MODELING OF HARMONIC MEASUREMENT RADIATED BY A PLANE CIRCULAR PISTON IN FLUIDS

摘要：

In recent years,the use of nonlinear ultrasound in medical and industrial applications has increased rapidly.Harmonic signals,generated from nonlinear distortion of ultrasonic wave propagation in fluid or solid media,play an important role not only in ultrasonic medical imaging to provide higher resolution and higher contrast to tissue ratio,but also in nondestructive testing of fatigue cracks to provide higher sensitivity.We present a finite element model that embodies all the factors (diffraction,attenuation,receiver integration and tone-burst excitation) mentioned previously to describe the nonlinear characteristics of the ultrasonic field radiated by a plane circular piston source in fluids more accurately.A computer controlled ultrasonic system (RAM-5000 SNAP,Ritec Inc.) was used to verify the numerical predictions.The fundamental and the second harmonic versus axial distance are compared,and a reasonable agreement is achieved.

关键词： Nonlinear ultrasound Second harmonic Finite element modeling

作者: Zhi-wu AN Zhuo-chen WANG Hai-yang LI Xiao-ning JIANG

作者单位: State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing, 100 Department of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, North North University of China, Taiyuan, 030051, China

会议类型: 国际会议

会议名称: The 2016 Symposium on Piezoelectricity,Acoustic Waves and Device Applications(2016全国压电和声波理论及器件技术研讨会)

会议地点: 西安

会议语种:英文

页码: 288-292

在线出版日期: 2016-10-21（万方平台首次上网日期，不代表论文的发表时间）