Expandable eddy current probe for inspecting the interior of tub

Details Expandable eddy current probe for inspecting the interior of tub Expandable eddy current probe for inspecting the interior of tub

1985-01-22

1989-01-10

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Magnetic sensor within material

G01N 2772, G01N 2782, G01R 3312

Patent

active

047976136

ABSTRACT:
A probe (8) for inspecting the walls of a tubular conduit (40, 42) or the like is provided with a pair of movable arms (20a, 20b) urged outward from a central rod 4 into contact with the tube interior. Eddy current coils (16, 18) carried in the tube engaging ends (32a, 32b) of the arms (20a, 20b) are maintained in a constant, spaced apart relationship with the tube wall interior for increasing inspection accuracy and sensitivity. The movable arms (20a, 20b) can accommodate varying internal tube diameters, expanding and contracting relative to the central rod (4). A sloping nose (2) and tapered arm portions (32a, 32b) assist the probe in traversing the conduit interior.

REFERENCES:
patent: 3808696 (1974-05-01), Possati
patent: 4137639 (1979-02-01), Zumbach
patent: 4303884 (1981-12-01), Malick
patent: 4306455 (1981-12-01), Selleri
patent: 4438399 (1984-03-01), Schnabl et al.
patent: 4477777 (1984-05-01), Sharp et al.
patent: 4530161 (1985-07-01), Blankinship

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