Title :
Optimization techniques and impulse acoustic microscopy: towards an absolute characterization of anisotropic materials
Author_Institution :
CEA, Is-sur-Tille
Abstract :
Deals with the theoretical prediction of the impulse response of materials achieved by a special surface acoustic microscope operating in the MHz frequency range. This is applied to a lensless transducer with a line focus (cylindrical shape) in order to characterize anisotropic materials. A one dimensional (1 D) modelling is developed and then validated by comparison between experiments and theoretical predictions. By means of an optimization technique, this modelling tends to solve the inverse problem of the elastic constant evaluation applied to rolled materials
Keywords :
acoustic microscopy; inverse problems; modelling; optimisation; absolute characterization; anisotropic materials; cylindrical shape; elastic constant evaluation; frequency range; impulse acoustic microscopy; impulse response; inverse problem; lensless transducer; line focus; one dimensional modelling; optimization technique; rolled materials; special surface acoustic microscope; theoretical prediction; Acoustic materials; Acoustic pulses; Acoustic transducers; Anisotropic magnetoresistance; Fourier transforms; Frequency; Microscopy; Optical materials; Shape; Surface acoustic waves;
Conference_Titel :
Ultrasonics Symposium, 1997. Proceedings., 1997 IEEE
Conference_Location :
Toronto, Ont.
Print_ISBN :
0-7803-4153-8
DOI :
10.1109/ULTSYM.1997.663100
