偏振光谱强度调制技术的偏振测量稳定性分析及修正方法研究

Polarimetric spectral intensity modulation (PSIM) is an advanced technology to acquire hiperspectral polarization information. With fully static, snapshot, full Stokes parameter measurement, etc., PSIM has broad application prospects in the field of astronomical observation, remote sensing, and so on. Polarization measurement stability directly affects the accuracy of polarization measurement. But relative to the research on modulation and demodulation, studies on the stability of polarization measurement have rarely been involved which can’t meet the needs of high-precision polarization measurement. Our study will do research on stability evaluation and correction of polarization measurement by theoretical analysis, numerical simulation and experimental verification. Firstly, environmental effects of polarization measurement stability is verified through experiments, and the evaluation index and method of polarization measurement stability are also been presented. Secondly, influence and effect mechanism of environmental conditions on polarization measurement stability are analyzed, and its environmental effect model is also been established. Finally, correction of polarization measurement stability caused by environmental conditions will be given and verified by experiments. This project will lay foundation for improving the polarization measurement accuracy of PSIM, and is significant to the development and application of PSIM.

偏振光谱强度调制技术（PSIM）是目前获取目标高光谱偏振信息的先进技术，具有全静态、快照式、全Stokes参量测量等优点，在天文观测、对地遥感等领域具有广阔的应用前景。偏振测量稳定性直接影响偏振测量精度，但相对于PSIM成熟的调制、解调原理而言，对其偏振测量稳定性的研究则少有涉及，不能满足高精度偏振测量的应用需求。本项目将通过理论分析、数值仿真和实验验证相结合的方法，研究偏振测量稳定性的评价和修正方法。首先，通过实验手段验证偏振测量稳定性的环境效应，给出偏振测量稳定性的评价指标和评价方法；其次，分析环境条件对偏振测量稳定性的作用形式和影响机理，建立偏振测量稳定性的环境因素影响模型；最后，研究环境条件导致的偏振测量稳定性的修正方法，并进行实验验证。本项目的研究将为PSIM偏振测量精度的提高奠定基础，对该技术的深入研究和发展具有重要的理论和现实意义。

本项目旨在提高偏振光谱强度调制技术的测量精度和稳定性，对入射光角度、工作温度和外应力这三个主要因素进行了系统性的研究。首先，从理论上分析了各个影响因素的影响机理，并推导得到了不同因素的影响形式，建立了偏振测量稳定性与环境条件变化之间的函数关系，分析偏振测量稳定性的环境效应敏感度；其次，针对不同环境因素的影响特性，提出了不同的精度与稳定性修正方法，相关的理论和方法均得到了仿真分析验证，结果表明：经过修正补偿后，偏振光谱的测量精度至少提高一个数量级，说明本项目理论成果的准确性和有效性；最后，利用实验室内搭建的测试平台，进一步验证了环境因素的影响和所提出修正技术的可行性，实验结果与仿真结果基本一致，表明运用本项目提出的方法可实现偏振光谱强度调制技术的测量精度和稳定性的定量修正。本项目的研究成果有效完善了偏振光谱强度调制理论，对后续仪器的误差分析与分配和整个仪器系统的研制与标定具有重要的意义，为推广偏振光谱强度调制技术的定量化应用奠定了基础。