Imaging detection is an important means to obtain target information.The traditional imaging detection technology mainly collects the intensity information and spectral information of the target to realize the classif...Imaging detection is an important means to obtain target information.The traditional imaging detection technology mainly collects the intensity information and spectral information of the target to realize the classification of the target.In practical applications,due to the mixed scenario,it is difficult to meet the needs of target recognition.Compared with intensity detection,the method of polarization detection can effectively enhance the accuracy of ground object target recognition(such as the camouflage target).In this paper,the reflection mechanism of the target surface is studied from the microscopic point of view,and the polarization characteristic model is established to express the relationship between the polarization state of the reflected signal and the target surface parameters.The polarization characteristic test experiment is carried out,and the target surface parameters are retrieved using the experimental data.The results show that the degree of polarization(DOP)is closely related to the detection zenith angle and azimuth angle.The(DOP)of the target is the smallest in the direction of light source incidence and the largest in the direction of specular reflection.Different materials have different polarization characteristics.By comparing their DOP,target classification can be achieved.展开更多
The characteristics of reflected light of a 1-D guided-mode resonance filter(GMRF)are studied in this paper.A triple-layer GMRF is designed by using the finite difference time domain method under non-polarized light i...The characteristics of reflected light of a 1-D guided-mode resonance filter(GMRF)are studied in this paper.A triple-layer GMRF is designed by using the finite difference time domain method under non-polarized light illumination.Numerical results show that the reflectance spectra of TE and TM polarizations can be changed by altering the fill factor f of the GMRF.Moreover,by calculating the color of the reflected light with the chromaticity theory,we find that the color of reflected light becomes pure when f is 0.9.The results show that the color and polarization degree of the reflected light of a GMRF are tunable by altering the fill factor.展开更多
为提高天空偏振模式探测的稳定性,该文通过分析天空偏振光分布模式和Stokes矢量解析模型,设计了一种基于三目偏振相机的天空偏振模式探测试验装置。该装置克服了传统的天空偏振模式探测装置低效和密封性差的问题,适用于雨天和海面的偏...为提高天空偏振模式探测的稳定性,该文通过分析天空偏振光分布模式和Stokes矢量解析模型,设计了一种基于三目偏振相机的天空偏振模式探测试验装置。该装置克服了传统的天空偏振模式探测装置低效和密封性差的问题,适用于雨天和海面的偏振光探测工作。三目偏振相机的偏振角度为0°、60°、120°,通过求解Stokes矢量解可求出目标观测点处的偏振度(degree of polarization,DOP)和偏振方位角(angle of polarized elevation,AOE),分析了天空偏振模式图中AOE和DOP的分布规律。实验结果表明DOP和AOE关于中性点呈有规律的对称分布,该装置能有效探测天空偏振模式,为偏振导航技术提供有力的技术支持。展开更多
基金supported by the National Key Laboratory of Electromagnetic Space Security(JCKY2023230C009).
文摘Imaging detection is an important means to obtain target information.The traditional imaging detection technology mainly collects the intensity information and spectral information of the target to realize the classification of the target.In practical applications,due to the mixed scenario,it is difficult to meet the needs of target recognition.Compared with intensity detection,the method of polarization detection can effectively enhance the accuracy of ground object target recognition(such as the camouflage target).In this paper,the reflection mechanism of the target surface is studied from the microscopic point of view,and the polarization characteristic model is established to express the relationship between the polarization state of the reflected signal and the target surface parameters.The polarization characteristic test experiment is carried out,and the target surface parameters are retrieved using the experimental data.The results show that the degree of polarization(DOP)is closely related to the detection zenith angle and azimuth angle.The(DOP)of the target is the smallest in the direction of light source incidence and the largest in the direction of specular reflection.Different materials have different polarization characteristics.By comparing their DOP,target classification can be achieved.
基金National Natural Science Foundation of China (61605035)
文摘The characteristics of reflected light of a 1-D guided-mode resonance filter(GMRF)are studied in this paper.A triple-layer GMRF is designed by using the finite difference time domain method under non-polarized light illumination.Numerical results show that the reflectance spectra of TE and TM polarizations can be changed by altering the fill factor f of the GMRF.Moreover,by calculating the color of the reflected light with the chromaticity theory,we find that the color of reflected light becomes pure when f is 0.9.The results show that the color and polarization degree of the reflected light of a GMRF are tunable by altering the fill factor.
文摘为提高天空偏振模式探测的稳定性,该文通过分析天空偏振光分布模式和Stokes矢量解析模型,设计了一种基于三目偏振相机的天空偏振模式探测试验装置。该装置克服了传统的天空偏振模式探测装置低效和密封性差的问题,适用于雨天和海面的偏振光探测工作。三目偏振相机的偏振角度为0°、60°、120°,通过求解Stokes矢量解可求出目标观测点处的偏振度(degree of polarization,DOP)和偏振方位角(angle of polarized elevation,AOE),分析了天空偏振模式图中AOE和DOP的分布规律。实验结果表明DOP和AOE关于中性点呈有规律的对称分布,该装置能有效探测天空偏振模式,为偏振导航技术提供有力的技术支持。
