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Title: 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. 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.
Authors:
 [1] ;  [1]
  1. (Los Alamos, NM)
Publication Date:
OSTI Identifier:
866816
Report Number(s):
US 4798002
DOE Contract Number:
W-7405-ENG-36
Resource Type:
Patent
Research Org:
Los Alamos National Laboratory (LANL), Los Alamos, NM
Country of Publication:
United States
Language:
English
Subject:
wall; thickness; measuring; method; apparatus; apparatus; measuring; wall; thickness; nonmagnetic; article; housing; supporting; magnet; contiguous; supporting; surface; tubular; article; housing; releasably; secured; supporting; surface; support; optical; comparator; respectively; determine; wall; thickness; article; selected; magnetically; responsive; ball; positioned; tubular; article; retained; therein; means; magnetic; field; produced; magnet; thereafter; optical; comparator; employed; magnified; image; ball; screen; wall; thickness; selected; calculated; ball; surface; measurement; comparator; conjunction; previously; determined; base; line; measurement; supporting surface; supporting surface; field produced; wall thickness; wall thickness; wall thickness; wall thickness; magnetic field; thickness measuring; measuring method; tubular article; tubular article; housing supporting; releasably secure; magnetically responsive /33/356/