G - Physics – 01 – R
Patent
G - Physics
01
R
324/48
G01R 33/12 (2006.01) G01N 27/72 (2006.01) G01P 15/08 (2006.01)
Patent
CA 1296061
MAGNETIC BRIDGE DEVICES ABSTRACT OF THE DISCLOSURE Various devices are constructed with gap-modified magnetic bridge circuits. In a magnetic bridge device for evaluation of samples, a magnetic bridge circuit (10, 20, 30, 40, 40; 50) as at least four arms (P1-P2; A12-B12, A13-B13, A14-B14, A15-B15), a driving leg (A11) and a sensing leg (B11), one of the arms (A15-B15) being utilized for evaluating a sample (S), pole pieces (P1-P2) of a sample-evaluating arm having end faces defining between them a sample-evaluating gap (G15). An electrically conductive gap insert (C) produces an enhanced fringing flux exteriorly of it. The sample (S) is placed in juxtaposition to the sample-evaluating gap for affecting the fringing flux. A-driving circuit (WA1) for the driving leg provides a time-varying flux path within the four arms of the bridge. A sensing device (WB1) associated with the sensing leg senses changes in the sensing leg caused by changes in the fringing flux resulting from characteristics or movement of the sample. A specific single-side modification provides an accelerometer (40`). Other device embodiments may be used for evaluating a tubular structure (T), such as pipe, for detecting flaws within the pipe or other structure. In one form, the device (50) of the present invention is inserted wholly within the tubular structure, and includes driving and sensing legs (54,56) having axes which each intersect symmetrical axis of elongation of the structure and which are, themselves, mutually perpendicular, being preferably spaced apart along the direction of elongation to introduce time-varying flux within the walls of the structure four effective arms of the magnetic bridge, divided into quadrants of the structure. A structural anomaly in any quadrant causes an imbalance sensed by a coil wound about the sensing leg. The quadrantal magnetic flux components may extend both circumferentially and axially within the walls of the structure.
574802
Finlayson & Singlehurst
International Validators Inc.
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