scholarly journals Pseudo-Spectrum Time Domain and Time Reversal Mirror technique using in Microwave-induced Thermo-Acoustic Tomography System

2011 ◽  
Vol 3 (3) ◽  
pp. 29-35
Author(s):  
Guoping Chen ◽  
Zhiqin Zhao ◽  
Qing.H. Liu
Keyword(s):  
Time Domain ◽  
Time Reversal ◽  
Acoustic Tomography ◽  
Tomography System ◽  
Time Reversal Mirror

The Computational Study of Microwave-Induced Thermo-Acoustic Tomography for Biologic Tissue Imaging Based on Pseudo-Spectrum Time Domain and Time Reversal Mirror Technique

2012 ◽  
Vol 195-196 ◽  
pp. 353-359 ◽  
Author(s):  
Guo Ping Chen ◽  
Zhi Qin Zhao ◽  
Qing H. Liu
Keyword(s):  
Time Domain ◽  
Time Reversal ◽  
Random Media ◽  
Imaging System ◽  
Malignant Tumors ◽  
Computational Study ◽  
Initial Pressure ◽  
Acoustic Tomography ◽  
Model Parameters ◽  
Time Reversal Mirror

Microwave-Induced Thermo-Acoustic Tomography (MITAT) own much concerns in recent years in biomedical imaging field. High contrast and resolution compared with conventional microwave or ultrasound imaging system especially for malignant tumors are outstanding characters of it. In this paper, the induced thermo-acoustic wave propagating in a mimic biologic tissue is simulated by numeric method Pseudo-Spectrum Time Domain (PSTD). Due to the excellent performance in noise-depress and the stability for the fluctuation of the model parameters, Time Reversal Mirror (TRM) imaging technique is studied computationally for the simulative received thermo-acoustic signals. Some thermo-acoustic objects with different initial pressure distribution are designed and imaged by TRM technique to represent the complex biologic tissue case in a random media. The quality of images generated by TRM technique based on PSTD method hints the potential of the MITAT technique.

Application of time reversal mirror technique in microwave-induced thermo-acoustic tomography system

2009 ◽  
Vol 52 (7) ◽  
pp. 2087-2095 ◽  
Author(s):  
GuoPing Chen ◽  
ZhiQin Zhao ◽  
WenJun Zheng ◽  
ZaiPing Nie ◽  
QingHuo Liu
Keyword(s):  
Time Reversal ◽  
Acoustic Tomography ◽  
Tomography System ◽  
Time Reversal Mirror

The Prototype of Microwave-Induced Thermo-Acoustic Tomography Imaging by Time Reversal Mirror

2008 ◽  
Vol 22 (11-12) ◽  
pp. 1565-1574 ◽  
Author(s):  
G. P. Chen ◽  
W. B. Yu ◽  
Z. Q. Zhao ◽  
Z. P. Nie ◽  
Q. H. Liu
Keyword(s):  
Time Reversal ◽  
Acoustic Tomography ◽  
Tomography Imaging ◽  
Time Reversal Mirror

scholarly journals M-ary nonlinear sine chirp spread spectrum for underwater acoustic communication based on virtual time-reversal mirror method

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Songzuo Liu ◽  
Habib Hussain Zuberi ◽  
Yi Lou ◽  
Muhmmad Bilal Farooq ◽  
Shahabuddin Shaikh ◽  
...  
Keyword(s):  
Acoustic Communication ◽  
Time Reversal ◽  
Spread Spectrum ◽  
Underwater Acoustic Communication ◽  
Half Cycle ◽  
Spreading Factor ◽  
Underwater Acoustic ◽  
Virtual Time ◽  
Chirp Spread Spectrum ◽  
Time Reversal Mirror

AbstractLinear chirp spread spectrum technique is widely used in underwater acoustic communication because of their resilience to high multipath and Doppler shift. Linear frequency modulated signal requires a high spreading factor to nearly reach orthogonality between two pairs of signals. On the other hand, nonlinear chirp spread spectrum signals can provide orthogonality at a low spreading factor. As a result, it improves spectral efficiency and is more insensitive to Doppler spread than the linear counterpart. To achieve a higher data rate, we propose two variants (half cycle sine and full cycle sine) of the M-ary nonlinear sine chirp spread spectrum technique based on virtual time-reversal mirror (VTRM). The proposed scheme uses different frequency bands to transmit chirp, and VTRM is used to improve the bit error rate due to high multipath. Its superior Doppler sensitivity makes it suitable for underwater acoustic communication. Furthermore, the proposed method uses a simple, low-power bank of matched filters; thus, it reduces the overall system complexity. Simulations are performed in different underwater acoustic channels to verify the robustness of the proposed scheme.

Demonstration of a high-frequency acoustic barrier with a time-reversal mirror

2003 ◽  
Vol 28 (2) ◽  
pp. 246-249 ◽  
Author(s):  
H. Song ◽  
W.A. Kuperman ◽  
W.S. Hodgkiss ◽  
T. Akal ◽  
P. Guerrini
Keyword(s):  
Time Reversal ◽  
High Frequency ◽  
Time Reversal Mirror
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