Design And Development Of Real-time Imaging System Of Polarized Skylight Pattern Of Full Polarization

Atmospheric polarization mode is an inherent property of the sky,it is a stable distribution of polarized skylight in the atmosphere,which contains rich information of time and space.Therefore,the study of atmospheric polarization mode has important theoretical and application significance for the research of animal navigation behavior,atmospheric characteristics,surface environmental characteristics,and bionics polarized light navigation.Therefore,the distribution of atmospheric polarization pattern has important research value.According to the research needs of atmospheric polarization pattern distribution,the thesis has developed a set of atmospheric polarization mode full polarization measurement imaging system and carried out related experimental research.The main research work is as follows:(1)The design and simulation of the imaging system of polarized skylight pattern of full polarization was carried out.The fisheye lens,relay lens,and macro lens were optically simulated,the optical distance between the lenses was determined,and the optimal imaging of the simulation system was realized by using ZEMAX.Aiming at the influence of the operating equipment on the full polarization acquisition experiment,this thesis uses a high-precision piezoelectric resonant rotator to control the rotation of the quarter-wave plate,and developed an imaging system control software based on MFC to achieve the control of quarter-wave plate,camera,and the real-time acquisition and display of polarization information.(2)Aiming at the problem that the polarization information acquired by the system is susceptible to noise due to the "ill-conditioned" situation of the system transmission matrix,this thesis used the condition number analysis method to analyze the condition number and determinant of the system transmission matrix,and obtained the constraint conditions of the solution of the transmission matrix.The objective function to solve the transfer matrix is established.By transforming the problem of solving the optimal transmission matrix into a multi-condition extreme value problem,the optimal angle of the transfer matrix under the constraint conditions is determined,and the optimal transmission matrix of the system is obtained.In addition,calibration work was carried out on the optimized system.(3)In this article,we carried out an external field full polarization information acquisition experiment,and verified the effectiveness of the system by comparing the Aop and Dop of the sunny day experiment with the Rayleigh simulation results.By analyzing the full polarization information distribution of the whole day under sunny and cloudy,the variation trend of the error of Dop and Dolp over time under different weather was studied.And then the distribution of the positive and negative values and the change in the mean value of the V component of the Stokes vector of polarized skylight and the Docp of polarized skylight pattern under sunny and cloudy weather were analyzed.The results show that the V component and Docp have a certain similarity,but there are also differences.At the same time,it is found that the mean value of Docp is relatively stable regardless of whether it is sunny or cloudy and fluctuates up and down around zero.