Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1993-02-08
1996-06-04
O'Shea, Sandra L.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
324239, 324234, 32420726, 164 41, G01B 706, G01R 3312
Patent
active
055236855
ABSTRACT:
The present invention is a measuring method for detecting penetrant metal intruded in refractories having a conductive cover at a first wall and a nonconductive surface at a second wall and for measuring their thickness. At least one sensor head is used including a metal sensor with a first and second conductive coil for measuring distance between the sensor head and a conductive substance and a distance sensor for measuring distance between the sensor head and the refractories. The sensor head is disposed at a plurality of fixed positions close to the second wall to face the refractories and an alternating current is applied to the first coil to generate an eddy current in the conductive substance which faces the metal sensor. An induced voltage induced in the second coil by at least the eddy current is detected and a first distance is obtained between the sensor head and the conductive substance based on the detected induced voltage. The distance sensor measures a second distance between the sensor head and the second side wall at fixed positions and a third distance is obtained between the second side wall and the conductive substance. Also information is obtained about a relative position of the sensor head with respect to the molten metal vessel. A location and dimension of the penetrant metal and a thickness profile of the refractories is calculated based on the first, second and third distances and the relative position of the sensor head.
REFERENCES:
patent: 4859940 (1989-08-01), Hummert et al.
UK Patent Application, Method and apparatus for measurement of shell of a metal casting, Jan. 1985, Application No. GB 2142729A.
Asano Keisuke
Ishii Akio
Kasai Kiyoto
Sukenari Shiro
Nippon Steel Corporation
O'Shea Sandra L.
Patidar Jay M.
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