| US 7,550,968 B2 | ||
| Measurement of wall thicknesses particularly of a blade, by eddy currents | ||
| Pierre-Yves Joubert, Paris (France); Yann Le Bihan, Malakoff (France); Olivier Lespinet, Corbeil Essonnes (France); and Aleksandra Mikic, La Garenne Colombes (France) | ||
| Assigned to SNECMA, Paris (France); and CNRS, Paris (France) | ||
| Filed on Apr. 25, 2007, as Appl. No. 11/739,972. | ||
| Claims priority of application No. 06 51493 (FR), filed on Apr. 26, 2006. | ||
| Prior Publication US 2008/0111543 A1, May 15, 2008 | ||
| Int. Cl. G01B 7/06 (2006.01) | ||
| U.S. Cl. 324—229 | 11 Claims |
| 1. A method for evaluating the thickness of a wall of a hollow part, with a curved surface, of a turbomachine blade, at least
at a point having a determined radius of curvature and thickness at said point, comprising:
providing a semicylindrical spacer having a determined radius of curvature in the range of the radii of curvature of said
surface and a thickness that varies along the longitudinal axis of said semicylindrical spacer,
determining impedance values of an electrical circuit formed by an eddy current detector applied to the wall, and
entering said impedance values into a digital processing unit of a neural network, wherein parameters of the neural have been
defined in advance by learning on said semicylindrical spacer.
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