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    Self-calibration procedure for optical polarimeters
    26.
    发明公开
    Self-calibration procedure for optical polarimeters 审中-公开
    偏光仪

    公开(公告)号：EP2405245A2

    公开(公告)日：2012-01-11

    申请号：EP11173305.1

    申请日：2011-07-08

    Applicant: OFS Fitel, LLC

    Inventor： Mikhailo, Vitaly ,  Westbrook, Paul S.

    IPC: G01J4/00 ,  G01J4/04

    CPC classification number: G01J4/00 ,  G01J4/04

    Abstract: A procedure for self-calibration of an optical polarimeter has been developed that eliminates the need for "known" input signals to be used. The self-calibration data is then taken by moving a polarization controller between several random and unknown states of polarization (SOPs) and recording the detector output values (D 0 , ..., D 3 ) for each state of polarization. These values are then used to create an "approximate" calibration matrix. In one exemplary embodiment, the SOP of the incoming signal is adjusted three times (by adjusting a separate polarization controller element, for example), creating a set of four detector output values for each of the four polarizations states of the incoming signal - an initial calibration matrix. The first row of this initial calibration matrix is then adjusted to fit the power measurements using a least squares fit. In the third and final step, the remaining elements of the calibration matrix are adjusted to a given constraint (for example, DOP=100% for all SOPs).

    Abstract translation: 已经开发了用于光学偏振计的自校准的步骤，其消除了对使用的“已知”输入信号的需要。 通过在多个随机和未知极化状态（SOP）之间移动偏振控制器并记录每个极化状态的检测器输出值（D 0，...，D 3）来进行自校准数据。 然后使用这些值创建一个“近似”校准矩阵。 在一个示例性实施例中，输入信号的SOP被调整三次（例如通过调整单独的偏振控制器元件），为输入信号的四个极化状态中的每一个产生一组四个检测器输出值 - 初始 校准矩阵。 然后调整该初始校准矩阵的第一行以使用最小二乘法拟合功率测量。 在第三和最后一步中，校准矩阵的其余元素被调整到给定的约束（例如，对于所有SOP，DOP = 100％）。

    APPARATUS AND METHODS FOR CONCENTRATION DETERMINATION USING POLORIZED LIGHT
    28.
    发明公开
    APPARATUS AND METHODS FOR CONCENTRATION DETERMINATION USING POLORIZED LIGHT 审中-公开
    装置和方法用于确定浓度偏振光的BASIS

    公开(公告)号：EP2205949A1

    公开(公告)日：2010-07-14

    申请号：EP08845082.0

    申请日：2008-11-03

    Applicant: Deka Products Limited Partnership

    Inventor： HELMORE, Simon, C. ,  SACHS, Jason ,  SCARPACI, Jacob, W.

    IPC: G01J4/00

    CPC classification number: G01N21/21 ,  A61M1/14 ,  G01J4/04 ,  G01N21/90 ,  G01N2201/0612 ,  G01N2201/0683

    Abstract: Methods and apparatus for concentration determination using polarized light. The apparatus includes a first polarized light source having a first light source polarization axis and a second polarized light source having a second light source polarization axis generally perpendicular to the first light source polarization axis. Also, a first polarized light receiver having a first polarized light receiver polarization axis and configured to measure an intensity of light transmitted from the first light receiver polarizer and a second polarized light receiver having a second polarized light receiver polarization axis substantially perpendicular to the first light receiver polarization axis and configured to measure an intensity of light transmitted from the second light receiver polarizer, wherein the first and second light receiver polarization axes are generally +/−45 degrees relative to the first and second light source polarization axes.

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