Measurement of the sound pressure in the focal spot area of line-focus ultrasound field by Schlieren technique
Measurement of the sound pressure in the focal spot area of line-focus ultrasound field by Schlieren technique
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DOI：
10.1121/1.4708906
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发表时间：
2012-04
影响因子：
2.4
通讯作者：
Xueping Jiang;Qian Cheng;M. Qian
中科院分区：
文献类型：
--
作者：
Xueping Jiang;Qian Cheng;M. Qian
纹影法是研究透明介质中声场的一种有效方法。该方法通过分析声波引起的折射率变化来研究声场。计算了线聚焦超声换能器的辐射声压分布，得到了焦斑区域的声场。在此基础上，利用二维傅里叶变换计算了以超声波为位相对象时纹影系统中傅里叶变换平面上的衍射光强。由于变换透镜后焦面上不同衍射光斑的光强取决于声压，因此可以利用纹影技术确定焦斑区域的声压。建立了纹影系统。通过测量和比较，获得了线聚焦超声场的图像，并无创地测量了其焦点区域的声压。
Schlieren method is an effective method for studying the sound field in transparent medium which called phase objects. The method is used to research the acoustic field by analyzing the refractive index changes induced by the acoustic wave. Calculations of the sound pressure distribution radiated by the line-focus ultrasonic transducer are implemented, and the acoustic field in the focal spot area is obtained. Then the diffraction light intensity on the Fourier transform plane in a Schlieren system is calculated with two-dimensional Fourier transformation when the phase object is the ultrasonic wave. Because the light intensity of the different diffraction spots on the back focal plane of the transform lens depends on the sound pressure, the sound pressure in the focal spot area can be determined using Schlieren technique. A Schlieren system is set up. The images of the line-focus ultrasonic field are obtained and the sound pressure in its focal point area is measured non-invasively by measuring and compa...