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| A Combined Measurement and Modeling Approach for Characterization of the Peak Sound Pressure at the Focus of High Intensity Focused Ultrasound Fields |
| WU Delin1,2,ZHANG Hengda1,2,ZHU Huaiqiu1,2,WU Jian1,2,GAO Shenping1,2,WANG Hongyuan1,3,YU Xingyan1,2,ZHENG Yinfei3,YAO Lei1,2 |
1. Zhejiang Institute of Quality Sciences, Hangzhou, Zhejiang 310018, China
2. Key Laboratory of Acoustics and Vibration Applied Measuring Technology, State Administration for Market Regulation, Hangzhou, Zhejiang 310018, China
3. Zhejiang University, Hangzhou, Zhejiang 310027, China |
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Abstract 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 250Vp-p, its peak compressional pressure is 7.56MPa, and rarefactional pressure is 4.98MPa.
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Received: 03 April 2024
Published: 29 November 2024
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2024, Vol. 45 
