Method and apparatus for detecting flaws in tubular metallic...

Details Method and apparatus for detecting flaws in tubular metallic... Method and apparatus for detecting flaws in tubular metallic...

G - Physics

01

N

324/50

G01N 27/90 (2006.01)

Patent

CA 1208291

ABSTRACT A remote field eddy current method and apparatus for inspecting the interior of metallic tubular members such as pipelines for defects are disclosed. The apparatus includes a source coil coupled to an alternating current power source and adapted to be moved through the pipeline with the flow of fluid therethrough. The source coil is disposed to produce an alter- nating magnetic field in the pipeline. A detector is disposed a remote distance from the source coil for detecting the remote field produced by the source coil and is adapted to be moved through the pipeline with the flow of fluid therethrough. The detector is responsive to small segments of the remote field around the internal perimeter of the pipeline and produces an individual signal for each segment. Processing circuitry coupled to the detector individually processes each of the individual signals. A display is coupled to the processor for displaying at least one characteristic of each individually processed signal. The individual signals are displayed in a correlatable manner.

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