Properties of Three-Dimensional Magnetostrictions measured with Two-Dimensional Magnetic Measuring Method

Abstract

AC magneto strictions of magnetic materials in arbitrary directions can be measured with the usual three-axial strain gauges. However the accuracy of the measurement is not so good, because the fluctuating magnetic flux influences the output voltages of gauges. We have developed a new gauge construction to reduce the influence of flux changes on the induced voltages. This paper presents the measured AC magnetostrictions in arbitrary directions with the new gauge and the tensor method. In comparison of the new gauge with the usual one, we clarify the noise level and show the usefulness of the new gauge. In addition, we try to evaluate the magnetostrictions in the thickness direction of sheet materials.