Measuring and testing – Vibration – By mechanical waves
Reexamination Certificate
2005-03-22
2005-03-22
Chapman, John E. (Department: 2856)
Measuring and testing
Vibration
By mechanical waves
C073S622000
Reexamination Certificate
active
06868730
ABSTRACT:
Disclosed is an apparatus or a method for measuring flexural waves and/or vibrations acting on ferromagnetic materials or ferromagnetic films. The present invention includes a bias magnet disposed around the ferromagnetic material so as to form a magnetic field in accordance with a stress distribution pattern occurring as the flexural wave propagates along the above said ferromagnetic material, and a measuring device for measuring the time-varying change of the magnetic induction resulting from the propagation of flexural waves on the ferromagnetic material. In addition to the above components, the bias yoke can be disposed around the ferromagnetic material to support the function of the magnet and the formation of the magnetic circuit as a measuring device for the change of the magnetic induction. In addition, a fixed electromagnet can be used as the bias magnet.
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Hegeon Kwun, et al.; Magnetostrictive generation and detection of longitudinal, torsional, and flexural waves in a steel rod; Journal of Acoustical Society of America, vol. 96 (2), pp. 1202-1204, Aug. 1, 1994.
Marcelo J. Dapino, et al.; Structural magnetic strain model for magnetostrictive transducers, IEEE Transaction on Magnetics, vol. 36, No. 3, pp. 545-556, May 2000.
Cho Seung Hyun
Kim Woo Chul
Kim Yoon Young
Kim Young Kyu
Chapman John E.
Keusey, Tutunjian & & Bitetto, P.C.
Seoul National University Industry Foundation
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