高强度聚焦超声换能器焦点峰值声压联合定征方法  

A Combined Measurement and Modeling Approach for Characterization of the Peak Sound Pressure at the Focus of High Intensity Focused Ultrasound Fields

作　　者：吴德林 张亨达 朱怀球 吴键 高申平 王宏远 俞醒言 郑音飞[3] 姚磊 WU Delin;ZHANG Hengda;ZHU Huaiqiu;WU Jian;GAO Shenping;WANG Hongyuan;YU Xingyan;ZHENG Yinfei;YAO Lei(Zhejiang Institute of Quality Sciences,Hangzhou,Zhejiang 310018,China;Key Laboratory of Acoustics and Vibration Applied Measuring Technology,State Administration for Market Regulation,Hangzhou,Zhejiang 310018,China;Zhejiang University,Hangzhou,Zhejiang 310027,China)

机构地区：[1]浙江省质量科学研究院,浙江杭州310018 [2]国家市场监督管理总局重点实验室(声学振动应用测量技术),浙江杭州310018 [3]浙江大学,浙江杭州310027

出　　处：《计量学报》2024年第11期1718-1723,共6页Acta Metrologica Sinica

基　　金：浙江省基础公益计划(LGF22A040005,TGC23A040003);浙江省重点研发计划(2022C01002);市场监督管理总局计划(KJLJ202310,2022MK046,2023MK048);浙江省市场监督管理局科技计划(CY2022216,CY2022001,ZD2024007,ZC2023015)。

摘　　要：采用实验测量与理论计算相结合的方式,提出一种高强度聚焦超声换能器焦点峰值声压联合定征方法。对于孔径60 mm、焦距75 mm的聚焦超声换能器,在水中测量并仿真模拟线性压力波形,修正得到聚焦超声换能器的有效孔径和焦距。在高强度激励下对调整后的换能器模型进行数值计算,用零相位滤波器不失真地得到各谐波的初始相位信息,发现二次谐波、三次谐波相对基波的相对相位量随激励强度基本不变。利用光纤水听器对高强度聚焦超声换能器的各次谐波声压幅值的测量,结合仿真分析得到相位关系,各次谐波叠加得到焦点峰值声压。聚焦超声换能器在峰峰值电压V_(p-p)为250 V激励下,焦点正峰值声压为7.56 MPa,负峰值声压为-4.98 MPa。A method to determine the focal peak sound pressure of the high intensity focused ultrasound field was proposed.Under low amplitude linear propagation conditions,linear pressure waveforms were measured and modeled in water a focused transducer with nominal aperture of 60mm and focal length of 75mm.The corrected parameters input to a Westervelt numerical model were determined based on experimental low amplitude beam plots.The simulated nonlinear waveforms at the focus were obtained,which were distorted strongly with a discrepancy between the peak compressional and rarefactional pressures.The first three harmonics were extracted from the distorted wave by a zero-phase band-pass filter,showing that the relative phases almost keep constant as the source pressure increases.Measurements were performed with a fiber optic probe hydrophone as the focused transducer driving with high-energy.Combined the measured pressure amplitudes with simulated phases of first three harmonics,the peak sound pressure at the focus was obtained.For this focused transducer driving in 250 V_(p-p),its peak compressional pressure is 7.56 MPa,and rarefactional pressure is 4.98 MPa.

关 键 词：声学计量 高强度聚焦超声 焦点 峰值声压 联合定征 非线性声场 

分 类 号：TB95[一般工业技术—计量学]