Quasi-Paraxial Acoustic Field Approximation for Phased Arrays

1989 ◽  
Vol 11 (4) ◽  
pp. 260-272
Author(s):  
Ke-Ou Peng ◽  
Marcel R. de la Fonteijne
Keyword(s):  
Field Distribution ◽  
Acoustic Field ◽  
Focal Plane ◽  
Phased Arrays ◽  
Computation Time ◽  
Acoustic Vibration ◽  
Field Approximation ◽  
Scanning Angle ◽  
Geometrical Characteristics ◽  
Special Element

The quasi-paraxial theory for phased arrays presented here can be used to estimate and analyze the acoustic field in the focal plane for a large scanning angle. The transient acoustic field is considered as the product of two terms that describe the time characteristics of the acoustic vibration over the array and the geometrical characteristics of the array, respectively. This method requires little computation time. The influence of special element shapes and functions that modulate the amplitude of the element vibration on the field distribution is also investigated.

Thermal Bubble Dynamics Under the Effect of Acoustic Vibration

2009 ◽  
Author(s):  
Xiaopeng Qu ◽  
Huihe Qiu
Keyword(s):  
Heat Transfer ◽  
Acoustic Field ◽  
Vapor Bubble ◽  
Boiling Heat Transfer ◽  
High Speed ◽  
Bubble Dynamics ◽  
Acoustic Vibration ◽  
Micro Electro Mechanical System ◽  
Mems Technology ◽  
Enhanced Boiling

The effect of acoustic field on the dynamics of micro thermal bubble is investigated in this paper. The micro thermal bubbles were generated by a micro heater which was fabricated by standard Micro-Electro-Mechanical-System (MEMS) technology and integrated into a mini chamber. The acoustic field formed in the mini chamber was generated by a piezoelectric plate which was adhered on the top side of the chamber’s wall. The dynamics and related heat transfer induced by the micro heater generated vapor bubble with and without the existing of acoustic field were characterized by a high speed photograph system and a micro temperature sensor. Through the experiments, it was found that in two different conditions, the temperature changing induced by the micro heater generated vapor bubble was significantly different. From the analysis of the high speed photograph results, the acoustic force induced micro thermal bubble movements, such as forcibly removing, collapsing and sweeping, were the main effects of acoustic enhanced boiling heat transfer. The experimental results and theoretical analysis were helpful for understanding of the mechanisms of acoustic enhanced boiling heat transfer and development of novel micro cooling devices.

Numerical Simulation of Acoustic Field for the Miniature Cylindrical Transducer with a Rectangular Hole

2011 ◽  
Vol 421 ◽  
pp. 739-742
Author(s):  
Li Li Yu ◽  
Jin Hua Zhao ◽  
Quan Zhou Zhao ◽  
Chun Hui
Keyword(s):  
Numerical Simulation ◽  
Acoustic Field ◽  
Focal Plane ◽  
Optimization Design ◽  
Acoustic Pressure ◽  
Pressure Amplitude ◽  
Hole Size ◽  
Rectangular Hole ◽  
Cylindrical Transducer ◽  
Focusing Properties

In this paper the characteristics of acoustic field for miniature cylindrical focused transducer with a hole was studied in order to instruct the optimization design of the transducer for both realizing visualization and improving the treatment effect. Then the acoustic field was simulated numerically with different parameters of hole. It is found that position of focus is almost unchanged but acoustic pressure amplitude declines. In addition the performance of transverse focusing for the focal plane and levels length of acoustic pressure are lowered. Moreover, if size of transducer and rigidity of material permit, the area and ratio of width to height for the hole should be reduced appropriately to improve the focusing properties. And it is deduced that area and ratio of width to height for the cylinder can be increased to achieve the same therapeutic effect with a fixed hole size.

Impact of Immersion Depth of Ultrasonic Horn on Acoustic Field Distribution Using Thermoelectric Probe

2012 ◽  
Vol 455-456 ◽  
pp. 65-68
Author(s):  
Hong Xing Dong ◽  
Xiao Guang Yang ◽  
Guo Jun Yue ◽  
Jin Yong Tang ◽  
Yuan Lv ◽  
...  
Keyword(s):  
Field Distribution ◽  
Acoustic Field ◽  
Immersion Depth

Acoustic field approximation with sparse arrays through optimization

2017 ◽  
Vol 142 (4) ◽  
pp. 2488-2488
Author(s):  
Lane P. Miller ◽  
Stephen C. Thompson ◽  
Andrew Dittberner
Keyword(s):  
Acoustic Field ◽  
Field Approximation ◽  
Sparse Arrays

scholarly journals Synthesis Of Ultrasound Field Sources Based on Phase Screen Approximation

2018 ◽  
Vol 155 ◽  
pp. 01011
Author(s):  
Dmitry Sukhanov ◽  
Ksenia Zavyalova ◽  
Nadezhda Erzakova
Keyword(s):  
Acoustic Field ◽  
Phased Arrays ◽  
Phase Screen ◽  
Experimental Setup ◽  
Ultrasound Field ◽  
Vortex Field

Here is proposed the method for synthesizing the sources of an acoustic field on the basis of an approximation of the phase screen. The technology of manufacturing ultrasonic phased arrays providing the formation of a field of a given distribution is proposed. An experimental setup has been developed for the formation of a vortex field at a distance of 10 cm.

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