Apparatus for measuring the thickness of the overlay clad in a p

Details Apparatus for measuring the thickness of the overlay clad in a p Apparatus for measuring the thickness of the overlay clad in a p

1994-10-07

1996-08-06

Wasil, Daniel D.

Induced nuclear reactions: processes, systems, and elements

Testing, sensing, measuring, or detecting a fission reactor...

Vessel monitoring or inspection

324230, G21C 1701, G01B 710

Patent

active

055442072

ABSTRACT:
A method of and an apparatus for measuring the thickness of the overlay clad of the pressure vessel of a nuclear reactor with good accuracy are disclosed. A magnetic yoke having an appropriate length and cross-sectional area of the magnetic path is placed closely in contact with the surface of the overlay clad of the pressure vessel of the nuclear reactor to form a magnetic path by the magnetic yoke and the pressure vessel of the nuclear reactor, the magnetic yoke is magnetized, the distribution of the magnetic field on or near the surface of the overlay clad in contact with which the magnetic yoke is closely placed is measured and the thickness of the overlay clad of the pressure vessel of the nuclear reactor is identified from the medium value or the half value width of the distribution of the magnetic field thus measured.

REFERENCES:
patent: 2679628 (1954-05-01), Matthews
patent: 3440527 (1969-04-01), Steingroever
patent: 4507609 (1985-03-01), Madewell
patent: 4553095 (1985-11-01), Schenk, Jr. et al.
patent: 5343146 (1994-08-01), Koch et al.
"Eddy Current Type Coated Film Thickness Sensor," Section 4, Magnetic Sensor Manual, Madwell, pp. 14-15, date unknown.

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