The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 04, 1996
Filed:
Feb. 08, 1993
Kiyoto Kasai, Futtsu, JP;
Akio Ishii, Futtsu, JP;
Keisuke Asano, Futtsu, JP;
Shiro Sukenari, Oita, JP;
Nippon Steel Corporation, Tokyo, JP;
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.