Magnetostrictive resonance excitation

Details Magnetostrictive resonance excitation Magnetostrictive resonance excitation

1990-08-29

1992-09-29

Williams, Hezron E.

Measuring and testing

Vibration

Resonance, frequency, or amplitude study

G01N 2912

Patent

active

051506173

ABSTRACT:
The resonance frequency spectrum of a magnetostrictive sample is remotely determined by exciting the magnetostrictive property with an oscillating magnetic field. The permeability of a magnetostrictive material and concomitant coupling with a detection coil varies with the strain in the material whereby resonance responses of the sample can be readily detected. A suitable sample may be a magnetostrictive material or some other material having at least one side coated with a magnetostrictive material. When the sample is a suitable shape, i.e., a cube, rectangular parallelepiped, solid sphere or spherical shell, the elastic moduli or the material can be analytically determined from the measured resonance frequency spectrum. No mechanical transducers are required and the sample excitation is obtained without contact with the sample, leading to highly reproducible results and a measurement capability over a wide temperature range, e.g. from liquid nitrogen temperature to the Curie temperature of the magnetostrictive material.

REFERENCES:
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patent: 4924706 (1990-05-01), Moore
patent: 4976148 (1990-12-01), Migliori et al.
H. H. Demarest, Jr., "Cube-Resonance Method to Determine the Elasti Constants of Solids," 49 J. Acout. Soc. Amer., No. 3, Part 2, pp. 768 (1971).
E. Schreiber et al., "Resonant-Sphere Methods for Measuring the Velocity of Sound," Elastic Constants and Their Measurement, McGraw-Hill, 1974.
I. Ohno, "Free Vibration of a Rectangular Parallelepiped Crystal and Its Application to Determination of Elastic Constants of Orthorhombic Crystals," 24 J. Phys. Earth, pp. 355 (1976).
K. Kakuno et al., "A New Measuring Method of Magnetostrictive Vibration," 50, J. Appl. Phys., No. 80, pp. 7713 (1979).

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