HIGHER HARMONICS OF VIBRATING GAS-FILLED MICROSPHERES .1. SIMULATIONS
HIGHER HARMONICS OF VIBRATING GAS-FILLED MICROSPHERES .1. SIMULATIONS
复制标题
DOI：
10.1016/0041-624x(94)90064-7
复制
发表时间：
1994-11-01
期刊：
影响因子：
4.2
通讯作者：
LANCEE, CT
中科院分区：
文献类型：
--
作者：
DEJONG, N;CORNET, R;LANCEE, CT
考虑了理想气泡在水中的声学特性，并将其运动方程推广到Albunex微球模型。计算表明，理想气泡和Albunex微球在非线性行为上存在很大差异，这是由于围绕Albunex微球的外壳有额外的恢复力和内部摩擦。使用Albunex造影剂进行的模拟进一步表明，最佳驱动频率为1 MHz，在声压为50 kPa时，产生的二次谐波比一次谐波低20 dB。当驱动频率为2 MHz时，差异增加到25 dB。
The acoustic behaviour of an ideal gas bubble in water is considered and the equation of motion is extended to model an Albunex microsphere. Calculations reveal large differences in non-linear behaviour between ideal gas bubbles and Albunex microspheres, due to the additional restoring force of, and friction inside, the shell that surrounds the Albunex microsphere. Simulations with the Albunex contrast agent further reveal that the optimal driving frequency is 1 MHz, resulting in a second harmonic that is 20 dB below the first harmonic at an acoustic pressure of 50 kPa. The difference increases to 25 dB for a driving frequency of 2 MHz.