Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Reissue Patent
2008-03-25
2008-03-25
LeDynh, Bot (Department: 2862)
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
C324S235000, C324S240000
Reissue Patent
active
10640107
ABSTRACT:
A magnetic non-destructive method and an apparatus for measurement of cross sectional area of elongated ferrous objects such as steel wire ropes and for detecting local flaws is disclosed. A section of a wire rope is magnetized by longitudinally spaced magnetic poles. A magnetic field parameter, e.g. magnetic flux density, is measured in, by at least, one pair of points between the poles of magnetizing device (in an inter-pole area) at the object under test surface. The pair of points is formed by two sensors placed in the inter-pole area along a direct line parallel to the rope axis. The rope cross sectional area corresponds to a sum of the sensor pair signals. Local flaws, such as broken wires and pitting corrosion in the rope, is detected by a first differences of signals of the sensor pair. At least one additional magneto-sensitive sensor is located radially inward of the poles and weight coefficient A depending on a nominal value of the rope cross sectional area is subtracted from the sum of signals of the sensor pair thereby providing a second difference of the signals corresponding to the rope cross sectional area. The coefficient A value is chosen to get the minimum value of the second signal difference while the magnetizing device and all the sensors are placed onto the rope having a nominal value of a cross sectional area. A sensor unit in the inter-pole area includes a magnetic core in form of three longitudinally spaced ferrous elements. Pairs of the sensors are located in the gaps along a direct line parallel to the rope. Two embodiments of the magnetic heads are disclosed: the hollow cylinder-shaped one and the U-shaped one.
REFERENCES:
patent: 4659991 (1987-04-01), Weischedel
patent: 5565771 (1996-10-01), Hamelin et al.
patent: 5804964 (1998-09-01), Hamelin et al.
Belitsky Serguei Borisovich
Sukhorukov Vasily Vasilievich
Harter Secrest & Emery LLP
Intron Plus, Ltd.
LeDynh Bot
Sabi, Esq. Stephen B.
Shaw, Esq. Brian
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