Measurement of focused ultrasonic fields using a scanning laser vibrometer.
Measurement of focused ultrasonic fields using a scanning laser vibrometer.
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DOI：
10.1121/1.2713708
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发表时间：
2007-05
期刊：
影响因子：
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通讯作者：
Yuebing Wang;J. Tyrer;Ping Zhihong;W. Shiquan
中科院分区：
文献类型：
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作者：
Yuebing Wang;J. Tyrer;Ping Zhihong;W. Shiquan
随着光学技术的发展，扫描激光测振仪已成功应用于超声场中粒子速度和分布的测量。在本文中，为了开发测量小振幅聚焦场的光学干涉技术，提出了用于平面波和扩展用于球面波的“有效”折射率，模拟了作为激光束入射角函数的压电光学效应，并数值计算了凹球面换能器在其焦点区域周围产生的超声场。为了验证光学方法检测聚焦超声场的可行性，建立了利用扫描激光测振仪和膜水听器的测量系统。在聚焦换能器的不同区域进行了测量，并且在声波以平面形式或球形形式传播的区域中通过光学干涉测量获得了良好的结果。利用光学方法获得的数据重建声场，发现可以准确预测换能器的焦平面、最大压力和波束宽度。
With the development of optical techniques, scanning laser vibrometers have been applied successfully in measuring particle velocities and distributions in ultrasonic fields. In this paper, to develop the optical interferometry in measuring focused fields with small amplitude, the "effective" refractive index used for plane waves and extended for spherical waves is presented, the piezo-optic effect as a function of the incident angle of the laser beam is simulated, and the ultrasonic field produced by a concave spherical transducer is calculated numerically around its focal region. To verify the feasibility of the optical method in detecting focused ultrasonic fields, a measurement system was set up that utilized both a scanning laser vibrometer and a membrane hydrophone. Measurements were made in different zones of a focusing transducer, and good results were acquired from the optical interferometry in regions where acoustic waves travel in plane form or spherical form. The data obtained from the optical method are used to reconstruct acoustic fields, and it is found that the focal plane, the maximum pressure, and the beamwidth of the transducer can be forecasted accurately.