Paper Title:
New Signal Processing Method for Electromagnetic Inspection Using Multidirectional Magnetizing Type Sensor
  Abstract

New signal processing method for Electromagnetic Inspection using multidirectional magnetizing type sensor has been developed to detect linear-shaped defects such as cracks in every direction in test objects. In this method, the Amplitude-Modulated alternating currents, whose waveforms are the product of two sinusoidal waves of different frequencies, are used to produce a rotating magnetic field in test objects. The signal caused by a lift off variation of the sensor, which is not avoidable by conventional multidirectional magnetizing method, is reduced by this method. The effect is investigated by a test using 0.25% carbon steel sheet. It is also investigated that the inclined angles of defects are obtained by the phase information of the signal in a phasor diagram.

  Info
Periodical
Edited by
A.G. Mamalis, M. Enokizono and A. Kladas
Pages
137-141
DOI
10.4028/www.scientific.net/MSF.670.137
Citation
T. Suzuma, "New Signal Processing Method for Electromagnetic Inspection Using Multidirectional Magnetizing Type Sensor", Materials Science Forum, Vol. 670, pp. 137-141, 2011
Online since
December 2010
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Price
$32.00
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