The Influence Of Dust Particles On The Attenuation Characteristic Of The Optical Transmission Of Plasma

The components of dusty plasma include neutral particles, electrons, ions and usually negatively charged dust particles. Charged particles have different dynamical behaviors compared with electrons and ions, and their interaction with background plasma presents a lot of new physical phenomena. This paper will focus on studying its attenuation characteristics of optical transmission.First of all, based on the summary of the three existing conductivity models, the fourth models are derived on considering the influence of particle velocity. Then, the corresponding attenuation coefficient is obtained based on the relationship between electrical conductivity and dielectric constant. Theoretical derivation shows that the conductivity and attenuation coefficient are both the function of temperature, pressure and detective frequency. Finally, two typical dusty plasmas with weak and strong ionization are chosen for research, and the attenuation characteristics are analyzed in the range of the given temperature, pressure and detection frequency.Taking the rocket jet as an example of weak ionization dusty plasma, the results show that:l) The attenuation coefficient has a critical value with temperature and pressure, when in the low frequency of microwave band, and the corresponding attenuation coefficient produces a trough; 2) the attenuation peaks appears near the dusty plasma resonant frequency. The distance between the position of the peak value and the resonant frequency is determined by the effect of the temperature and pressure on resonance frequency; 3) Considering the particle velocity, the model will not affect the attenuation coefficient with the change of temperature, pressure and the frequency of the incident, but the numerical change; and in a certain range, the greater the particle velocity, the weaker the attenuation.At the same time, taking the weak ionization of the argon arc plasma as an example for the improvement of research. The results show that:1) The attenuation coefficient increases with the increase of temperature and pressure in a given wavelength range.2) when the temperature and pressure are constant, the attenuation coefficient increases with the increase of the wavelength.3) after considering the flow velocity, Same with weak ionization.In conclusion, the related research work is expected to use in 3-D full display of dust particles in the plasma flow field, and the key parameters can support the optical measurements. It also provides valuable reference for the analysis of the feasibility of the application of optical communication technology in this kind of complex medium.