Universal atmosphere turbulence phase screen design method based on diffractive optical element

A technology of diffractive optical elements and atmospheric turbulence, which is applied in the field of optics to achieve easy-to-achieve effects

Active Publication Date: 2015-02-25
TAIYUAN UNIV OF TECH
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  • Abstract
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Problems solved by technology

But this method can only improve the simulation accuracy of the atmospheric turbulent phase screen satisfying the Kolmogorov power spectral distribution

Method used

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  • Universal atmosphere turbulence phase screen design method based on diffractive optical element
  • Universal atmosphere turbulence phase screen design method based on diffractive optical element
  • Universal atmosphere turbulence phase screen design method based on diffractive optical element

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Embodiment Construction

[0018] For the present invention, we will describe in detail below through a process of manufacturing an actual atmospheric turbulence phase shield. This method comprises the steps as follows:

[0019] According to the actual measurement results and the manufacturing requirements of the atmospheric turbulent phase screen, we obtain the following manufacturing parameters:

[0020] Atmospheric turbulence phase screen size: 25m x 6m, relative ratio of 20 points per meter; atmospheric turbulence power spectrum distribution characteristics The minimum sampling frequency for atmospheric turbulence simulation is 0.001Hz and the maximum sampling frequency is 1000Hz; the minimum step size for searching sampling points is 0.0001; for a certain frequency range k 1 The atmospheric turbulent phase screen of the phase difference due to sampling

[0021] ϵ ( k 1 ) = {...

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Abstract

The invention discloses a universal atmosphere turbulence phase screen design method based on a diffractive optical element. The method includes the steps of firstly, determining the error range of the atmosphere turbulence phase screen according to the quantization accuracy of the diffractive optical element and the accuracy requirement in actual use; secondly, conducting sampling design on a power spectrum through an optimization algorithm according to the error range to obtain a sample sequence required for atmosphere turbulence simulation; thirdly, generating the atmosphere turbulence phase screen meeting the error accuracy requirement and the distribution requirement of any power spectrum through the combination of the sampling sequence and a sparse spectrum model of the atmosphere turbulence. By means of the method, the problem that uncontrollable errors of a traditional atmosphere turbulence phase screen based on the diffractive optical technology are caused by the random characteristic in the simulation process is solved, and the atmosphere turbulence phase screen with the power spectrum meeting any statistics rule can be produced. By means of the method, reliable atmosphere turbulence model signals can be provided for detecting various systems including the self-adaption optical system, the laser communication system and the like.

Description

technical field [0001] The invention belongs to the field of optics, and proposes an atmospheric turbulence phase screen method that uses a diffractive optical element to generate an error within a certain precision and satisfies arbitrary power spectrum distribution according to an optimal sampling method and a sparse spectrum model. It can provide a universal and reliable method for various applications such as atmospheric turbulence phase screen processing and liquid crystal atmospheric turbulence simulation. Background technique [0002] During the imaging process of large ground-based telescopes, it will be affected by the random disturbance of atmospheric turbulence. Adaptive optics systems can measure and correct for such random perturbations in real time, greatly improving the observational capabilities of telescopes. In the process of developing an adaptive optics system, due to the influence of many factors such as the service time of the telescope, the external e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M11/02
Inventor 贾鹏蔡冬梅王东
Owner TAIYUAN UNIV OF TECH
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