Electricity: measuring and testing – Magnetic – Calibration
Patent
1983-11-18
1986-03-25
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Magnetic
Calibration
324262, 73 1R, G01R 3500, G01N 2782
Patent
active
045786437
ABSTRACT:
An apparatus for simulating and analyzing discontinuities in a tube using eddy current inspection techniques is disclosed. The simulation apparatus includes inner and outer tubular members arranged to define an annular chamber having a predetermined tubular configuration corresponding to the tubular configuration of a tube under investigation. The outer tubular member has an opening through the wall thereof and the inner tubular member defines an axially extending hollow interior. A supply of electrically conductive liquid material is provided in the annular chamber, the quantity of liquid material being such as to substantially and completely fill the annular chamber in the vicinity of the opening through the wall of the outer tubular member. A defect simulation member is supported in the opening in the outer tubular member for movement along a predetermined direction extending transverse to the axis of the inner tubular member. Further, an eddy current test probe is positioned in the hollow interior of the inner tubular member adjacent the position of the defect simulation member for generating eddy current responses which are representative of the eddy current responses which would be obtained for a tube having a configuration corresponding to the predetermined tubular configuration and having a discontinuity in the wall thereof corresponding to the predetermined type of discontinuity.
REFERENCES:
patent: 3441840 (1969-04-01), Randle
patent: 3582772 (1971-06-01), Hammer
patent: 3609529 (1971-09-01), Skubiak et al.
Cowfer et al., "Flaw Simulator for Eddy Current Probe Calibration", Calibration Devices and Techniques, NASA Pub. #SP-5907, 1974, p. 21.
Aldeen et al., "Eddy-Current Investigations of Oblique Longitudinal Cracks in Metal Tubes Using a New Mercury Model", NDT International, Oct., 1979, pp. 211-216.
Chizmar David A.
Junker Warren R.
Taszarek Bruce J.
DePaul L. A.
Edmonds Warren S.
Eisenzopf Reinhard J.
Westinghouse Electric Corp.
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