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    Device and method for testing steel defect based on internal and external magnetic perturbation
    1.
    发明授权
    Device and method for testing steel defect based on internal and external magnetic perturbation 有权

    公开(公告)号：US11378548B2

    公开(公告)日：2022-07-05

    申请号：US17146703

    申请日：2021-01-12

    Applicant: Tsinghua University

    Inventor： Songling Huang ,  Wenzhi Wang ,  Wei Zhao ,  Shen Wang ,  Zijing Huang ,  Xiaochun Song ,  Lisha Peng

    IPC: G01N27/87 ,  G01N27/90

    Abstract: A device and a method for testing a steel defect based on internal and external magnetic perturbation. The device includes: a magnetizer comprising a magnetization source and a magnet yoke, arranged on a surface of a sample, and configured to generate two types of typical magnetic field regions applied to testing based on internal and external magnetic perturbation; a double-row magnetic sensor probe, configured to collect internal and external magnetic perturbation data; a master controller, configured to perform pre-processing on the internal and external magnetic perturbation data, and store the pre-processed data; scanner wheels, configured to generate a sampling trigger pulse during scanning to enable the master controller to receive the internal and external magnetic perturbation data from the probes; and a host computer, configured to analyze the pre-processed data uploaded by the master controller to obtain a defect quantitative result.

    Method for reconstructing defect
    3.
    发明授权
    Method for reconstructing defect 有权

    公开(公告)号：US10935520B2

    公开(公告)日：2021-03-02

    申请号：US15910433

    申请日：2018-03-02

    Applicant: Tsinghua University

    Inventor： Songling Huang ,  Wei Zhao ,  Lisha Peng ,  Shen Wang ,  Di Cheng ,  Jiarui Dong

    IPC: G01N27/83 ,  G06F111/10 ,  G06F30/20 ,  G01N17/00 ,  G06F30/23

    Abstract: A method for reconstructing a defect includes: S1, establishing a database of magnetic flux leakage signals of a unit defect and acquiring a magnetic flux leakage signal of the unit defect; S2, acquiring a target magnetic flux leakage signal; S3, initially setting a scaling factor k; S4, constructing a forward model; S5, inputting the k into the forward model and performing forward prediction according to the k to acquire a predicted magnetic flux leakage signal for the defect to be detected; S6, calculating an error between the target magnetic flux leakage signal and the predicted magnetic flux leakage signal, and determining whether the error is smaller than an error threshold ε, if yes, executing S7; otherwise, executing S5 after the k is corrected; and S7, scaling the unit defect according to the k to acquire a final size of the defect to be detected.

    Method and device for identifying defect opening profile
    4.
    发明授权
    Method and device for identifying defect opening profile 有权

    公开(公告)号：US10788454B2

    公开(公告)日：2020-09-29

    申请号：US16044590

    申请日：2018-07-25

    Applicant: Hubei University of Technology ,  Tsinghua University

    Inventor： Songling Huang ,  Xiaochun Song ,  Lisha Peng ,  Wei Zhao ,  Shen Wang ,  Xinjie Yu ,  Shisong Li

    IPC: G01N27/83

    Abstract: A method for identifying a defect opening profile includes: acquiring a vertical component of a magnetic flux leakage signal of a defect; identifying right-angle features and corresponding right-angle position points of the defect from the vertical component; obtaining all possible right-angle types at each right-angle position point of the defect according to the corresponding right-angle feature of the vertical component; traversing all the possible right-angle types at each right-angle position point to determine respective optimal right-angle type at each right-angle position point; and drawing the defect opening profile according to the respective optimal right-angle type at each right-angle position point.

    High-precision imaging and detecting device for detecting small defect of pipeline by helical magnetic matrix
    5.
    发明授权
    High-precision imaging and detecting device for detecting small defect of pipeline by helical magnetic matrix 有权

    公开(公告)号：US10338160B2

    公开(公告)日：2019-07-02

    申请号：US15840650

    申请日：2017-12-13

    Applicant: Tsinghua University

    Inventor： Songling Huang ,  Wei Zhao ,  Shen Wang ,  Lisha Peng ,  Yu Zhang ,  Xinjie Yu ,  Jun Zou ,  Lin Gui ,  Fuping Wang

    IPC: G01R33/09 ,  F17D5/06 ,  G01M3/40

    Abstract: A high-precision imaging and detecting device for detecting a small defect of a pipeline by a helical magnetic matrix. The device includes: a helical excitation module including a helical excitation coil; a magnetic matrix detection module, disposed at an inner side of the helical excitation coil and including at least one magnetic sensor group arranged at intervals along an axial direction of the helical excitation coil, group including a plurality of magnetic sensors evenly spaced apart and arranged along a circumferential direction of the helical excitation coil, and the magnetic sensor being configured to detect an induction magnetic field of the pipeline; a signal processing module, connected with the magnetic matrix detection module, and configured to receive, process and output an induction magnetic field signal of the pipeline detected by the magnetic sensor.

    Method and device for detecting and evaluating defect
    7.
    发明授权
    Method and device for detecting and evaluating defect 有权

    公开(公告)号：US11099156B2

    公开(公告)日：2021-08-24

    申请号：US16403990

    申请日：2019-05-06

    Applicant: Tsinghua University

    Inventor： Songling Huang ,  Wei Zhao ,  Shen Wang ,  Xinjie Yu ,  Lisha Peng ,  Jun Zou ,  Fuping Wang ,  Jiarui Dong ,  Lin Gui ,  Yue Long

    IPC: G01N27/83 ,  G01N17/00 ,  G01N27/02 ,  G01N27/90

    Abstract: The present disclosure provides a method and a device for detecting and evaluating a defect with electromagnetic multi-field coupling. The method includes magnetizing a pipeline with the electromagnetic multi-field coupling; detecting a defect of the pipeline along an axial direction of the pipeline at a constant speed; collecting signals at a position of the defect to obtain magnetic leakage signals in three dimensions and an electrical impedance signal; pre-processing the collected signals; decoupling the pre-processed signals, to obtain decoupled magnetic leakage signals and a decoupled electrical impedance signal; performing impedance analysis on the decoupled electrical impedance signal, and determining a type of the defect based on a phase angle of the decoupled electrical impedance signal; and performing quantification analysis on the decoupled magnetic leakage signals and performing quantification evaluation on a size of the defect using a neural network defect quantification method.

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