Experimental Investigation Of Forward Polarization Transmission Characteristics Of Light In Mie Scattering Environments

Human research on optics has never stopped since ancient times.With the continuous deepening of human's cognition to optics,humans have discovered the polarization properties of light and seen its potential application value.Consequently,polarization technology came into being,people apply it to various industries and have achieved good results.However,polarization technology has encountered a big bottleneck in innovation and development.In addition to the imperfection of current theories,the immaturity of experimental exploration technology is also the main influencing factor.Therefore,the development and improvement of experimental exploration technology is of great significance for the development of polarization applications.As a key point that can promote the development of polarization technology,the study of polarization characteristics of light in scattering environments has received the attention of research institutions in various countries in recent years.This paper focuses on the research of polarization state persistence of light transmitting in Mie scattering environments.The purpose is to verify the correctness of related theoretical results,find problems in theoretical research,and to promote the further development of related theoretical research.We have carried out the following research in this paper.(1)Aiming at the problems of the Stokes parameter used as polarization state persistence evaluation parameter in most studies,a new method of evaluation of polarization information retention is proposed.The definition of Stokes parameter involves the intensity difference between different polarization states,which makes it unable to accurately describe the content of the initial polarization information in light.The new method adopted can effectively avoid the errors introduced by the calculation of the orthogonal intensity difference,has higher accuracy than the Stokes parameter.Compared with Stokes parameters,the evaluation accuracy of new parameters can generally be improved by more than 10%,in some occasions,the evaluation accuracy can be increased by about 20%,which confirms that the new evaluation method is more reasonable and superior.(2)We use the new evaluation method to experimentally investigate the polarization information retention of light transmitting in underwater Mie scattering environments.The polystyrene microsphere suspensions were selected as the scattering environments in our experiment because of its excellent concentration controllability and particle size controllability.Varying the concentration and particle size,we compare the polarization state persistence of light with different polarization types and different wavelengths.The following researches are involved: The comparison of polarization state persistence between 532 nm linearly polarized light and 532 nm circularly polarized light;the comparison of polarizationstate persistence between 473 nm,532 nm and 671 nm linearly polarized light.We analyze and discuss the experimental results,summarizing the general regulation of the influence of particle concentration in scattering environment,wavelength and polarization type of light on the retention of polarization information.(3)We also compared the polarization state persistence between visible and near-infrared linearly polarized light transmitting in smoke environment.We used the smoke cake to create the wet smoke environments with peak particle size of 0.6 ?m.The effect of wavelength on the retention of polarization information is summarized through experiments results.