Excitation of leaky lamb waves in cranial bone using a phased array transducer in a concave therapeutic configuration

2017 ◽  
Vol 141 (5) ◽  
pp. 3918-3918 ◽  
Author(s):  
Chris Adams ◽  
James R. McLaughlan ◽  
Luzhen Nie ◽  
David Cowell ◽  
Thomas Carpenter ◽  
...  
Keyword(s):  
Phased Array ◽  
Lamb Waves ◽  
Cranial Bone ◽  
Array Transducer ◽  
Leaky Lamb Waves

Laser-induced thermoelastic Leaky Lamb waves at the fluid–solid interface

2011 ◽  
Vol 105 (2) ◽  
pp. 379-386 ◽  
Author(s):  
Chen Guang Xu ◽  
Bai Qiang Xu ◽  
Gui Dong Xu
Keyword(s):  
Lamb Waves ◽  
Solid Interface ◽  
Leaky Lamb Waves

scholarly journals Acousto-Optic Cells with Phased-Array Transducers and Their Application in Systems of Optical Information Processing

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 451
Author(s):  
Vladimir Balakshy ◽  
Maxim Kupreychik ◽  
Sergey Mantsevich ◽  
Vladimir Molchanov
Keyword(s):  
Phased Array ◽  
Power Conversion ◽  
Experimental Studies ◽  
Acoustic Power ◽  
Acoustic Mode ◽  
Bragg Angle ◽  
Excitation Band ◽  
Acousto Optic Interaction ◽  
Array Transducer ◽  
New Type

This paper presents the results of theoretical and experimental studies of anisotropic acousto-optic interaction in a spatially periodical acoustic field created by a phased-array transducer with antiphase excitation of adjacent sections. In this case, contrary to the nonsectioned transducer, light diffraction is absent when the optical beam falls on the phased-array cell at the Bragg angle. However, the diffraction takes place at some other angles (called “optimal” here), which are situated on the opposite sides to the Bragg angle. Our calculations show that the diffraction efficiency can reach 100% at these optimal angles in spite of a noticeable acousto-optic phase mismatch. This kind of acousto-optic interaction possesses a number of interesting regularities which can be useful for designing acousto-optic devices of a new type. Our experiments were performed with a paratellurite (TeO2) cell in which a shear acoustic mode was excited at a 9∘ angle to the crystal plane (001). The piezoelectric transducer had to nine antiphase sections. The efficiency of electric to acoustic power conversion was 99% at the maximum frequency response, and the ultrasound excitation band extended from 70 to 160 MHz. The experiments have confirmed basic results of the theoretical analysis.

Inter-costal Liver Ablation Under Real Time MR-Thermometry With Partial Activation Of A HIFU Phased Array Transducer

2010 ◽  
Author(s):  
Bruno Quesson ◽  
Mathilde Merle ◽  
Max Köhler ◽  
Charles Mougenot ◽  
Sebastien Roujol ◽  
...  
Keyword(s):  
Real Time ◽  
Phased Array ◽  
Mr Thermometry ◽  
Liver Ablation ◽  
Partial Activation ◽  
Array Transducer
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