Method for inverting atmosphere refractive index structure constant by measuring atmosphere coherent length result

A technology of atmospheric coherence length and atmospheric refractive index, which is applied in measurement devices, phase influence characteristic measurement, image data processing, etc., can solve problems such as reducing system imaging quality, restricting the performance of wireless optical communication systems, and interrupting laser transmission links.

Inactive Publication Date: 2019-01-25
XIAN UNIV OF TECH
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Problems solved by technology

Due to the characteristics of beam expansion, drift, light intensity fluctuation and coherence degradation caused by atmospheric turbulence, the laser will be affected when it is transmitted in the atmosphere, which w

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  • Method for inverting atmosphere refractive index structure constant by measuring atmosphere coherent length result
  • Method for inverting atmosphere refractive index structure constant by measuring atmosphere coherent length result
  • Method for inverting atmosphere refractive index structure constant by measuring atmosphere coherent length result

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Embodiment Construction

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0034] Step 1. Design a set of differential image motion method to measure the atmospheric coherence length system to detect the fluctuation of the arrival angle caused by the wavefront distortion;

[0035] figure 1 It is a schematic diagram of the laser spot image acquisition system, which is composed of a laser, a transmitting module, a receiving module and a computer terminal; the laser emitted by the laser with a wavelength of 650nm is divided into four beams by the telescope at the transmitting end and transmitted for a certain distance in the atmosphere. The camera collects the differential motion image of the laser beam propagating through the atmosphere from a fixed position;

[0036] Step 2. Obtain multiple single-frame short-exposure differential motion s...

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Abstract

The invention discloses a method for inverting an atmosphere refractive index structure constant by measuring an atmosphere coherent length result. The method comprises the steps of designing a systemfor measuring atmosphere coherent length by a differential image motion method to detect fluctuation of an arrival angle caused by wavefront distortion; obtaining a plurality of single-frame short-exposure differential motion light spot images at an image surface of a receiving end by a measurement system; processing the acquired images by software to obtain jitter variance Sigma <2><t> and Sigma<2><t> of two arbitrary light spot mass centers in a horizontal direction and a vertical direction, and calculating atmosphere coherent length values r0 in different directions according to a formula;4, counting the atmosphere coherent length values r0 in different directions in the step 3 to solve an atmosphere coherent length measurement value averagely acquired at a current moment; and 5, reverting a value of the atmosphere refractive index structure constant C<2><n> according to a measurement value in the step 4. By the method, the turbulence strength change in an atmosphere channel can be measured and analyzed by calculating the atmosphere refractive index structure constant.

Description

technical field [0001] The invention belongs to the technical field of wireless laser communication, and relates to a method for reversing the atmospheric refractive index structural constant by using the result of measuring atmospheric coherence length. Background technique [0002] Wireless laser communication, also known as free space optical communication, is a two-way communication technology that realizes point-to-point, point-to-multipoint or multipoint-to-multipoint through laser in an atmospheric channel. Due to the characteristics of beam expansion, drift, light intensity fluctuation and coherence degradation caused by atmospheric turbulence, the laser will be affected when it is transmitted in the atmosphere, which will reduce the imaging quality of the system and restrict the performance of the wireless optical communication system. In severe cases, it will cause laser damage. Disruption of the transmission link. For long-distance transmission, the influence of ...

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Application Information

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IPC IPC(8): G01N21/41G06T7/136G06T7/66
CPCG01N21/41G01N2021/4106G06T7/136G06T7/66
Inventor 吴鹏飞贾璐瑶张启东李腾
Owner XIAN UNIV OF TECH
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