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Laser-ultrasound spectroscopy apparatus and method with detection of shear resonances for measuring anisotropy, thickness, and other properties

United States Patent

6,057,927
May 2, 2000
View the Complete Patent at the US Patent & Trademark Office
Apparatus and method for detecting shear resonances includes structure and steps for applying a radiation pulse from a pulsed source of radiation to an object to generate elastic waves therein, optically detecting the elastic waves generated in the object, and analyzing the elastic waves optically detected in the object. These shear resonances, alone or in combination with other information, may be used in the present invention to improve thickness measurement accuracy and to determine geometrical, microstructural, and physical properties of the object. At least one shear resonance in the object is detected with the elastic waves optically detected in the object. Preferably, laser-ultrasound spectroscopy is utilized to detect the shear resonances.
Levesque; Daniel (Terrebonne, CA), Moreau; Andre (St-Bruno-de-Montarville, CA), Dubois; Marc (Montreal, CA), Monchalin; Jean-Pierre (Montreal, CA), Bussiere; Jean (St-Bruno, CA), Lord; Martin (Beloeil, CA), Padioleau; Christian (Montreal, CA)
American Iron and Steel Institute (Washington, DC)
09/ 030,400
February 25, 1998
STATEMENT OF GOVERNMENT RIGHTS This invention was made with Government support under Contract No. DE-FC07-93ID13205 awarded by the Department of Energy. The Government has certain rights in this invention.