Electricity: measuring and testing – Magnetic – With means to create magnetic field to test material
Patent
1988-12-29
1990-05-29
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
With means to create magnetic field to test material
324225, 324229, G01N 2790, G01R 3312, G01B 710
Patent
active
049298984
ABSTRACT:
A transient electromagnetic method for detecting irregularities on container walls by measuring wall thickness. The method utilizes a transmitting antenna and a separate receiving antenna arranged in a loop-loop configuration. The transmitting antenna induces current into the container wall and the receiving antenna and the receiver detect the decay of the induced current, which is then analyzed to detect wall thickness. A receiving antenna array of many receiving antennas is used to increase the spatial resolution. Simultaneous measurement of the induced current by the receiving antennas reduces noise that is coherent across the array. Use of a noise antenna located so as to be unaffected by the transmitting antenna further reduces noise. The received signal from the receiving antenna array is displayed on a two-dimensional display in a spatial arrangement that corresponds to the spatial arrangement of the receiving antennas. The display can be scrolled over the time range of the received signals to produce a moving image, so that irregular areas can be more easily detected than with a static display.
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Atlantic Richfield
Mantooth Geoffrey A.
Strecker Gerard R.
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