Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1989-11-21
1990-05-29
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
324229, 324 712, G01N 2782, G01R 3312, G01B 710
Patent
active
049298968
ABSTRACT:
A transient electromagnetic method for detecting irregularities on container walls by measuring wall thickness. The method utilizes a transmitting antenna and separate receiving antennas so as to form a loop-loop configuration. The transmitting antenna induces current into the container wall and the receiving antennas detect the induced current and produce received signals. The distance between the antennas and the container wall can vary, particularly where insulation is interposed therebetween. The variations in antenna distance affects the received signals. The affects are corrected by determining the maximum of the respective received signal and determining the arrival time of the maximum. The maximum and the arrival time are used to determine the thickness of the wall.
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patent: 4839593 (1989-06-01), Spies
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patent: 4843320 (1989-06-01), Spies
Atlantic Richfield Company
Eisenzopf Reinhard J.
Mantooth Geoffrey A.
Snow Walter E.
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