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340 条记录 (耗时 0.025 秒)

    Method of evaluating fiber PMD using composite POTDR trace
    1.
    发明授权
    Method of evaluating fiber PMD using composite POTDR trace 失效
    使用复合POTDR迹线评估纤维PMD的方法

    公开(公告)号：US07164469B1

    公开(公告)日：2007-01-16

    申请号：US11174137

    申请日：2005-06-30

    申请人： Xin Chen ,  Timothy L. Hunt

    发明人： Xin Chen ,  Timothy L. Hunt

    IPC分类号： G01N21/00

    CPC分类号： G01M11/3181 ,  H04B10/071

    摘要： A method for screening fiber polarization mode dispersion using a polarization optical time domain reflectometer. A pulse radiation is emitted into the fiber under test, and the backscattered radiation is measured by the POTDR and used to obtain a POTDR trace. A composite trace of more than one POTDR trace is obtained. The composite trace is then analyzed to compare the variation of signals along the length of the fiber, the variation in signals relating to the level of PMD along the length of the fiber. Because high levels of PMD correspond to localized levels of low variability, by setting the variability of signal threshold sufficiently low, fibers having unacceptably high localized PMD can be identified and removed.

    摘要翻译： 一种使用偏振光学时域反射计屏蔽光纤偏振模色散的方法。 脉冲辐射被发射到被测光纤中，反向散射辐射由POTDR测量并用于获得POTDR迹线。 获得多于一个POTDR迹线的复合迹线。 然后分析复合迹线以比较沿着光纤长度的信号的变化，与沿着光纤长度的PMD的水平相关的信号的变化。 由于高水平的PMD对应于低变异性的局部水平，通过将信号阈值的可变性设置得足够低，可以识别和去除具有不可接受的高局部PMD的纤维。

    Method of evaluating fiber PMD using polarization optical time domain reflectometry
    2.
    发明授权
    Method of evaluating fiber PMD using polarization optical time domain reflectometry 有权
    使用偏振光学时域反射法评估光纤PMD的方法

    公开(公告)号：US06946646B2

    公开(公告)日：2005-09-20

    申请号：US10287995

    申请日：2002-11-05

    申请人： Xin Chen ,  Nicol A. Heron ,  Timothy L. Hunt ,  Eric J. Mozdy ,  Darren A. Stainer

    发明人： Xin Chen ,  Nicol A. Heron ,  Timothy L. Hunt ,  Eric J. Mozdy ,  Darren A. Stainer

    IPC分类号： G01J3/447 ,  G01J4/00 ,  G01M11/00 ,  G02F1/01 ,  H04B10/00

    CPC分类号： G01M11/3181

    摘要： A method for screening fiber polarization mode dispersion using a polarization optical time domain reflectometer. A pulse radiation is emitted into the fiber under test, and the backscattered radiation is measured by the POTDR and used to obtain a POTDR trace. The POTDR trace is then analyzed to compare the variation of signals along the length of the fiber, the variation in signals relating to the level of PMD along the length of the fiber. Because high levels of PMD correspond to localized levels of low variability, by setting the variability of signal threshold sufficiently low, fibers having unacceptably high localized PMD can be identified and removed.

    摘要翻译： 一种使用偏振光学时域反射计屏蔽光纤偏振模色散的方法。 脉冲辐射被发射到被测光纤中，反向散射辐射由POTDR测量并用于获得POTDR迹线。 然后分析POTDR迹线以比较沿着光纤长度的信号的变化，与沿着光纤长度的PMD的水平相关的信号的变化。 由于高水平的PMD对应于低变异性的局部水平，通过将信号阈值的可变性设置得足够低，可以识别和去除具有不可接受的高局部PMD的纤维。

    Guided Wave Non-Destructive Testing Using Magnetostrictive Sensor with Moving Magnet and Partial Activation of Magnetostrictive Strip
    3.
    发明公开
    Guided Wave Non-Destructive Testing Using Magnetostrictive Sensor with Moving Magnet and Partial Activation of Magnetostrictive Strip 审中-公开

    公开(公告)号：US20240027403A1

    公开(公告)日：2024-01-25

    申请号：US18357142

    申请日：2023-07-23

    申请人： Sergey Vinogradov ,  Xin Chen ,  Jay Fisher

    发明人： Sergey Vinogradov ,  Xin Chen ,  Jay Fisher

    IPC分类号： G01N29/24 ,  G01N29/265

    CPC分类号： G01N29/2412 ,  G01N29/265 ,  G01N2291/044 ,  G01N2291/0422

    摘要： A “partial activation” method of magnetostrictive guided wave testing of a structure. A coil-wrapped magnetostrictive strip is acoustically coupled to the surface of the structure. A permanent magnet is placed over a portion of the strip, such that the permanent magnet covers all or most of the width of the strip but only a portion of its length. A pulsed alternating current source activates the magnetostrictive strip, thereby producing magnetostrictive vibrations in the magnetostrictive strip, and thereby resulting in guided waves in the structure. Response signals are received, then the permanent magnet is moved to a next position along the length of the magnetostrictive strip. As the magnet is moved along the strip, the strip is activated and response signals are received, thereby testing a desired portion of the structure under the strip. The response signals are analyzed to determine the presence of anomalies in the structure.

