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    SYSTEM ZUR BERÜHRUNGSLOSEN HAND- UND FINGERLINIEN-ERKENNUNG
    92.
    发明公开
    SYSTEM ZUR BERÜHRUNGSLOSEN HAND- UND FINGERLINIEN-ERKENNUNG 有权
    系统非接触式手指纹线检测

    公开(公告)号：EP1073988A1

    公开(公告)日：2001-02-07

    申请号：EP99927701.5

    申请日：1999-04-21

    Applicant: TST-Touchless Sensor Technology AG

    Inventor： HAUKE, Rudolf ,  EINIGHAMMER, Hans, J. ,  EINIGHAMMER, Jens

    IPC: G06K9/20 ,  A61B5/117

    CPC classification number: G06K9/00033 ,  G01J4/00 ,  G06K9/2036 ,  G07C9/00158

    Abstract: The invention relates to a method for imaging hand and/or finger lines with a camera which functions without contacting the skin with the recording device. By using linear or circular polarized light in the illuminating and imaging beam path, a separate representation of the upper and lower skin pattern is made possible. In doing this, an image of the skin relief which is rich in contrast is obtained. In addition, the information regarding the deeper lying skin layers through which blood flows can be obtained. An algorithm searches the skin pattern of the hand surface for line elements of different thicknesses and direction (vectors). The calculated numeric identification contains total frequencies of occurrence of vectors, amplitudes and phases of harmonic components of projections of vector images of both patterns. The method makes it possible to identify people from a distance, to completely protect the measuring device and to provide an improved security against deception.

    A METHOD AND APPARATUS FOR VIEWING
    95.
    发明公开
    A METHOD AND APPARATUS FOR VIEWING 失效
    方法和仪器监测

    公开(公告)号：EP0791170A4

    公开(公告)日：1999-08-04

    申请号：EP95939147

    申请日：1995-11-09

    Applicant: WOLFF LAWRENCE B

    Inventor： WOLFF LAWRENCE B

    IPC: G01J4/00

    CPC classification number: G01J4/00

    Abstract: An apparatus (10) comprises an optical filter (12), which resolves electromagnetic radiation into a sequence of resolved polarization components, an imaging device (14), having a storage device (16), and a driver (18). The imaging device (14) receives the sequence of resolved polarization components from the optical filter (12) and stores them in the storage device (16). The driver (18), which receives the video synchronization signal, produces a filter synchronization signal which is provided to the optical filter (12) to cause the optical filter (12) to produce the sequence of resolved polarization components so the optical filter (12) is in synchronization with the imaging device (14). This apparatus (10) is used to view the polarization properties of a scene.

    COMPOSANT OPTIQUE DE MODULATION DE POLARISATION, ET SON UTILISATION DANS UN POLARIMETRE OU DANS UN ELLIPSOMETRE
    96.
    发明公开
    COMPOSANT OPTIQUE DE MODULATION DE POLARISATION, ET SON UTILISATION DANS UN POLARIMETRE OU DANS UN ELLIPSOMETRE 失效
    光学部件极化调制，及其VEWENDUNG在偏光仪或椭圆

    公开(公告)号：EP0870180A1

    公开(公告)日：1998-10-14

    申请号：EP97910494.0

    申请日：1997-10-16

    Applicant: CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE (CNRS)

    Inventor： DREVILLON, Bernard ,  COMPAIN, Eric

    IPC: G01J4 ,  G01N21 ,  G02F1

    CPC classification number: G01N21/211 ,  G01J4/00 ,  G02F1/0327

    Abstract: The invention concerns an optical component of polarizing modulation, a polarimeter and a Mueller ellipsometer comprising this optical component. The optical component modulates an incident light beam (10) linearly polarized and sends back a modulated beam (11). It comprises a coupled phase modulator (6B) modulating twice successively the incident beam, the two modulations being at the same frequency φ/2π and being coupled by a system (61) modifying the state of polarization of the light between the two modulations. The ellipsometer comprises means for sensing a measuring beam sent back by a sample, which receives the modulated beam, and a processing unit. The sensing means include a polarimeter generating n measured quantities representing the states of polarization of the beam and the processing unit generates by Fourier transform m values for each of these quantities, with n x m ≥ 16 and m ≥ 4, for simultaneously acceding to the sixteen coefficients of the Mueller matrix of the sample.

    Polarisation monitoring methods and apparatus
    97.
    发明公开
    Polarisation monitoring methods and apparatus 失效
    Verfahren zur Probenuntersuchung mittelsÄnderungder Polarization

    公开(公告)号：EP0737856A2

    公开(公告)日：1996-10-16

    申请号：EP96301670.4

    申请日：1996-03-12

    Applicant: J.A. WOOLLAM CO. INC.

    Inventor： Green, Steven E. ,  Woollam, John A. ,  Herzinger, Craig M. ,  Ducharme, Stephen P. ,  Johs, Blaine D.

