基于热图像的机载超声场可视化研究
Visualization of airborne ultrasound field using thermal images
摘要：
热声，热和声波之间的相互作用，被用于广泛的先进技术应用。将超声波转换成热量用于医学应用，包括肿瘤消融。然而，对空气超声波的热响应还没有得到广泛的研究。在这里，我们表明，热响应的高强度空气中的超声波1000帕以上，可用于声学测量。在网格屏幕上的热图像使得三维声场的实时可视化成为可能。基于反射超声波的表面上的温度分布，可以确定具有比波长更精细的分辨率的超声波焦点位置。我们的研究结果表明，基于超声温度转换的热成像观测可以用来可视化声场，这是传统上难以观察。我们的研究结果将推进使用强大的空中超声的技术，如空中触觉和声悬浮，并为检测表面特性和成分提供新的科学和技术工具，包括细胞和易碎材料。
英文摘要：
Thermoacoustics, the interaction between heat and acoustic waves, is used in a wide range of advanced technological applications. Conversion of ultrasound waves into heat is employed in medical applications, including tumor ablation. However, thermal responses to airborne ultrasounds have not been extensively studied. Herein, we show that thermal responses to high-intensity airborne ultrasounds above 1000 Pa can be used for acoustic measurements. Thermal images on a mesh screen enabled the real-time visualization of three-dimensional acoustic fields. Based on the temperature distribution on a surface that reflects ultrasound waves, it was possible to determine the ultrasound focus position with a resolution much finer than the wavelength. Our results demonstrate that thermography observations based on ultrasound-temperature conversion can be used to visualize acoustic fields, which are conventionally difficult to observe. Our findings will advance technologies that use strong airborne ultrasound, such as mid-air haptics and acoustic levitation, and provide new scientific and technical tools for detecting surface properties and composition, including cells and fragile materials.
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