scholarly journals Time reversal kaleidoscope: A smart transducer for three-dimensional ultrasonic imaging

2004 ◽  
Vol 84 (19) ◽  
pp. 3879-3881 ◽  
Author(s):  
Gabriel Montaldo ◽  
Delphine Palacio ◽  
Mickael Tanter ◽  
Mathias Fink
Keyword(s):  
Time Reversal ◽  
Ultrasonic Imaging ◽  
Three Dimensional ◽  
Smart Transducer

Imaging Cracks in Bones Using Acoustic Nonlinearity: A Simulation Study

2011 ◽  
Vol 97 (5) ◽  
pp. 728-733
Author(s):  
Yang Liu ◽  
Xiasheng Guo ◽  
Zhao Da ◽  
Dong Zhang ◽  
Xiufen Gong
Keyword(s):  
Time Reversal ◽  
Three Dimensional ◽  
Harmonic Component ◽  
Ultrasonic Signal ◽  
Long Bone ◽  
Third Harmonic ◽  
Acoustic Nonlinearity ◽  
The Third ◽  
Nonlinear Approach ◽  
Radial Depth

This article proposes an acoustic nonlinear approach combined with the time reversal technique to image cracks in long bones. In this method, the scattered ultrasound generated from the crack is recorded, and the third harmonic nonlinear component of the ultrasonic signal is used to reconstruct an image of the crack by the time reversal process. Numerical simulations are performed to examine the validity of this approach. The fatigue long bone is modeled as a hollow cylinder with a crack of 1, 0.1, and 0.225 mm in axial, radial and circumferential directions respectively. A broadband 500 kHz ultrasonic signal is used as the exciting signal, and the extended three-dimensional Preisach-Mayergoyz model is used to describe the nonclassical nonlinear dynamics of the crack. Time reversal is carried out by using the filtered third harmonic component. The localization capability depends on the radial depth of the crack.

Three-Dimensional Lightning Positioning in Low-Frequency Band Using Time Reversal in Frequency Domain

2020 ◽  
Vol 62 (3) ◽  
pp. 774-784 ◽  
Author(s):  
Bo Liu ◽  
Li-Hua Shi ◽  
Shi Qiu ◽  
Heng-Yi Liu ◽  
Zheng Sun ◽  
...  
Keyword(s):  
Frequency Domain ◽  
Frequency Band ◽  
Time Reversal ◽  
Three Dimensional ◽  
Low Frequency
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