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Path profile approximation measurement method of refractive index structure constant of atmospheric turbulence

A technique of atmospheric turbulence and structural constants, which is applied in the measurement of phase influence characteristics, electrical digital data processing, special data processing applications, etc., and can solve problems such as high cost and troublesome implementation.

Active Publication Date: 2019-02-15
CHANGCHUN UNIV OF SCI & TECH
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Problems solved by technology

However, this method is costly on the one hand and cumbersome to implement on the other hand

Method used

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  • Path profile approximation measurement method of refractive index structure constant of atmospheric turbulence
  • Path profile approximation measurement method of refractive index structure constant of atmospheric turbulence
  • Path profile approximation measurement method of refractive index structure constant of atmospheric turbulence

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Embodiment Construction

[0048] In order to make the features and advantages of the method more clear, the method will be further described below in conjunction with specific embodiments. In the present embodiment, the first laser (101) selects a semiconductor laser with a wavelength of 808nm, and the second laser (201) selects a semiconductor laser with a wavelength of 793nm, and these two wavelengths all belong to the 800nm ​​wave band; the first CCD detector (106 ) and the output frame rate of the second CCD detector (206) are set to 1000Hz, and the first computer (107) and the second computer (207) collect 30000 frames of spot images continuously respectively to realize the statistics of light intensity fluctuation variance and arrival angle fluctuation variance calculate.

[0049] The technical scheme of this method is realized as follows: an approximate measurement method for the path profile of the atmospheric turbulent refractive index structure constant, which is characterized in that: firstl...

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Abstract

The invention discloses a path profile approximation measurement method of a refractive index structure constant of an atmospheric turbulence. According to the path profile approximation measurement method, a transmission path is divided into three segments, namely, a segment close to a transceiver A, a middle segment and a segment close to a transceiver B, and three discrete random phase screensare used for approximately describing the continuous atmospheric turbulence. By the path profile approximation measurement method, the effective refractive index structure constant of each random phase screen is obtained by measuring light wave intensity fluctuation and arrival angle fluctuation of a two-way transmission channel so as to describe general change characteristics of the refractive index structure constant of the atmospheric turbulence along the transmission path, so that a reference is provided for design of a light wave atmospheric transmission engineering system.

Description

technical field [0001] The invention belongs to the technical field of atmospheric channel optical signal transmission, and relates to an approximate measurement method for atmospheric turbulent refractive index structure constant path profile. Background technique [0002] Light intensity scintillation and angle of arrival fluctuations will occur when the laser is transmitted through atmospheric turbulence, which usually have a negative impact on the laser atmospheric transmission engineering system. Before designing the laser atmospheric transmission engineering system, it is often necessary to estimate the influence of atmospheric turbulence. The structural constant of the refractive index is a key parameter for calculating the statistics of light waves propagating in atmospheric turbulence. For horizontal transmission near the ground, due to the lack of path profile data of the refractive index structure constant, many times in theoretical calculations, it can only be a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/41G06F17/50
CPCG01N21/41G06F30/20
Inventor 陈纯毅杨华民蒋振刚倪小龙潘石刘智
Owner CHANGCHUN UNIV OF SCI & TECH
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