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Device and method for measuring atmospheric turbulence anisotropy factors based on space coherence

An atmospheric turbulent, anisotropic technology, applied in measurement devices, aerodynamic tests, clear air turbulence detection/prediction, etc., to achieve accurate results

Inactive Publication Date: 2020-10-02
XIHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, there is no method and device for measuring the anisotropy factor of atmospheric turbulence

Method used

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  • Device and method for measuring atmospheric turbulence anisotropy factors based on space coherence
  • Device and method for measuring atmospheric turbulence anisotropy factors based on space coherence

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The laser in the laser emitting device 1 in the present embodiment is a He-Ne laser, and its wavelength is 632.8nm, and the operating wavelength of the radial polarizer is 632.8nm; the optical transmitting antenna 2 is a Kepler telescope; the atmospheric turbulence is anisotropic Atmospheric turbulence; the optical receiving antenna 3 used is a Galileo telescope; the working wavelength of the polarization beam splitter prism in the space coherence measuring instrument is 632.8nm, and the CCD camera is a Baslerpilot series camera; the optical transmitting antenna 2 and the optical receiving antenna 3 are separated by z=3km .

[0044] In this embodiment, as figure 1 The structure of the experimental device is shown to realize the method of measuring the anisotropy factor of atmospheric turbulence based on the degree of spatial coherence. according to figure 1 After installing the experimental device, the linearly polarized light output by the He-Ne laser in the laser em...

Embodiment 2

[0051] In this embodiment, the laser in the laser emitting device 1 used in Embodiment 1 is replaced by a fiber laser, and its center wavelength is 1550nm, and the radial polarizer corresponding to its wavelength is replaced; the optical emitting antenna 2 is replaced by a Galileo telescope; Atmospheric turbulence is still anisotropic atmospheric turbulence; Optical receiving antenna 3 is replaced by Newtonian telescope; The polarization beam splitter prism in the space coherence measuring instrument is replaced with the corresponding prism of laser wavelength; Data processor 5 is still the same as that described in embodiment 1 the same data processor as above; then press figure 1 The structure of the experimental device is equipped with various optical components, and the other experimental steps and calculation process are the same as in Example 1, and the atmospheric turbulence anisotropy factor ξ can also be detected through the measured spatial coherence.

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Abstract

The invention relates to the field of space laser communication, in particular to a device and a method for measuring atmospheric turbulence anisotropy factors based on space coherence. The method comprises the following steps: firstly, radial polarized light generated by a laser transmitting device is collimated and expanded by an optical transmitting antenna and then is transmitted, so that theradial polarized light is received by an optical receiving antenna after passing through anisotropic atmospheric turbulence; then, the received light beams are measured through a spatial coherence measuring instrument; and finally, the anisotropy factor of the atmospheric turbulence is calculated by utilizing the measured spatial coherence degree. An experimental device for realizing the method comprises a laser transmitting device, an optical transmitting antenna, an optical receiving antenna, a spatial coherence measuring instrument and a data processor. The method is simple in structure, convenient to operate and high in universality.

Description

technical field [0001] The invention belongs to the field of space laser communication, and relates to a device and a method for measuring atmospheric turbulence anisotropy factors based on space coherence. Background technique [0002] Laser has been widely concerned by people since its birth, and has been developed and utilized in various fields. Laser has the characteristics of directivity and strong coherence, and is an excellent carrier of information. Therefore, space laser communication technology develops very rapidly. [0003] But in the ground-to-ground and ground-to-space laser communication systems, the transmission medium of the laser is random atmosphere. Particles such as gas molecules, fog, haze, and aerosols in the atmosphere will cause light absorption and scattering; what's more, the existence of atmospheric turbulence will cause light wave front distortion, beam drift, beam expansion, intensity fluctuations, and image point A series of serious atmospher...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M9/06G01W1/00
CPCG01M9/06G01W1/00G01W2001/003
Inventor 赵亮徐勇根
Owner XIHUA UNIV