Wall thickness measuring method and apparatus
An apparatus for measuring the wall thickness of a nonmagnetic article having a housing supporting a magnet and a contiguous supporting surface is described. The tubular article and the housing are releasably secured to the supporting surface and a support member of an optical comparator, respectively. To determine the wall thickness of the article at a selected point, a magnetically responsive ball is positioned within the tubular article over the point and retained therein by means of a magnetic field produced by the magnet. Thereafter, an optical comparator is employed to project a magnified image of the ball on a screen and the wall thickness a the selected point is calculated by using a ball surface measurement taken with the comparator in conjunction with a previously determined base line measurement.
- Assignee:
- Dept. of Energy, Washington, DC
- Patent Number(s):
- US 4798002
- OSTI ID:
- 6026939
- Resource Relation:
- Patent File Date: Filed date 6 Oct 1987
- Country of Publication:
- United States
- Language:
- English
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FIRST WALL
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ELECTRONIC EQUIPMENT
OPTICAL EQUIPMENT
THERMONUCLEAR REACTOR WALLS
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