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1 Journal of Technical Physics

1 1998

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Comparison of the various types of rotational magnetic flux sensors with search coils using the signal-to-noise ratio

Oka M., Enokizono M.

Journal of Technical Physics

1998

Vol. 39, no 3-4

593-606

A signal from a minor reverse side crack is smaller than a signal from a front side crack on account of distance from the magnetic sensor to the crack. Moreover, this small signal is disturbed by external noise such as front side cracks and others. In order to detect a minor reverse side crack on a magnetic material plate, it is necessary to develop a magnetic sensor provided with high sensivity and high signal-to-noise ratio (S/N). We have experimented with the various types of a rotational magnetic flux sensors with search coils which were developed by us for the detection of minor cracks on a reverse side of a thick steel plate. In this paper, we present results of comparison of the various types of rotational magnetic flux sensors with search coil using S/N. Several types of the magnetic sensors show the high S/N and high sensitivity.