Elimination of standing wave effects in ultrasound radiation force excitation in air using random carrier frequency packets

2011 ◽  
Vol 130 (4) ◽  
pp. 1838-1843 ◽  
Author(s):  
Thomas M. Huber ◽  
Nathaniel M. Beaver ◽  
Justin R. Helps
Keyword(s):  
Standing Wave ◽  
Carrier Frequency ◽  
Radiation Force ◽  
Ultrasound Radiation ◽  
Wave Effects ◽  
Force Excitation

scholarly journals Mathematical modeling and experimental study on solid–liquid suspension separation in ultrasonic standing wave field

2021 ◽  
pp. 146134842110229
Author(s):  
Yajing Wang ◽  
Liqun Wu ◽  
Yaxing Wang ◽  
Yafei Fan
Keyword(s):  
Standing Wave ◽  
Sound Pressure ◽  
Acoustic Radiation ◽  
Sound Field ◽  
Radiation Force ◽  
High Energy ◽  
Factors Affecting ◽  
Liquid Suspension ◽  
Ultrasonic Standing Wave ◽  
Solid Liquid

A new method of removing waste chips is proposed by focusing on the key factors affecting the processing quality and efficiency of high energy beams. Firstly, a mathematical model has been established to provide the theoretical basis for the separation of solid–liquid suspension under ultrasonic standing wave. Secondly, the distribution of sound field with and without droplet has been simulated. Thirdly, the deformation and movement of droplets are simulated and tested. It is found that the sound pressure around the droplet is greater than the sound pressure in the droplet, which can promote the separation of droplets and provide theoretical support for the ultrasonic suspension separation of droplet; under the interaction of acoustic radiation force, surface tension, adhesion, and static pressure, the droplet is deformed so that the gas fluid around the droplet is concentrated in the center to achieve droplet separation, and the droplet just as a flat ball with a central sag is stably suspended in the acoustic wave node.

Orthogonal Frequency Ultrasound Vibrometry

2010 ◽  
Author(s):  
Yi Zheng ◽  
Aiping Yao ◽  
Shigao Chen ◽  
Matthew W. Urban ◽  
Randy Kinnick ◽  
...  
Keyword(s):  
Wave Amplitude ◽  
Radiation Force ◽  
Sinusoidal Signal ◽  
Frequency Wave ◽  
Array Transducer ◽  
Ultrasound Radiation ◽  
Ultrasound Intensity ◽  
Tissue Region ◽  
Sinusoidal Signals ◽  
Frequency Ultrasound

New vibration pulses are proposed to increase the power of shear waves induced by ultrasound radiation force in a tissue region with a preferred spectral distribution. The new pulses are sparsely sampled from an orthogonal frequency wave composed of several sinusoidal signals. Those sinusoidal signals have different frequencies and are orthogonal to each other. The phase and amplitude of each sinusoidal signal are adjusted to control the shape of the orthogonal frequency wave. Amplitude of the sinusoidal signal is increased as its frequency increases to compensate for higher loss at higher frequency in the tissue region. The new vibration pulses and detection pulses can be interleaved for array transducer applications. The experimental results show that the new vibration pulses significantly increases induced tissue vibration with the same peak ultrasound intensity, compared with the binary vibration pulses.

Chirp excitation technique to enhance microbubble displacement induced by ultrasound radiation force

2009 ◽  
Vol 125 (3) ◽  
pp. 1410-1415 ◽  
Author(s):  
Yi Hu ◽  
Dong Zhang ◽  
Hairong Zheng ◽  
Xiufen Gong
Keyword(s):  
Radiation Force ◽  
Ultrasound Radiation

Temporal analysis of tissue displacement induced by a transient ultrasound radiation force

2005 ◽  
Vol 118 (5) ◽  
pp. 2829-2840 ◽  
Author(s):  
Samuel Callé ◽  
Jean-Pierre Remenieras ◽  
Olivier Bou Matar ◽  
Melouka Elkateb Hachemi ◽  
Frédéric Patat
Keyword(s):  
Radiation Force ◽  
Temporal Analysis ◽  
Ultrasound Radiation

Performance study of standing wave levitation with emitting and reflecting surface of concave sphere structure

2013 ◽  
Vol 227 (11) ◽  
pp. 2504-2516 ◽  
Author(s):  
Xiaoyang Jiao ◽  
Guojun Liu ◽  
Jianfang Liu ◽  
Xiaolun Liu
Keyword(s):  
Standing Wave ◽  
Spherical Surface ◽  
Radiation Force ◽  
Structural Parameter ◽  
Matlab Simulation ◽  
Performance Study ◽  
Ansys Software ◽  
Ultrasonic Standing Wave ◽  
Steel Balls ◽  
Reflecting Surface

In order to improve levitation capability and stability of ultrasonic standing wave, a novel levitation device was presented, which adopted concave spherical surface on the emitter and the reflector. Using ANSYS software, the acoustic field generated by the concave spherical emitting surface was analyzed and the formation of ultrasonic standing wave was simulated. Based on the simulation result, the distribution and maximum acoustic pressure under different radius of concave spherical surface on the emitter and the reflector were ascertained. Through the MATLAB simulation, the optimal structural parameter and levitation position were predicted. Based on the optimization result, the prototype of standing wave levitation device was designed and manufactured. In the laboratory, the radiation force was tested and levitation experiments were also carried out and the actual levitation position was in accordance with the simulation results. When the distance between the emitter and the reflector equaled to about 34.9 mm, three steel balls of 3 mm diameter could be levitated at the same time in three disparate nodes position, the levitation capability and stability were demonstrated to be enhanced largely.

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