Eddy current flaw detection sensor and method

Details Eddy current flaw detection sensor and method Eddy current flaw detection sensor and method

2008-04-15

2008-04-15

LeDynh, Bot (Department: 2862)

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

C324S242000, C324S243000

Reexamination Certificate

active

11680857

ABSTRACT:
An eddy current flaw detection sensor is provided which can detect a circumferential crack occurring at the deformed portion or peripheral portion thereof of a heat transfer tube with a high degree of sensitivity. Two excitation coils1a,1bcause eddy current B to flow in the axial direction of a tubular test object31.A detection coil2disposed between the excitation coils1a,1bdetects bypass eddy current D which flows in the circumferential direction of the test object31while bypassing a circumferential crack E. For this purpose, the coil axes of the excitation coils1a,1bare directed to the radial direction of the cylindrical protection member3and the coil axis of the detection coil2is directed to the axial direction of the protection member3.

REFERENCES:
patent: 4235020 (1980-11-01), Davis et al.
patent: 7256577 (2007-08-01), Linn et al.
patent: 06-160357 (1994-06-01), None
patent: 3406649 (2003-03-01), None
patent: 2003-149210 (2003-05-01), None

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