Low-frequency eddy current testing using HTS coil driven by PWM inverter

2019 ◽  
Vol 59 (4) ◽  
pp. 1275-1282
Author(s):  
Teruyoshi Sasayama ◽  
Keiji Enpuku
Keyword(s):  
Eddy Current ◽  
Low Frequency ◽  
Eddy Current Testing ◽  
Pwm Inverter ◽  
Current Testing

scholarly journals Evaluation of Sensitivity of Remote Field Eddy Current Testing and Low-Frequency Eddy Current Testing for Inspecting Grooves of Metal Plate

2013 ◽  
Vol 54 (1) ◽  
pp. 90-95 ◽  
Author(s):  
Jing Wang ◽  
Noritaka Yusa ◽  
Hongliang Pan ◽  
Toshiyuki Takagi ◽  
Hidetoshi Hashizume
Keyword(s):  
Eddy Current ◽  
Low Frequency ◽  
Metal Plate ◽  
Eddy Current Testing ◽  
Current Testing

Difference in the detection limits of flaws in the depths of multi-layered and continuous aluminum plates using low-frequency eddy current testing

2008 ◽  
Vol 41 (2) ◽  
pp. 108-111 ◽  
Author(s):  
Hironobu Yamada ◽  
Teruki Hasegawa ◽  
Yudai Ishihara ◽  
Toshihiko Kiwa ◽  
Keiji Tsukada
Keyword(s):  
Eddy Current ◽  
Low Frequency ◽  
Detection Limits ◽  
Eddy Current Testing ◽  
Current Testing ◽  
Aluminum Plates

Rectangular wave eddy current testing using for imaging of backside defects of steel plates

2020 ◽  
Vol 64 (1-4) ◽  
pp. 255-262
Author(s):  
Teruyoshi Sasayama ◽  
Wataru Yoshimura ◽  
Keiji Enpuku
Keyword(s):  
Eddy Current ◽  
Low Frequency ◽  
Harmonic Signal ◽  
Eddy Current Testing ◽  
Steel Plates ◽  
Magnetic Noise ◽  
Rectangular Wave ◽  
Current Testing ◽  
Thick Steel ◽  
Surface Noise

Accurate, easy, and fast inspection of defects on the backside of thick steel plates is essential for the maintenance of infrastructures. Low frequency eddy current testing (LF-ECT) is a promising method to detect defects of the backside of steel plates, with a thickness of approximately 10 mm. However, it is possible that the signal from the backside defect is smaller than that from the surface magnetic noise, causing difficulty identifying the backside defect. In this study, we propose a method to reduce the surface noise by employing a square wave inverter to generate a harmonic signal (rectangular wave ECT, or RECT), and the result demonstrates that the surface noise is successfully reduced using the harmonic signal.

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