Investigation of thermomechanical motion in a nanomechanical resonator based on optical intensity mapping
| Autor: | Sungwan Cho, Sang Goon Kim, Kimin Hong, Seung-Bo Shim, Myunglae Jo, Sung Un Cho, Yun Daniel Park |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Hydrophone Computer simulation medicine.medical_treatment Acoustics General Physics and Astronomy 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences High-intensity focused ultrasound Intensity (physics) Nonlinear system Transducer 0103 physical sciences medicine Waveform 010306 general physics 0210 nano-technology MATLAB computer computer.programming_language |
| Zdroj: | Journal of the Korean Physical Society. 71:684-691 |
| ISSN: | 1976-8524 0374-4884 |
| DOI: | 10.3938/jkps.71.684 |
| Popis: | In the present study, the acoustic field of a high intensity focused ultrasound (HIFU) transducer in water was measured by using a commercially available needle hydrophone intended for HIFU use. To validate the results of hydrophone measurements, numerical simulations of HIFU fields were performed by integrating the axisymmetric Khokhlov-Zabolotskaya-Kuznetsov (KZK) equation from the frequency-domain perspective with the help of a MATLAB-based software package developed for HIFU simulation. Quantitative values for the focal waveforms, the peak pressures, and the size of the focal spot were obtained in various regimes of linear, quasilinear, and nonlinear propagation up to the source pressure levels when the shock front was formed in the waveform. The numerical results with the HIFU simulator solving the KZK equation were compared with the experimental data and found to be in good agreement. This confirms that the numerical simulation based on the KZK equation is capable of capturing the nonlinear pressure field of therapeutic HIFU transducers well enough to make it suitable for HIFU treatment planning. |
| Databáze: | OpenAIRE |
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