Title :
Study of time reversal in anisotropy
Author :
Zhang, Bixing ; Wang, Chenghao
Author_Institution :
Inst. of Acoust., Acad. Sinica, Beijing, China
Abstract :
In this paper, the time reversal method in anisotropic elastic solid is theoretically studied for the first time. The transversely-isotropic anisotropic medium (6mm) is modeled as the anisotropic elastic solid. And unidirectional glass-reinforced epoxy-fiber is chosen as the material of the 6mm anisotropic medium. Time reversal acoustic field is numerically investigated by ray approximation method. The focused acoustic field has different characteristics in different direction. The focused field is also symmetric about the principal axes. It is found that the width of the principal lobe of the focused acoustic field reaches the minimum in the maximum group velocity direction and reaches the maximum in the minimum group velocity direction. The relation of time reversal acoustic field to the parameters of anisotropic medium is also studied in detail
Keywords :
acoustic field; acoustic focusing; anisotropic media; glass fibre reinforced plastics; anisotropic elastic solid; focused acoustic field; group velocity; ray approximation method; self-adaptive focusing; time reversal acoustic field; transversely-isotropic anisotropic medium; unidirectional glass-reinforced epoxy-fiber; Acoustic beams; Acoustic distortion; Acoustic transducers; Anisotropic magnetoresistance; Approximation methods; Focusing; Nonhomogeneous media; Numerical simulation; Solid modeling; Surface waves;
Conference_Titel :
Ultrasonics Symposium, 2001 IEEE
Conference_Location :
Atlanta, GA
Print_ISBN :
0-7803-7177-1
DOI :
10.1109/ULTSYM.2001.991690
