Measurement of the acoustic nonlinearity parameter BIA of lossy medium in a focused field  

作　　者：ZHANG Dong, CHEN Xi & GONG XiufenState Key Laboratary of Modern Acoustics, Institute of Acoustics, Nanjing University, Nanjing 210093, China 

出　　处：《Chinese Science Bulletin》2000年第14期1283-1287,共5页

摘　　要：An analytical description for the linear and nonlinear acoustic fields in lossy medium of a focusing source is derived. The relationship of pressure amplitudes at focus for fundamental and the second harmonic waves is discussed. At high linear focusing gain G, a new method using the insert substitution method for measuring the acoustic nonlinear parameter BIA of biological tissues is presented. Results for some biological tissues are experimentally obtained.An analytical description for the linear and nonlinear acoustic fields in lossy medium of a focusing source is derived. The relationship of pressure amplitudes at focus for fundamental and the second harmonic waves is discussed. At high linear focusing gain G, a new method using the insert substitution method for measuring the acoustic nonlinear parameter BIA of biological tissues is presented. Results for some biological tissues are experimentally obtained.

关 键 词：focusing source acoustic NONLINEARITY PARAMETER INSERT SUBSTITUTION method. 

分 类 号：O422[理学—声学]