Eddy current flaw detector utilizing plural sets of four planar

Details Eddy current flaw detector utilizing plural sets of four planar Eddy current flaw detector utilizing plural sets of four planar

1976-10-13

1978-08-15

Corcoran, Robert J.

Electricity: measuring and testing

Magnetic

Magnetic sensor within material

324227, 324238, G01R 3312

Patent

active

041076052

ABSTRACT:
The invention relates to a method and apparatus for the non-destructive testing of pipelines and is particularly concerned with the use of alternating eddy currents to investigate anomalies in the walls of pipelines of ferromagnetic material. A probe includes sensing coils which are connected in a bridge circuit. By employing spiral coils, placed with their axes normal to the surface of the pipeline wall, the apparatus is made less sensitive to variations in the spacing of the probe and sample. Use of biassing magnetic fields permits the detection of anomalies in pipeline walls of thickness substantially greater than the normal eddy current penetration depth.

REFERENCES:
patent: 3500181 (1970-03-01), Jackson
patent: 3518533 (1970-06-01), Arnelo
patent: 3568049 (1971-03-01), Barton
patent: 3916302 (1975-10-01), Madewell

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