公开(公告)号：US06816261B2

公开(公告)日：2004-11-09

申请号：US10146228

申请日：2002-05-14

申请人： Jayantilal S. Patel ,  Zhizhong Zhuang ,  John A. Yeazell

发明人： Jayantilal S. Patel ,  Zhizhong Zhuang ,  John A. Yeazell

IPC分类号： G01J400

CPC分类号： G01J4/04 ,  G01J3/447 ,  G01J4/00 ,  G01M11/331

摘要： Measurements at multiple distinct polarization measurement states are taken to define the polarization state of an input, for example to calculate a Stokes vector. High accuracy and/or capability of frequent recalibration are needed, due to the sensitivity of measurement to retardation of the input signal. A multiple measurement technique takes a set of spatially and/or temporally distinct intensity measurements through distinct waveplates and polarizers. These can be optimized as to orientation and retardation using initial choices and also using tunable elements, especially controllable birefringence elements. A device matrix defines the response of the device at each of the measurement states. The matrix can be corrected using an iterative technique to revise the device matrix, potentially by automated recalibration. Two input signals (or preferably the same signal before and after a polarization transform) that are known to have a common polarization attribute or other attribute relationship are measured and the common attribute and/or attribute relationship is derived for each and compared. The device matrix is revised, for example by iterative correction or by random search of candidates to improve the accuracy of the device matrix. Optional tunable spectral and temporal discrimination provide additional functions.

摘要翻译： 采用多个不同极化测量状态的测量来定义输入的偏振状态，例如计算斯托克斯矢量。 由于测量对输入信号的延迟的敏感性，需要高精度和/或频繁重新校准的能力。 多重测量技术通过不同的波片和偏振器采取一组空间和/或时间上不同的强度测量。 可以使用初始选择以及使用可调谐元件，特别是可控双折射元件来定向和延迟这些。 器件矩阵定义了器件在每个测量状态下的响应。 可以使用迭代技术校正矩阵，以便通过自动重新校准来修改器件矩阵。 测量已知具有共同极化属性或其他属性关系的两个输入信号（或优选地，在偏振变换之前和之后的相同信号），并且为每个并且进行比较导出公共属性和/或属性关系。 修改设备矩阵，例如通过迭代校正或通过随机搜索候选来改进设备矩阵的准确性。 可选的可调谐光谱和时间辨别提供附加功能。