New Signal Processing Method for Electromagnetic Inspection Using Multidirectional Magnetizing Type Sensor

Abstract:

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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.

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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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$35.00

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