Abstract
A new method for measuring magnetostrictive vibrational displacements has been developed by utilizing a laser interferometric technique with sensitivity enough to detect a vibrational displacement of 10 Å. The most striking merit of this method is that a non-contact and reaction free measuring is essentially permitted. The reliability of this interferometric method is checked by measuring vibrational displacements of a cylindrical nickel rod specimen by means of both the present method and the conventional strain gauge method simultaneously. It is found that the agreement between the two experimental results obtained on the basis of these methods is very good. Therefore, it is concluded that the present interferometric method is quite reliable. The magnitude and the sign of the magnetostrictive vibrational displacements of the cylindrical rod specimens of a single crystal nickel and a polycrystal Ni60-Fe40 alloy are measured by means of the present interferometric method. Satisfactory results are obtained.
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