Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1979-12-12
1982-06-15
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
209567, 324227, 324239, G01R 3312, G01N 2772, B07C 5344
Patent
active
043353525
ABSTRACT:
This invention pertains to two forms of verifier of the grade of oil field tubular goods. The first form can be thought of as a sorter in that it will indicate when a particular length of tubular goods is of a different grade than its companions in a lot. The second form will identify the grade of a length. Both forms depend upon magnetizing or inducing magnetic eddy currents in the pipe which are detected and handled by the invention circuitry to sort or to identify.
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Kraska et al., Eddy Current Measurement of Magnetic Flux Density, Tech. Report AFML-TR-72-115, May 1972, Air Force Systems Command, pp. 1-27.
Staffin, Robt., 6 Ways to Measure Phase Angle Control Engineering, Oct. 1965, pp. 78-83.
Cabic Edward J.
Homco International Inc.
Strecker Gerard R.
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