Rotating eddy current roller head for inspecting tubing

Details Rotating eddy current roller head for inspecting tubing Rotating eddy current roller head for inspecting tubing

1989-04-24

1990-06-26

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Magnetic sensor within material

335441, 324262, G01N 2790

Patent

active

049375245

ABSTRACT:
A rotating eddy current roller head for inspecting tubing. A main body portion has a set of whisker wheels rotatably attached thereto which center the main body portion in the tube. A roller housing slidably mounted on the main body portion for radial movement relative thereto is caused to track the surface of the tube by opposing magnets mounted in the main body portion and roller housing. An eddy current coil is mounted in a coil holder which is pivotally mounted in an offset manner at the exterior end of the roller housing. A spring mounted in the roller housing biases the trailing edge of the coil holder against the surface of the tube to maintain the eddy current coil at a constant distance from the surface of the tube during inspection procedures.

REFERENCES:
patent: 2684464 (1954-07-01), Hastings et al.
patent: 3443211 (1969-05-01), Wood et al.
patent: 4441078 (1984-04-01), Lecomte
patent: 4550605 (1985-11-01), Bains
patent: 4625165 (1986-11-01), Rothstein
patent: 4675604 (1987-06-01), Moyer et al.
patent: 4772849 (1988-09-01), Tedder
patent: 4851773 (1989-07-01), Rothstein

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