Title :
Theoretical and experimental study of time reversal in anisotropic medium
Author :
Zhang, Bixing ; Lu, Minghui ; Wang, Chenghao
Author_Institution :
Inst. of Acoust., Acad. Sinica, Beijing, China
Abstract :
The self-adaptive focusing of the time reversal in anisotropic media is studied theoretically and experimentally. It is conducted for the compressional wave field in the 6 mm and cubic crystals. The experimental result is in agreement with our theoretical analysis. For the time reversal in anisotropic medium, this is obtained for the first time. The focusing gain and the displacement distributions of the time reversal field are analyzed in detail. It is shown that the waves from different elements of the transducer array arrive at the original place of the source simultaneously after the time reversal operation. The waveform distortions caused by the velocity anisotropy can automatically be compensated for after the time reversal processing.
Keywords :
acoustic field; anisotropic media; focusing; ultrasonic transducer arrays; anisotropic media; compressional wave field; displacement distributions; focusing gain; self-adaptive focusing; time reversal field; transducer array; velocity anisotropy; waveform distortions; Acoustic beams; Acoustic distortion; Acoustic propagation; Acoustic transducers; Acoustic waves; Anisotropic magnetoresistance; Crystals; Nonhomogeneous media; Phase distortion; Silicon;
Conference_Titel :
Ultrasonics Symposium, 2004 IEEE
Print_ISBN :
0-7803-8412-1
DOI :
10.1109/ULTSYM.2004.1417962
