Research On Turbulence Effect Induced By Acoustic Wave Fluctuation

Free space optical communication has the advantages of good confidentiality,high bandwidth,low cost and fast deployment.Therefore,the development of free optical communication has received extensive attention and achieved rapid development.Among them;as the main transmission medium of the beam,the atmospheric c.h annel will change the beam characteristics due to the turbulence effect.In order to improve the transmission performance of spatial optical communication,this paper takes acoustic waves as the research object,and artificially disturbs the atmospheric parameters through different array structure acoustic sources,thereby im proving the performance of atmospheric channel media.The numerical study is carried out to calculate the numerical relationship between the variation of different array structure acoustic parameters and the structural constant of atmospheric refractive index.The feasibility of acoustic turbulence induced by acoustic disturbance is verified by numerical simulation.The specific work includes the following points:1.Different sound field radiation models are obtained according to various sound source array structures.The point source,coherent point source,line array structure sound source factor and radiation field model,and plane sound source array factor space radiation field distribution model are studied respectively.2.The phase-screen method is used to simulate atmospheric turbulence.The effects of different propagation distances and changes in atmospheric refractive index structure constant on the laser intensity distribution are analyzed when the beam passes through the atmosphere.By fitting the data information of the spot intensity after transmission,the influence of turbulence on the beam changes under different distalces and atmospheric conditions is verified.3.The transmissiozn theory of free-space optical communic ation in atmospheric environment is introduced.By studying the disturbance of the acoustic parameters to the atmospheric environment,the numerical relationship between the variation of acoustic parameters and the refractive index structure constant of different array structures is further calculatecd.This result makes it possible for artificial disturbances to excite atmospheric turbulence effects and provide a relatively stable atmospheric environment.The results show that the radiation field distribution of the sound source is different under different array structures,and the variation of the radiation field is related to the number of sound sources,the distance between sound sources and the wavelength of sound sources waves;the variation of different transmission distances and atmospheric turbulence.It will affect the distribution of light intensity,causing distortion and fragmentation of the light spot;the sound wave disturbance will cause changes in the atmospheric environment.The structural parameters and distance changes of different arrays of sound sources will stimulate different degrees of atmospheric turbulence,and the closer to the sound source,the stronger the turbulence effect of the excitation,the purpose of the turbulence effect can be achieved by controlling the structural parameters of the sound source to achieve artificial disturbance.