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Method and device for determining atmospheric turbulence parameter based on M<2> factor and light scintillation index

A technology of atmospheric turbulence and light flickering, applied in the direction of using optical devices, measurement devices, electrical components, etc., can solve the problems of complex measurement system, low scattering efficiency, and weak scattered light intensity.

Inactive Publication Date: 2011-02-23
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the low scattering efficiency of atmospheric molecules, the intensity of scattered light is very weak, so this method requires high-sensitivity low-light detection technology, and the measurement system is complex; at the same time, it is also limited by weak fluctuation conditions
In addition, some lidar measurements of atmospheric turbulence parameters are based on the turbulent isotropy and stationarity assumptions of the radar equation, which are difficult to satisfy in the actual atmosphere. The form of the radar equation itself needs to be further improved, and this method is still in its preliminary state Exploration stage

Method used

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  • Method and device for determining atmospheric turbulence parameter based on M&lt;2&gt; factor and light scintillation index
  • Method and device for determining atmospheric turbulence parameter based on M&lt;2&gt; factor and light scintillation index
  • Method and device for determining atmospheric turbulence parameter based on M&lt;2&gt; factor and light scintillation index

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Embodiment 1

[0055] Laser device 1 used in the present embodiment is Nd: YAG laser device, and its wavelength is 1064nm; Optical transmitting antenna 2 is a Kepler telescope; Beamer 4 is a beam splitter with an operating wavelength of 1064nm, which is the same as the used Nd:YAG laser 1 wavelength; M 2 Factor Meter 5 for ModeMaster PC Type M 2 The factor measuring instrument; the light scintillation index measuring instrument 6 is a LAS / XLAS large aperture scintillation instrument; the distance between the optical transmitting antenna 2 and the optical receiving antenna 3 used is L=2km.

[0056] In this embodiment, as figure 1 The structure of the experimental setup is shown to realize the M-based 2 factor and light scintillation index to determine the method of atmospheric turbulence parameters. according to figure 1 The structure of the experimental device is equipped with each optical element, and its optical path process is described: the Nd:YAG laser 1 outputs a completely coheren...

Embodiment 2

[0070] In this embodiment, the laser 1 used in Embodiment 1 is replaced by a fiber laser, and its center wavelength is 1550nm; the optical transmitting antenna 2 is replaced by a Galileo telescope; the atmospheric turbulence is still uniformly distributed atmospheric turbulence; the optical receiving antenna 3 is replaced by a Newtonian telescope , the beam splitter 4 is replaced by a beam splitter whose working wavelength is 1550nm, M 2 Factor Meter 5 Replacement with M2-200 Series M 2 Factor measurement system, optical scintillation index measuring instrument 6 is replaced by BLS450 large-diameter scintillator, and data processor 7 is still the same as the data processor described in embodiment 1; then press figure 1 The structure of the experimental device is installed with each optical element, and the other operating experimental steps and calculation process are the same as in Example 1, and the M obtained by measurement can also be obtained 2 Atmospheric Turbulence Ref...

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Abstract

The invention relates to a method for determining an atmospheric turbulence parameter based on measurement of an M<2> factor and a light scintillation index and an experimental apparatus thereof, and belongs to the field of laser space communication. The method comprises the following steps of: performing collimating and beam-expanding on a Gaussian beam emitted by a laser by an optical transmitting antenna and transmitting, allowing the emitted Gaussian collimated beam to pass through atmospheric turbulence and receiving the emitted Gaussian collimated beam by an optical receiving antenna; splitting the received beam into two beams, of which one passes through an M<2> factor measuring apparatus and the other path passes through a light scintillation measuring apparatus; and finally determining the atmospheric turbulence parameter by using the measured M<2> factor and light scintillation index. The experimental apparatus for implementing the method comprises the laser, the optical transmitting antenna, the optical receiving antenna, a beam splitter, the M<2> factor measuring apparatus, the light scintillation measuring apparatus and a data processor. Through the method and the experimental apparatus of the invention, the atmospheric turbulence refractive index structure constant and scale parameter in the atmospheric turbulence are determined, and the experimental apparatus has a simple structure and is convenient to operate and measure.

Description

technical field [0001] The invention belongs to the field of space laser communication, in particular to a method of measuring beam transmission factor (M 2 factor) and light scintillation index to determine atmospheric turbulence parameters, and an experimental setup for implementing said method. Background technique [0002] Since the emergence of lasers, space laser communication technology and atmospheric laser communication technology have developed rapidly. People have carried out experimental studies such as theory, simulation, key technology research and demonstration on interstellar, star-to-earth, air-to-air and other laser links. Atmospheric turbulence is a kind of inhomogeneous random medium, which can usually be regarded as a collection of turbulent eddies with various scales of refractive index. However, when the laser wavefront passes through the atmospheric turbulence, it interacts with the turbulent eddies, resulting in such as beam drift, beam Various tur...

Claims

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Application Information

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IPC IPC(8): G01B11/00G01N21/41H04B10/10G01N21/17G01W1/00H04B10/11
Inventor 张彬但有全潘平平齐娜
Owner SICHUAN UNIV
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