空間調制型全偏振成像系統(tǒng)關鍵誤差分析與性能優(yōu)化研究
[Abstract]:The polarization imaging system can not only obtain the two-dimensional light intensity distribution information of the target, but also obtain the polarization information corresponding to the target light intensity distribution, that is, the Stokes vector information. The Stokes vector information has the ability to enhance the contrast of the target. Targets can be highlighted from complex background information. The traditional polarization imaging system contains mechanical rotation components, which need to be collected several times in time to obtain the complete Stokes vector information of the target, so it is difficult to observe the polarization information of moving targets. The spatial modulation full polarization imaging system uses the wedge or Savart polarizer as the spatial modulation module, modulates the four parameters of the Stokes vector S0 / S1 / S2 / S3 onto the carrier at different frequencies. Thus, the interference pattern containing Stokes vector information can be obtained by a single acquisition at the same time. Compared with the traditional polarization imaging system, the spatial modulation full polarization imaging system has the advantages of simple structure and easy realization. Therefore, spatial modulation full polarization imaging system will be widely used in remote sensing, military and biomedical fields. In the practical engineering application, the system error will inevitably affect the Stokes vector measurement accuracy of the spatial modulation full polarization imaging system. The angle error of rotation half-wave plate and polarizer is the key error of the system, and they have an important influence on the precision of polarization measurement. In this paper, the adjustment angle error model of spatial modulation full polarization imaging system is presented. The matrix error model based on spatial demodulation algorithm is constructed to analyze the influence of the angle error of the mounting angle. The different polarization states of the incident light are selected by the Poincare sphere sampling method, and the angle errors of the rotating half-wave plate are respectively adjusted. The influence of the angle error and coupling angle error of the polarizer on the precision of polarization measurement is verified by simulation and the simulation results are analyzed. In this paper, a performance optimization method based on the condition number of the measurement matrix is proposed. The method obtains the optimal system by finding the measurement matrix of the minimum condition number. The results show that the condition number of the system measurement matrix is related to the thickness of Savart veneer. The system with Savart veneer thickness of 6mm / 10mm / 12mm / 23mm and 25mm is tested by simulation. It is found that when the thickness of Savart veneer is 23mm, the minimum value of measuring matrix condition is 2.06, and the influence of adjustment angle error on the system is the least. Therefore, the optimization method based on the condition number of measurement matrix can improve the performance of the system. However, this method has some limitations. The limitation of optimization method is studied by norm compatibility theorem, and the analytical results are given. In order to verify the effectiveness of the conditional number based optimization method, a complete system measurement error representation method, called Stokes basis vector method, is proposed. By using this method, the measurement errors of four ground state polarized light, namely, natural light, 0 擄/ 90 擄line polarized light, 45 擄/ 135 擄line polarized light and left / right circularly polarized light, need to be detected. The precision of polarization measurement of spatial modulation full polarization imaging system with angle error can be solved.
【學位授予單位】:中國科學技術大學
【學位級別】:博士
【學位授予年份】:2016
【分類號】:O436.3
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