Song Jiawei, Vaughn Israel J, Alenin Andrey S, Tyo J Scott
Opt Express. 2019 Sep 30;27(20):28423-28436. doi: 10.1364/OE.27.028423.
Most channeled polarimeters modulate the intensity in a single independent domain such as space, time, or wavenumber. Recently we proposed and modeled a concept for a system modulated simultaneously in space and time [Opt. Lett.43, 2768 - 2771 (2018)] and demonstrated that superior performance could be obtained by trading off spatial and temporal bandwidth in the system. Here we present results from a prototype realization of such a system and demonstrate quantitatively that the spatial modulation transfer function of the imager can be improved by choosing the appropriate modulation strategy for a given scene spatial and temporal bandwidth. We demonstrate that a hybrid modulation system can achieve the high spatial frequency performance of a time modulated system for static scenes, or it can achieve the high temporal frequency performance of a spatially modulated system for rapidly varying scenes, and it can out perform both systems for scenes with intermediate bandwidth in both domains. Moreover, the physical system implementation is essentially the same for each system type, which in principle allows the reconstruction strategy to be selected in real-time by choosing the appropriate reconstruction filters.
大多数通道式旋光仪在单个独立域（如空间、时间或波数）中调制强度。最近，我们提出并对一个在空间和时间上同时调制的系统概念进行了建模[《光学快报》43, 2768 - 2771 (2018)]，并证明通过在系统中权衡空间和时间带宽可以获得卓越的性能。在此，我们展示了这种系统的原型实现结果，并定量证明通过为给定场景的空间和时间带宽选择合适的调制策略，可以提高成像仪的空间调制传递函数。我们证明，混合调制系统对于静态场景可以实现时间调制系统的高空间频率性能，对于快速变化的场景可以实现空间调制系统的高时间频率性能，并且对于两个域中具有中间带宽的场景，它的性能优于这两种系统。此外，每种系统类型的物理系统实现基本相同，原则上这允许通过选择合适的重建滤波器来实时选择重建策略。
