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.

公开(公告)号：US10197534B2

公开(公告)日：2019-02-05

申请号：US14948398

申请日：2015-11-23

Applicant: Tsinghua University

Inventor： Songling Huang ,  Shen Wang ,  Wei Zhao ,  Shisong Li ,  Zheng Wei

IPC: G01N29/06 ,  G01N29/07 ,  G01N29/24

Abstract: Disclosed are a method and a device for testing a defect based on an ultrasonic Lamb wave tomography. The method includes: partitioning an imaging area of a material to be tested into grids; exciting electromagnetic acoustic transducers for emitting to emit Lamb waves with a A0 mode in all directions, and electromagnetic acoustic transducers for receiving to receive the Lamb waves; obtaining a time-frequency analysis result and recording time-of-flights of testing waves; determining a first slowness of each grid to obtain a first defect area; establishing an extrapolation formula according to the first defect area, and iterating the extrapolation formula to trace and revise paths of the Lamb waves until a better imaging precision is obtained.

公开(公告)号：US20240219311A1

公开(公告)日：2024-07-04

申请号：US18329804

申请日：2023-06-06

Applicant: Tsinghua University

Inventor： Songling Huang ,  Lisha Peng ,  Xinjie Yu ,  Jinghua Zhang ,  Shisong Li ,  Shuzhi Wen

IPC: G01N21/88 ,  G01N21/93 ,  G01N33/38

CPC classification number: G01N21/8851 ,  G01N21/93 ,  G01N33/383 ,  G01N2021/8861 ,  G01N2021/8877 ,  G01N2201/12723

Abstract: The disclosure provides a system for electromagnetic monitoring of active cracks in a concrete dam. The system includes at least four electromagnetic signal acquisition devices and a main control module. Each electromagnetic signal acquisition device includes: an electromagnetic monitoring sensor, an electromagnetic signal acquisition module, a power supply module and a first wireless communication module, for collecting and extracting electromagnetic radiation signals generated by the active cracks in the concrete dam. The main control module includes: a second wireless communication module, a CPU, a data storage unit and a data display unit, for processing the electromagnetic radiation signals received by the second wireless communication module, positioning locations of the active cracks and quantifying sizes of the active cracks.