Patent ID: 6493420
Filing Date: 2002-12-10
Classification: G01N

Abstract:
An apparatus for in-situ measurement of residual surface stresses, comprising:a compact x-ray tube; a tube sleeve coupled to said compact x-ray tube; a first fiber optic bundle coupled to said tube sleeve; a second fiber optic bundle coupled to said tube sleeve; a charged coupled device coupled to said first fiber optic bundle; and second fiber optic bundle; wherein x-rays emitted by said x-ray tube are diffracted from a specimen surface and intercepted by said first fiber optic bundle and said second fiber optic bundle; wherein said intercepted x-rays are converted into light and transferred by said first fiber optic bundle and second fiber optic bundle to said charged coupled device; wherein intensities of said received light are detected and digitized to generate a first ring and a second ring; and wherein the residual stress in said specimen surface is calculated based on a difference between the radii of said first ring and said second ring.