scholarly journals Magneto-optical Imaging Detection and Strong Classification of Weld Defects in Rotating Magnetic Field

2019 ◽  
Vol 55 (17) ◽  
pp. 61
Author(s):  
GAO Xiangdong ◽  
ZHENG Qiaoqiao ◽  
WANG Chuncao
Keyword(s):  
Magnetic Field ◽  
Optical Imaging ◽  
Rotating Magnetic Field ◽  
Weld Defects ◽  
Imaging Detection

Detection model of invisible weld defects by magneto-optical imaging at rotating magnetic field directions

2020 ◽  
Vol 121 ◽  
pp. 105772 ◽  
Author(s):  
Yanfeng Li ◽  
Xiangdong Gao ◽  
Yanxi Zhang ◽  
Deyong You ◽  
Nanfeng Zhang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Optical Imaging ◽  
Rotating Magnetic Field ◽  
Weld Defects ◽  
Detection Model

Magneto-optical imaging characteristics of weld defects under alternating and rotating magnetic field excitation

2019 ◽  
Vol 112 ◽  
pp. 188-197 ◽  
Author(s):  
Xiangdong Gao ◽  
Liangliang Du ◽  
Nvjie Ma ◽  
Xiaohu Zhou ◽  
Congyi Wang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Optical Imaging ◽  
Rotating Magnetic Field ◽  
Weld Defects ◽  
Imaging Characteristics ◽  
Field Excitation

A novel detection of weld defects by magneto-optical imaging under combined magnetic field

2021 ◽  
Vol 63 (12) ◽  
pp. 704-711
Author(s):  
Nvjie Ma ◽  
Xiangdong Gao ◽  
Congyi Wang ◽  
Yanxi Zhang
Keyword(s):  
Magnetic Field ◽  
Standard Deviation ◽  
Optical Imaging ◽  
Alternating Magnetic Field ◽  
Contour Extraction ◽  
Weld Defects ◽  
Optical Images ◽  
Weld Defect ◽  
Shaped Crack ◽  
Magnetic Field Imaging

To overcome the shortcomings of existing magneto-optical imaging, such as the saturation of an image under a constant magnetic field and the ambiguity of an image under an alternating magnetic field, imaging using a combined magnetic field is presented in this research. Weld defect samples include a laser-cut groove, a wire-cut penetrating groove, a pit and a Z-shaped crack. Magneto-optical imaging experiments were carried out under different magnetic fields. Contour extraction and standard deviation calculations were carried out for all magneto-optical images and the maximum standard deviation of the laser-cut groove under an alternating magnetic field was 20.9, which was less than the maximum value of 37.4 under a combined magnetic field. The experimental results show that the contrast of a magneto-optical image obtained under the combined magnetic field is greater than that obtained under the alternating magnetic field for all defects. The proposed combined magnetic field could optimise the magneto-optical imaging effect for weld defects under the existing excitation method to a certain extent.

Skin depth and detection ability of magneto-optical imaging for weld defects in alternating magnetic field

2020 ◽  
Vol 55 ◽  
pp. 44-55
Author(s):  
Xiangdong Gao ◽  
Xiaohu Zhou ◽  
Congyi Wang ◽  
Nvjie Ma ◽  
Yanxi Zhang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Optical Imaging ◽  
Skin Depth ◽  
Alternating Magnetic Field ◽  
Detection Ability ◽  
Weld Defects

scholarly journals Magneto-Optical Imaging Detection and Reconstruction of Complex-Shaped Weld Defects

2021 ◽  
Vol 1986 (1) ◽  
pp. 012050
Author(s):  
Qianwen Liu ◽  
Yaowu Song ◽  
Guangwen Ye ◽  
Yanxi Zhang ◽  
Congyi Wang ◽  
...  
Keyword(s):  
Optical Imaging ◽  
Weld Defects ◽  
Imaging Detection

THE LINEAR NON-IRON INDUCTOR WITH ROTATING MAGNETIC FIELD

2018 ◽  
Vol 2018 (49) ◽  
pp. 39-50
Author(s):  
О. Karlov ◽  
◽  
I. Kondratenko ◽  
R. Kryshchuk ◽  
A. Rashchepkin ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Rotating Magnetic Field
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