Optimization Of Polarization Characteristics Parameters Of Full Polarization Imaging Spectrometer

Spectro-Polarimeter Imaging(SPI)is a new optical imaging technique that combines spectroscopic imaging and polarimetric imaging.SPI can obtain multidimensional information of the target while measuring the target,which enables more effective evaluation and identification of the target.In recent years,SPI technology has been initially applied in the fields of medical imaging,resource surveying,agricultural exploration,etc.The prospect and application value of this technology have attracted the attention of researchers at home and abroad.Since the performance of the polarization spectroscopy system directly affects the ability to detect the spatial and polarization characteristics of the target,factors such as manufacturing errors of polarization components,alignment errors and noise can lead to poor polarization measurement performance.How to improve the performance of polarization detection systems has become the focus of research in the field of polarization,and optimizing the parameter configuration of polarization components can help reduce the sensitivity of the system to parameter errors and noise and other influencing factors,which can effectively improve the measurement performance of polarization systems.The full polarization spectral imaging system based on dual LCVR and AOTF has the advantages of high spatial resolution,high spectral resolution,no mechanical moving parts,and fast response.By studying how the system works,it was found that the existing optimization strategies are not fully applicable to this imaging system.Therefore,for this polarization spectral imaging system,this paper proposes a more complete optimization strategy to optimize the polarization element parameters in the system,and verifies the correctness of the optimal polarization element parameters of the full polarization spectral imaging system based on the dual LCVR and AOTF through the Bonga sphere method and the noise-resistant simulation experimental method,and analyzes the tolerance range of the optimal polarization element parameters through the error simulation experiment,the specific studies are as follows.(1)The basic principle of LCVR-based full polarization spectrometer is studied.The measurement matrices of single-channel dual LCVR-type and dual-channel single LCVRtype polarization(spectrometer)instruments and the light intensity calculation formulae are derived from the Stokes vector method measurement principle.Different types of LCVRbased Stokes polarization instruments are studied and evaluated by the evaluation indexes commonly used for polarization measurement systems Analysis.(2)A more complete optimization strategy is proposed for the working principle of Stokes polarization spectrometer based on dual LCVR and AOTF.In order to better utilize the advantages of the system electrical tuning,this paper chooses to perform the polarization measurement at the minimum number of samples N=4.In order to reduce the sensitivity of the Stokes polarization spectrometer system based on LCVR and AOTF to errors and noises,a genetic algorithm is used to search for the optimum step by step;the optimization ability of the phase delay amount δ and azimuth angle θ of LCVR is explored to seek for the polarization device The optimal value of the LCVR with the minimum number of phase delay adjustments and types is investigated.(3)The optimal results are verified by the Poincare sphere method.The optimal angle corresponds to a tetrahedral volume closer to the ideal value,with a difference of only about0.1‰ from the ortho-tetrahedral volume.The anti-noise experimental analysis characterizes the performance of the optimal angle.The simulation results show that the optimized system is less sensitive to errors and noise when the incident light of different polarization states is obtained under the same Gaussian noise for the target Stokes parameter.The optimal angle can effectively suppress the effects of noise and mounting errors and enhance the system’s stability when there are error sources.The tolerance analysis gives the tolerance range of the optimal angle.This paper’s optimization strategy and optimal results provide a meaningful methodological reference for developing a Stokes polarization spectrometer based on dual LCVR with AOTF.