Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Reexamination Certificate
2007-05-08
2007-05-08
Lefkowitz, Edward (Department: 2862)
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
C324S240000
Reexamination Certificate
active
10958590
ABSTRACT:
A method and an apparatus for structural diagnosis, which generates torsional waves upon a shaft, beam or pipe having arbitrary cross-sections, such as a circular cross-section, and senses existence or location of the cracks through analyzing reflected waves are disclosed. A magnetostrictive transducer comprises a plurality of ferromagnetic strips attached around a circumference of a member having a arbitrary cross-section with a fixed inclination; a first housing disposed to surround the ferromagnetic strips, the first housing being made of insulating material; and a coil would around the first housing. The magnetostrictive transducer can generate torsional waves upon a member when a current is supplied to the coil, and can measure reflected torsional waves.
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Kwun et al., Magnetostrictive generation and detection of longitudinal, torsional, and flexural waves in a steel rod, Journal of the Acoustical Society of America, vol. 96, Aug. 1994, pp. 1202-1204.
Printout from www.m-w.com of the definition of the term “inclination”, Merriam-Webster Online, printed Sep. 18, 2006, 2 pages.
Park et al., “The Generation of Torsional Waves and the Pipe Diagnosis Using Magnetostrictive Transducers.” Proceedings of the KSNVE Annual Autumn Conference, pp. 544-548, Nov. 13-14, 2003.
Cho Seung Hyun
Han Soon Woo
Kim Yoon Young
Park Chan Il
Lefkowitz Edward
Schindler David M.
Seoul National University Industry Foundation
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