    IPC: G01N21/21 ,  G01J3/447

    CPC classification number: G01J4/00 ,  G01J3/447 ,  G01N21/211

    Abstract: A system and method for controlling polarisation state determining parameters of a polarised beam of light in an ellipsometer or polarimeter and the like system, so that they are in ranges wherein the sensitivity, of a sample system characterising PSI and DELTA value monitoring detector (DET) used to measure changes in said polarisation state resulting from interaction with a "composite sample system," comprised of a sample system per se. (SS) and a beam polarisation state determining variable retarder, to noise and measurement errors etc. therein), is reduced. This allows determining sample system per se.
    characterising PSI and DELTA values, from Composite Sample System characterising PSI and DELTA values, by compensating for the presence of components, (VR1) and/or (VR2), added to an ellipsometer or polarimeter and the like system. The arrangement also improves the ability of an ellipsometer or polarimeter and the like system fitted with components (VR1) and/or (VR2) to provide usably accurate and precise sample system characterising PSI and DELTA determining data values, wherein a sample system per se. investigating polarised beam of light is oriented at other than a Principal or Brewster Angle of Incidence thereto, the use of which Angle of Incidence would otherwise be difficult, if not impossible. The arrangement also allows determination of the "Handedness" of a polarised beam of light, and of sample system Jones or Mueller Matrix component values; and provides means for making system components (VR1) and/or (VR2) added to an ellipsometer or polarimeter and the like system, essentially end user transparent when desired, without removal thereof from said ellipsometer or polarimeter and the like system.

    Abstract translation: 用于控制椭偏仪或偏振计等偏振光束的偏振态确定参数的系统和方法，使得它们处于表征PSI和DELTA值监视检测器（DET）的样本系统的灵敏度的范围内， 用于测量由与样品系统本身组成的“复合样品系统”的相互作用产生的所述极化状态的变化。 （SS）和光束偏振状态确定可变延迟器，其中的噪声和测量误差等）降低。 这允许确定样品系统本身。 通过补偿添加到椭偏仪或偏振计等的组件（VR1）和/或（VR2）的存在来表征PSI和DELTA值的复合样品系统的PSI和DELTA值的表征。 该装置还提高了配有组件（VR1）和/或（VR2）的椭偏仪或偏振计等的系统能够提供表征PSI和DELTA确定数据值的可用的精确和精确的采样系统的能力，其中采样系统本身。 调查偏振光束的方向是除了Principal或Brewster入射角之外，否则使用哪个角度的发生角度将是困难的，甚至是不可能的。 该布置还允许确定偏振光束和样本系统Jones或Mueller Matrix分量值的“Handedness”; 并且提供用于将系统组件（VR1）和/或（VR2）添加到椭偏仪或偏振计等的系统，基本上终端用户在需要时是透明的，而不从所述椭偏仪或偏振计等偏移仪中去除。

    POLARIZATION VIEWER
    98.
    发明公开
    POLARIZATION VIEWER 失效
    极化研究单位

    公开(公告)号：EP0729687A4

    公开(公告)日：1995-11-20

    申请号：EP94901207

    申请日：1993-10-26

    Applicant: WOLFF LAWRENCE B

    Inventor： WOLFF LAWRENCE B

    IPC: G02B23/24 ,  G01J4/00 ,  G02F1/13 ,  H04N5/225 ,  G01N21/21

    CPC classification number: H04N5/2254 ,  G01J4/00

    Abstract: A polarization viewer comprising a mechanism (12, 18, 20) for forming a broadview image having a spectral width greater than 2 angstroms and 50 DEG based on polarization information of a scene. The polarization viewer is also comprised of a mechanism (12, 18, 20) for providing polarization information to the forming mechanism. The providing mechanism is in communication with the forming mechanism. In a first embodiment, the providing mechanism includes a camera mechanism in communication with the forming mechanism. The camera mechanism includes a fixed polarizer analyzer (12) disposed such that electromagnetic radiation entering the camera mechanism passes through the polarizer analyzer (12). The providing mechanism can also include a mechanism for steering a polarization plane of the radiation. The steering mechanism is disposed such that radiation passing through the polarizer analyser first passes through the steering mechanism. The steering mechanism preferably includes a first twist crystal (18) and at least a second twist crystal (20) aligned with the first twist crystal such that radiation passing through the first crystal has a first state and a second state.

    Method and apparatus for measuring polarization mode dispersion in optical devices
    99.
    发明公开
    Method and apparatus for measuring polarization mode dispersion in optical devices 失效
    用于测量光学器件中极化模式分散的方法和装置

    公开(公告)号：EP0553460A3

    公开(公告)日：1993-10-27

    申请号：EP92121214.8

    申请日：1992-12-12

    Applicant: HEWLETT-PACKARD COMPANY

    Inventor： Heffner, Brian L.

    IPC: G01M11/00 ,  G01J4/00

    CPC classification number: G01M11/334 ,  G01J4/00 ,  G01M11/336 ,  H04B10/2569

    Abstract: An instrument includes a polarized optical source for producing three sequential predetermined states of polarization of a light beam at each of at least two wavelengths, as well as an optical polarization meter for measuring the polarization of a portion of the light beam at each wavelength transmitted by or reflected from an optical network by splitting it into four beams, passing three of the beams through optical elements, measuring the transmitted intensity of all four beams, and calculating Stokes parameters. The three sequential predetermined states of polarization at each wavelength yield three corresponding Jones input vectors at each wavelength, and the Stokes parameters for the responses of the optical network are converted to three Jones output vectors at each wavelength. A Jones matrix for the optical network to within a complex constant is then computed from the Jones input and output vectors at each wavelength. Polarization mode dispersion in the optical network is determined from these matrices.

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