Li Qiwei, Song Jiawei, Alenin Andrey S, Scott Tyo J
Appl Opt. 2021 Jan 20;60(3):735-744. doi: 10.1364/AO.412963.
Spatiotemporally modulated polarimeters have shown promising imaging performance by leveraging the tradeoff between spatial bandwidth and temporal bandwidth to outperform polarimeters that use spatial or temporal modulation alone. However, the existing separable modulation strategy, in which the spatial carriers are generated independently from the temporal carriers, makes such devices sensitive to the systematic errors of the rotation element inevitably. In this paper, we propose two novel strategies that have spatiotemporal modulation that is inherently mixed. The method enables different elements of the Mueller matrix to be used to create the carriers, reducing the effects of systematic errors in different ways. We present the indepth comparison of the channel structure and the reconstruction accuracy of each modulation strategy in various bandwidth scenarios under the presence of systematic error. Simulation results show that the nonseparable modulation can provide higher reconstruction accuracy of polarimetric information as compared to the separable strategy.
时空调制偏振计通过利用空间带宽和时间带宽之间的权衡，展现出了颇具前景的成像性能，从而超越了仅使用空间或时间调制的偏振计。然而，现有的可分离调制策略，即空间载波与时间载波独立生成，不可避免地使此类设备对旋转元件的系统误差敏感。在本文中，我们提出了两种具有固有混合时空调制的新颖策略。该方法能够利用穆勒矩阵的不同元素来创建载波，以不同方式降低系统误差的影响。我们深入比较了在存在系统误差的各种带宽场景下，每种调制策略的通道结构和重建精度。仿真结果表明，与可分离策略相比，不可分离调制能够提供更高的偏振信息重建精度。
