Method, system and apparatus for ferromagnetic wall monitoring
First Claim
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1. A device for ferromagnetic wall monitoring comprising:
- a magnetic field generator for generating a magnetic field of flux, said magnetic field generator having an inner and outer circumference;
a plurality of groups of magnetic fluctuation detectors mounted about the magnetic field generator inner circumference;
each group of said plurality of groups of magnetic fluctuation detectors having a corresponding summing circuit interconnected therewith for separately adding together voltage outputs of all the magnetic fluctuation detectors in each group, thereby allowing determination of which group has a highest voltage output from among all of the groups; and
a searching head adapted to detect changes in lines of the magnetic field of flux due to an end of a ferromagnetic object, the searching head mounted about the outer circumference of the magnetic field generator.
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Abstract
A device and method is taught for detection of flaws and localized wall loss in pipes made of ferromagnetic-based material. The device utilizes a magnetic field generator to create a horizontal magnetic field of flux. A pipe is passed through the magnetic field where a magnetic fluctuation detector, for example multiple groups of hall units, identifies fluctuations in the magnetic field.
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Citations
31 Claims
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1. A device for ferromagnetic wall monitoring comprising:
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a magnetic field generator for generating a magnetic field of flux, said magnetic field generator having an inner and outer circumference; a plurality of groups of magnetic fluctuation detectors mounted about the magnetic field generator inner circumference; each group of said plurality of groups of magnetic fluctuation detectors having a corresponding summing circuit interconnected therewith for separately adding together voltage outputs of all the magnetic fluctuation detectors in each group, thereby allowing determination of which group has a highest voltage output from among all of the groups; and a searching head adapted to detect changes in lines of the magnetic field of flux due to an end of a ferromagnetic object, the searching head mounted about the outer circumference of the magnetic field generator. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A device for ferromagnetic wall monitoring comprising:
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a circular coil having multi-turns of wire located in the coil for generating a horizontal magnetic field of flux, said circular coil having an inner and outer circumference; a plurality of groups of hall units mounted about the circular coil inner circumference; each group of said plurality of groups of hail units having a corresponding summing circuit interconnected therewith for separately adding together voltage outputs of all the hall units in each group, thereby allowing determination of which group has a highest voltage output from among all of the groups; and a searching head adapted to detect changes in lines of the magnetic field of flux due to an end of a ferromagnetic object, the searching head mounted about the outer circumference of the magnetic field generator. - View Dependent Claims (13, 14, 15)
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16. A method for ferromagnetic wall monitoring, comprising the steps of:
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providing a magnetic field generator having a plurality of groups of magnetic field fluctuation detectors mounted about the inner circumference of the magnetic field generator, and a searching head able to detect magnetic field fluctuations due to an end of a ferromagnetic object, the searching head mounted about an outer circumference of the magnetic field generator; generating a magnetic field of flux with said magnetic field generator; passing the ferromagnetic object through said magnetic field of flux; separately adding together voltage outputs of all magnetic field fluctuation detectors in each of the groups thereby determining which group has a highest voltage output of the groups; determining wall thickness of and/or flaws in said ferromagnetic object by identifying magnetic field fluctuations with said plurality of magnetic field fluctuation detectors; and determining the end of said ferromagnetic object by detecting magnetic field fluctuations with said searching head. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A device for ferromagnetic wall monitoring comprising:
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a magnetic field generator for generating a magnetic field of flux, said magnetic field generator having an inner and outer circumference; a plurality of groups of magnetic fluctuation detectors mounted about the magnetic field generator inner circumference; each group of said plurality of groups of magnetic fluctuation detectors having a corresponding summing circuit interconnected therewith for separately adding together voltage outputs of all the magnetic fluctuation detectors in each group, thereby allowing determination of which group has a highest voltage output from among all of the groups; a searching head adapted to detect changes in lines of the magnetic field of flux due to an end of a ferromagnetic object; and an ore circuit interconnected with each magnetic fluctuation detector in each of said groups whereby a largest signal occurring in each of the groups is determined.
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30. A device for ferromagnetic wall monitoring comprising:
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a circular coil having multi-turns of wire located in the coil for generating a horizontal magnetic field of flux, said circular coil having an inner and outer circumference; a plurality of groups of hall units mounted about the circular coil inner circumference; each group of said plurality of groups of hall units having a corresponding summing circuit interconnected therewith for separately adding together voltage outputs of all the hail units in each group, thereby allowing determination of which group has a highest voltage output from among all of the groups; a searching head mounted adapted to detect changes in lines of the magnetic field of flux due to an end of a ferromagnetic object; and an ore circuit interconnected with each magnetic fluctuation detector in each of said groups whereby a largest signal occurring in each of the groups is determined.
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31. A method for ferromagnetic wall monitoring, comprising the steps of:
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providing a magnetic field generator having a plurality of groups of magnetic field fluctuation detectors mounted about an inner circumference of the magnetic field generator, and a searching head mounted in a position to detect magnetic field fluctuations due to an end of a ferromagnetic object; generating a magnetic field of flux with said magnetic field generator; passing the ferromagnetic object through said magnetic field of flux; separately adding together voltage outputs of all magnetic field fluctuation detectors in each of the groups thereby determining which group has a highest voltage output of the groups; determining wall thickness of and/or flaws in said ferromagnetic object by identifying magnetic field fluctuations with said plurality of magnetic field fluctuation detectors; and determining the end of said ferromagnetic object by detecting magnetic field fluctuations with said searching head; determining a largest signal occurring in each of the groups using an ore circuit interconnected with each magnetic fluctuation detector in each of said groups.
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Specification