The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 23, 2018
Filed:
Sep. 20, 2013
Centre National DE LA Recherche Scientifique, Paris, FR;
Universite Pierre ET Marie Curie (Paris 6), Paris, FR;
Christine Boue, Noisy le Grand, FR;
Gilles Tessier, Paris, FR;
Jean-Paul Roger, Cachan, FR;
Mihaela Streza, Cluj Napoca, RO;
CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE, Paris, FR;
UNIVERSITE PIERRE ET MARIE CURIE (PARIS 6), Paris, FR;
Abstract
The invention relates to a method for assessing the depth of a crack near the surface of a material, characterized in that said method includes the following steps: heating an area located near the crack using of a heat source () that is periodically modulatable into a heat flow at a controllable frequency, a so-called 'modulation frequency', varying the frequency so as to vary the heat diffusion length between an initial value, less than the distance between the heated area and the crack, and a final value that is greater than the distance between the heated area and the crack; determining the variation, depending on the heat diffusion length, in a function on the basis of at least one derivative, relative to a space variable, of the amplitude of the sinusoidal component of the temperature, on the surface of the material and at the modulation frequency, at each point of a set of points of the crack so as to cause a first area of variation in the function to appear, wherein said function increases at a first nonzero slope, followed by a second variation area, wherein said function increases at a second slope, different from the first slope; and assessing the depth of the crack on the basis of the value of the heat diffusion length at the intersection of the first variation area and the second variation area, the so-called 'intersection length'.