scholarly journals BROADBAND ELECTROMAGNETIC TESTING METHODS. PART V. PULSED EDDY CURRENT METHOD.

1969 ◽  
Author(s):  
H.L. Libby
Keyword(s):  
Eddy Current ◽  
Current Method ◽  
Testing Methods ◽  
Eddy Current Method ◽  
Pulsed Eddy Current ◽  
Electromagnetic Testing

THICKNESS MEASUREMENT OF ALUMINUM PLATES WITH A PULSED EDDY CURRENT METHOD

2008 ◽  
Vol 22 (11) ◽  
pp. 911-915 ◽  
Author(s):  
YOUNG JOO KIM ◽  
BONG YOUNG AHN ◽  
SEUNG-SEOK LEE ◽  
YOUNG-KIL SHIN
Keyword(s):  
Eddy Current ◽  
Current Method ◽  
Thickness Measurement ◽  
Eddy Current Method ◽  
Digital Oscilloscope ◽  
Pulsed Eddy Current ◽  
Metal Plates ◽  
Exciting Coil ◽  
Aluminum Plates ◽  
A Current

In this study, coil sensors that are used with a pulsed eddy current (PEC) were designed and fabricated. The proposed sensor is a differential send-receive type that eliminates the voltage induced by the direct field from the exciting coil in a PEC probe. The signal from the sensing coil is generated only on a metal specimen. For the experiment, various metal plates of different conductivities and aluminum plates of different thicknesses from 1 mm to 25 mm were prepared. A voltage square pulse was applied to an exciting coil, and the output from the sensing coil was captured by a digital oscilloscope. The applied voltage was approximately 20 volts at its greatest with a current peak of approximately 15 amperes. A 10% variation of the thickness of an aluminum plate of 20 millimeter thick was measured.

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