Electricity: measuring and testing – Magnetic – Magnetic sensor within material
Patent
1992-10-14
1995-03-28
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Magnetic sensor within material
324262, G01N 2783, G01R 3312
Patent
active
054020654
ABSTRACT:
The vehicle has two groups 24, 26 of foils which transfer flux to and return flux from a wall 10 of a pipeline. The flux is from a coil 20 or from a permanent magnet or magnets. Each group is a single group of common foil members 59 interleaved with spacers 69; or alternatively each group contains sets of common foil elements such as six sector-shaped sets, for example. Each foil 59 and each spacer 69 is cut from steel for example stainless steel. Each foil 25 is an outwardly-directed resiliently-deflectable foil integral with the common foil member forming an array around the vehicle. The foils are separated by slots 63 preferably V-shaped. The sets are clamped together by retainers 73 and pins 71. In the pipe 10 the foils deflect as indicated by broken lines 32, 34. The length of each foil is at least 200 times its thickness. The foil separation divided by their thickness is at least unity. Sensors 28 detect leakage flux due to metal loss from the wall.
REFERENCES:
patent: 3593122 (1971-07-01), Barton et al.
patent: 4105972 (1978-08-01), Smith
patent: 4310796 (1982-01-01), Braithwaite et al.
patent: 4447777 (1984-05-01), Sharp et al.
patent: 4855676 (1989-08-01), Cecco et al.
Ashworth Roger P.
Tabari Mehrdad Z.
British Gas plc
Edmonds Warren S.
Strecker Gerard R.
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