Wall thickness measuring method and apparatus
- Los Alamos, NM
An apparatus for measuring the wall thickness of a nonmagnetic article having a housing supporting a magnet and a contiguous supporting surface. 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 said 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 at the selected point is calculated by using a ball surface measurement taken with the comparator in conjunction with a previously determined base line measurement.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- DOE Contract Number:
- W-7405-ENG-36
- Assignee:
- United States of America as represented by United States (Washington, DC)
- Patent Number(s):
- US 4798002
- OSTI ID:
- 866816
- Country of Publication:
- United States
- Language:
- English
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thickness
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method
apparatus
nonmagnetic
article
housing
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magnet
contiguous
surface
tubular
releasably
secured
support
optical
comparator
respectively
determine
selected
magnetically
responsive
ball
positioned
retained
therein
means
magnetic
field
produced
thereafter
employed
magnified
image
screen
calculated
measurement
conjunction
previously
determined
base
line
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field produced
wall thickness
magnetic field
thickness measuring
measuring method
tubular article
housing supporting
releasably secure
magnetically responsive
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