期刊论文

Lou, Weimin

Shen, CY (reprint author), China Jiliang Univ, Inst Optoelect Technol, Hangzhou 310018, Zhejiang, Peoples R China.

Peng, Wei,Shen, Changyu,Zhu, Zhouhong,Liu, Zexu,Shentu, Fengying,Xu, Weixin,Lang, Tingting,Zhang, Yang,Jing, Zhenguo

2018-08-15

IEEE SENSORS JOURNAL

SCIE

J

18

16

6540-6546

1530-437X

Low frequency; saturation magnetization; internal defect detection

A ferromagnetic material equipment internal defect detection system based on low-frequency (20-50 Hz) electromagnetic technique was proposed. Direct current magnetization was used to make the ferromagnetic material sample (20# steel for instance) be in a saturation magnetization state to decrease its permeability, which is beneficial for increasing the skin depth of the sample and strengthening the signal of the magnetic flux leakage. A low-frequency alternating current source was used to excite the spatial alternating electromagnetic field and a Hall sensor was used to collect the signal of the spatial magnetic field. Experimental results showed that the 6-mm buried depth internal defect with the sensitivity of 0.05 mm can be detected in the 12-mm thick 20# steel plate or pipeline, which is almost 1.5 times higher than that of the current similar sensors.