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    • 23. 发明申请
    • LIQUID CRYSTAL BASED BROADBAND FILTER FOR FAST POLARIZATION IMAGING
    • 基于液晶的宽带滤波器,用于快速极化成像
    • US20100315567A1
    • 2010-12-16
    • US12484849
    • 2009-06-15
    • Bing WenDonald TaberDong-Feng Gu
    • Bing WenDonald TaberDong-Feng Gu
    • G02F1/1335G01J4/00
    • G01J4/04G02B5/3016G02F1/13363G02F2001/133638G02F2203/07G02F2203/62G02F2413/04G02F2413/08
    • A liquid crystal based broadband filter and imaging system for analyzing the polarization state of radiation. The filter includes four elements: a quarter wave plate; a 45° polarization rotator; a 90° polarization rotator; and a fixed polarizer. The first three of these elements are electronically switchable, allowing the user to select from any of the six possible polarization states. The switchable elements use multiple liquid crystal cells made from dual-frequency materials. A dual-frequency signal is used to activate and deactivate the various elements to achieve the desired state configuration. The dual-frequency signal drives the liquid crystal cells in and out of states, improving the overall switching time of the filter. The configuration of the liquid crystal cells within each of the filter allows broadband operation over most of the visible, infrared and ultraviolet spectra. The filter cycles through six configurations corresponding to the six polarization states of the incident radiation. Thus, the polarization state of the radiation can be completely characterized using the four Stokes parameters. Information related to the intensity and polarization of the radiation can be stored, displayed and analyzed.
    • 一种用于分析辐射极化状态的基于液晶的宽带滤波器和成像系统。 滤波器包括四个元件:四分之一波片; 45°偏振旋转器; 90°偏振旋转器; 和固定偏振器。 这些元件的前三个是电子可切换的,允许用户从六个可能的偏振状态中的任一个中进行选择。 可切换元件使用由双频材料制成的多个液晶单元。 使用双频信号来激活和去激活各种元件以实现期望的状态配置。 双频信号驱动液晶单元进入和退出状态,从而提高滤波器的整体切换时间。 每个滤波器内的液晶单元的配置允许宽带操作大多数可见光,红外和紫外光谱。 滤波器循环通过对应于入射辐射的六个偏振状态的六个配置。 因此,可以使用四个斯托克斯参数来完全表征辐射的偏振状态。 可以存储,显示和分析与辐射的强度和极化有关的信息。