Error Analysis And Experimental Verification Study Of Full Polarization Imaging Optical System Based On Division Of Amplitude And Polarization

The polarization remote sensing measurement can obtain more abundant optical information and has shown important value in various fields.The accuracy of polarization measurement depends on the precision of the development of the polarization measurement system.It is a research hotspot to develop the high-precision polarization measurement system.The errors of the key parameters in the polarization measurement system have an important influence on the polarization measurement accuracy.Studying the mechanism of the influence of the system parameter errors on the polarization measurement accuracy will help us to eliminate or reduce the influence of the system parameter errors on the polarization measurement accuracy and provide the theoretical basis for the parameter design and the development of the polarization measurement system.The error analysis and experimental verification research of the polarization measurement system have high academic value and application value.The full polarization imaging system based on division of amplitude and polarization has prominent merits,such as high spatial resolution,high precision,real time and so on.The full polarization imaging system based on division of amplitude and polarization has high application value.For the full polarization imaging system based on division of amplitude and polarization,the domestic and foreign scholars only simulated and analyzed the influence of the fast-axis angular errors of the wave plates and the error of the splitting ratio of the partial polarization beam splitter on the polarization measurement error.However,in the process of the evaluation of system polarization measurement accuracy,the influence of the change of the elliptic angle of the incident light on the system polarization measurement accuracy was not considered.The existing evaluation method of the system polarization measurement accuracy is not perfect.The optimization method of the system performance,the analysis of the influence of other key errors of the system on the polarization measurement accuracy,the analysis of the influence of the coupling errors of the key parameters of the system on the polarization measurement accuracy and the experimental verification research of the analysis results have not been reported in related literature.Therefore,for the full polarization imaging system based on division of amplitude and polarization,this paper mainly studies the optimization method of the system performance.By analyzing the influence of the key errors of the system on the polarization measurement accuracy,a perfect evaluation method of the system polarization measurement accuracy is proposed.The influence of the coupling errors of the key parameters of the system on the polarization measurement accuracy is analyzed.The correctness of the system error model and the analysis results of the coupling errors of the key parameters of the system is verified by the experimental verification method.The specific research contents are as follows:In this paper,based on the polarization measurement principle of the full polarization imaging system based on division of amplitude and polarization,an error model is established.An optimization method of the system performance is proposed.The optimization method of the system performance can effectively reduce the influence of the fast-axis alignment errors of the wave plates on the polarization measurement accuracy by optimizing the splitting ratio of the partial polarization beam splitter in the system.The simulation results of the system performance optimization show that when the condition number of the measurement matrix of the system is less than 1.84,selecting the splitting ratio of 0.772/0.228 can make the alignment errors of the wave plates have the least influence on the polarization measurement accuracy.The optimal theoretical design parameters of the system are obtained.An evaluation method for the system polarization measurement accuracy is proposed.The effect of the key errors of the system on polarization measurement error is simulated when the Stokes vectors with different degrees of polarization(DOP),different polarization angles and different elliptic angles used as incident lights.The error model analysis results show that the greater the DOP is,the greater polarization measurement error will be.We select the polarization measurement accuracy when the DOP equals to 1 to evaluate the system.Using the evaluation method for the system polarization measurement accuracy,the influence of the key errors of the system,such as the alignment errors of the half wave plate and the quarter wave plate,the phase delay errors of the half wave plate and the quarter wave plate and the errors of the splitting ratios of the polarization beam splitters in the system,on the polarization measurement error is analyzed.The influence of the coupling error of the above system parameters on the polarization measurement error is studied.The error tolerances of the key parameters in the system are given,which provides a theoretical basis for the system alignment and development.The system error model established in this paper is experimentally verified.The experimental results show that the experimental results are in good agreement with the simulation results calculated by the system error model,which verifies the correctness of the system error model.An imaging experimental optical path is built.And a small field of view optical lens is added to the imaging experimental optical path.The polarization characteristics of the optical lens is measured.The experimental results show that the deviations caused by the lens to the incident light Stokes vectors and the degrees of polarization are not more than 2.6×10-4.Compared with the polarization measurement accuracy which is required better than 2%,the polarization characteristics of the optical lens can be neglected.The analysis results of the coupling errors of the key parameters of the system are verified by the imaging experimental optical path.The experimental results show that the experimental results are in good agreement with the analysis results of the coupling errors of the system.The correctness of the analysis results of the coupling errors of the system is verified.The content of this paper can provide an important scientific basis for the development of the full polarization imaging system based on division of amplitude and polarization.