Measuring and testing – Vibration – By mechanical waves
Patent
1979-12-26
1982-01-12
Kreitman, Stephen A.
Measuring and testing
Vibration
By mechanical waves
73643, 324227, G01N 2904
Patent
active
043099050
ABSTRACT:
The method for detecting non-uniformities of magnetic materials resides in the use of the direct and inverse electromagnetic-acoustic conversion, effected in the zone of magnetic non-uniformities of magnetized articles. The method is characterized by effecting said conversion in an intermediate layer located in the vicinity of the material being inspected. As the intermediate layer, materials with great values of dynamic magnetostrictive constants are used. The use of the intermediate layer of a predetermined configuration enables estimation of the non-uniformity value not only singularly by the amplitude of the established elastic vibrations, but also by the number of recurrent pulses whose pulse-height distribution is conditioned by the damping factor of the intermediate layer. In the given device, as distinct from the conventional noise-suppressing devices, operating on the principle of decoding the coded signals, the parameters of the code are defined by the material and structure of the intermediate layer.
REFERENCES:
patent: 4215310 (1980-07-01), Schwerer
W. Lord et al., "Leakage Field Methods of Defect Detection", International Journal of Nondestructive Testing, vol. 4, pp. 249-274, 1972.
V. Klyuyev, "Instrumentation for Nondestructive Testing of Materials and Articles", Machinostroyeniye Publishers, pp. 11-13, 1976.
V. Kulyeev et al., "The Effect of Mechanical Strains on Some Properties of Magnetostriction Materials", 1972.
Bobrov Vladimir T.
Kaplan Mikhail D.
Komsky Igor B.
Maizenberg Mikhail I.
Moshkovich Vladimir U.
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