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.

公开(公告)号：US11150311B2

公开(公告)日：2021-10-19

申请号：US16904075

申请日：2020-06-17

Applicant: Tsinghua University

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

IPC: G01R33/00 ,  G01R33/038 ,  H01F7/02

Abstract: A device and a method for detecting a defect contour with omnidirectionally equal sensitivity based on magnetic excitation are provided. The device includes a magnetic sensor array arranged in a spatially uniform magnetic field and configured to collect a magnetic field signal, and a data analysis module configured to analyze the magnetic field signal, extract a distorted magnetic field signal, and obtain an image of the defect contour based on the distorted magnetic field signal.