Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Reexamination Certificate
2005-02-01
2005-02-01
Ledynh, Bot (Department: 2862)
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
C324S228000
Reexamination Certificate
active
06850056
ABSTRACT:
A flaw detection device for a steel bar enabling inspection of a high temperature steel bar at a high temperature.A pre-treatment unit31, detection unit32, and post-treatment unit33are arranged along a running direction of a steel bar10. The pre-treatment unit and post-treatment unit have the same structure. Direct current coils312and332are wound around the outside of the sleeves311and331. The steel bar is magnetically saturated by the direct current magnetic field. An eddy current is generated at the surface of the steel bar by an alternating current coil321of a detection unit12. The change in the magnetic field caused by the eddy current is detected by the detection windings322and323. The sleeves are made of nonmagnetic materials, so the strength of the direct current magnetic field becomes flat along the running axis of the steel bar. Even when moving the steel bar at a high speed, the occurrence of noise due to changes in strength of the direct current magnetic field is suppressed.
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Kazuomi Tomita et al., “Multi-channel Karyuu Tanshou Souchi no Kaihatsu”, Zairyou to Process, Sep. 1993, vol. 6, No. 5, p. 1235., there is no translation.
Fujisaki Keisuke
Tomita Kazuomi
Ledynh Bot
Nippon Steel Corporation
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