    Synchronization method and system for single event list type data in PET imaging
    5.
    发明授权
    Synchronization method and system for single event list type data in PET imaging 有权

    公开(公告)号：US10930031B2

    公开(公告)日：2021-02-23

    申请号：US14408935

    申请日：2012-08-14

    申请人： Qingguo Xie ,  Yuanbao Chen ,  Jun Zhu ,  Xin Chen ,  Zhongyi Wu ,  Luyao Wang

    发明人： Qingguo Xie ,  Yuanbao Chen ,  Jun Zhu ,  Xin Chen ,  Zhongyi Wu ,  Luyao Wang

    IPC分类号： G06T11/00 ,  G01T1/29 ,  A61B6/03

    摘要： A method for synchronizing list-mode data of single events in a PET imaging includes: acquiring list-mode data of single events of each independent detector module, calculating a probability density of time intervals between occurrences of single events in detector module and setting initial parameters, determining detection starting time difference of each detector module with iterative peak searching and graded time window, and performing synchronization correction and coincidence discrimination on the single event data in each detector module based on the detection starting time difference. A system for synchronizing list-mode data of single events in a PET imaging includes: a data acquisition and frequency difference compensation module, an initial parameter setting module, a coarse time scale coincidence module, a fine time scale coincidence module and a data synchronization correction and coincidence discrimination module.

    Measuring tissue shear wave properties using one excitation pulse and excitation pulses having different widths and shapes
    7.
    发明授权
    Measuring tissue shear wave properties using one excitation pulse and excitation pulses having different widths and shapes 有权

    公开(公告)号：US10327739B2

    公开(公告)日：2019-06-25

    申请号：US15090357

    申请日：2016-04-04

    申请人： Yi Zheng ,  Siping Chen ,  Tianfu Wang ,  Xin Chen ,  Haoming Lin

    发明人： Yi Zheng ,  Siping Chen ,  Tianfu Wang ,  Xin Chen ,  Haoming Lin

    IPC分类号： A61B8/08 ,  G01S7/52 ,  G01S7/62

    摘要： Ultrasound radiation using a single tone burst pulse is applied to a selected location in a tissue region. The induced shear wave is detected in the region and its spectral distribution is calculated and analyzed. This detection may be repeated with other excitation pulses having different widths or different shapes at the same location. The spectral analysis of the detected shear wave is performed according to a nonlinear shear model for solving nonlinearity and viscoelasticity of the tissue at a single location. The detection location can be at one point at a time for imaging two-dimensional or three-dimensional tissue nonlinearities and shear wave properties including nonlinear magnitude variations, nonlinear phase variations, nonlinear coefficients, and viscoelasticity. The induced shear wave are detected at multiple locations along the shear propagation directions for calculating different shear group velocities and different shear phase velocities using different excitation pulses, and calculating nonlinearity and viscoelasticity.

    AUTOMATED FRUIT AND VEGETABLE CALYX OR STEM REMOVAL MACHINE
    10.
    发明申请
    AUTOMATED FRUIT AND VEGETABLE CALYX OR STEM REMOVAL MACHINE 审中-公开
    自动水果和蔬菜CALYX或STEM移除机

    公开(公告)号：US20160255873A1

    公开(公告)日：2016-09-08

    申请号：US15152400

    申请日：2016-05-11

    申请人： Yang Tao ,  John Lin ,  Xin Chen ,  Gary E. Seibel

    发明人： Yang Tao ,  John Lin ,  Xin Chen ,  Gary E. Seibel

    IPC分类号： A23N15/02 ,  B26D7/06 ,  B26F3/00 ,  B26D5/00

    CPC分类号： A23N15/02 ,  A23L19/03 ,  B26D5/00 ,  B26D5/007 ,  B26D5/34 ,  B26D7/0625 ,  B26F3/004

    摘要： A system and methods are provided for removal of undesired portions of a fruit or vegetable, such as removal of calyxes from strawberries before they are flash frozen. An automated process for high-throughput fruit or vegetable calyx removal includes a loading system, an identification system, and a removal system. The loading system is configured to transport the fruit or vegetable through the automated process. The loading system may also orient the fruits or vegetables along an axis of the fruit and or align the fruit or vegetables in a desired pattern, orientation, and/or arrangement. The identification system is configured to locate the calyx and determines calyx position data and an optimal cutting path for individual fruit. The removal system uses data received from the identification system to separate the calyx from the fruit or vegetable.

    摘要翻译： 提供了用于去除水果或蔬菜的不期望的部分的系统和方法，例如在快速冷冻之前从草莓中除去花萼。 用于高通量水果或蔬菜花萼去除的自动化过程包括加载系统，识别系统和去除系统。 装载系统配置为通过自动化过程运输水果或蔬菜。 装载系统还可以沿水果的轴线定向水果或蔬菜，或者以所需的图案，取向和/或布置方式对准水果或蔬菜。 识别系统被配置为定位花萼并且确定花萼位置数据和用于单个果实的最佳切割路径。 去除系统使用从识别系统接收的数据将花萼与水果或蔬菜分开。