应用激光, 2019, 39 (4): 690, 网络出版: 2019-10-12  

基于激光聚焦超声增强的聚焦超声特性研究

Focusing Ultrasound Enhancement Based on Laser Focused Ultrasound Enhancement
作者单位
1 国网重庆市电力公司电力科学研究院, 重庆 401123
2 国网重庆市电力公司, 重庆 400014
摘要
基于激光聚焦超声增强技术, 对聚焦超声特性进行了研究。结果表明, 采用激光聚焦超声增强实验系统测量聚焦超声特性, 结果显示, 随着激励电压的升高声功率逐渐升高, 在激励电压增加到85 V时声功率为169 W。通过对激励电源和超声换能器系统工作状态的稳定性、一致性验证, 为进一步研究超声特性的奠定了基础。采用仿真软件ANSYS10.0进行有限元分析, 从而获得热效应和超声持续时间的理论关系, 仿真表明在步数为45-105时, 温度值比较稳定。在超声持续时间为5 μs时, 系统最高温度升高0.001 5 ℃, 在超声持续时间增加到105 μs时升高0.054 0 ℃。这表明在测试实验中会产生极小热效应, 对测试产生的影响非常小。
Abstract
In this paper, the characteristics of focused ultrasound are studied based on laser focused ultrasound enhancement technology. The results show that the focused ultrasound characteristics are measured by the laser focused ultrasound enhancement system. The results show that the acoustic power increases gradually with the increase of the excitation voltage. When the excitation voltage increases by 85 V, the acoustic power reaches 169 W. By verifying the stability and consistency of the working state of the excitation power supply and the ultrasonic transducer system, it lays a foundation for further study of the ultrasonic characteristics. The finite element analysis is carried out with ANSYS10.0 software, and the theoretical relationship between thermal effect and ultrasonic duration is obtained. The simulation results show that the temperature value is stable when the step number is 45-105. The maximum temperature of the system increases by 0.001 5 ℃ when the duration of ultrasound is 5 μs and 0.054 ℃ when the duration of ultrasound increases to 105 μs. This shows that there will be a minimal thermal effect in the test experiment, and the impact on the test is very small.

李龙, 谭华勇, 周孟戈. 基于激光聚焦超声增强的聚焦超声特性研究[J]. 应用激光, 2019, 39(4): 690. Li Long, Tan Huayong, Zhou Mengge. Focusing Ultrasound Enhancement Based on Laser Focused Ultrasound Enhancement[J]. APPLIED LASER, 2019, 39(4): 690.

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