEOPLES LIBERATION ARMY OF CHINA STRATEGIC SUPPORT FORCE AEROSPACE ENG UNIV