Patent ID: 7911618
Filing Date: 2011-03-22
Classification: G01B

Abstract:
1. A method for detection of defects, flaws, anisotropies in a test article, said method comprising the steps of: placing the test article in a container with a transparent window wherein the transparent window of the test articles is made of glass plate to scatter the incident light thereby providing uniform heat flow on the transparent window uniformly heating the test articles, wherein the transparent window is placed at a small angle to the horizontal plane, the angle being greater than the arc sine of the L/H relation, where L is the greatest distance between the points of registration on the test article and light diffuser, and H is the distance between a diffuser and the transparent window thereby providing reception at photo registration of the beam that is reflected from the test article and simultaneously withdraws aside a patch of light from the transparent window; filling said container with argon; generating a hologram of the surface of the test article; recording said hologram by a suitable means; sending recorded information to a computer; thermally loading components on the test article by means of rapid heating; generating a subsequent hologram by the said method during or after said heating; comparing at least two of the holograms obtained to generate an interference pattern portrait, including information from at least two said holograms; analyzing said interference pattern portrait to determine features of the said interference pattern portrait that indicate defects, flaws, anisotropies in the said test article.