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相关概念视频

Excess Pressure Inside a Drop and a Bubble01:13

Excess Pressure Inside a Drop and a Bubble

The shape of a small drop of liquid can be considered spherical, neglecting the effect of gravity. This drop can further be considered as two equal hemispherical drops put together due to surface tension. The forces acting on the spherical drop are due to the pressure of the liquid inside the drop, the pressure due to air outside the drop, and the force due to the surface tension acting on the two hemispherical drops.
Sound as Pressure Waves01:17

Sound as Pressure Waves

Sound waves, which are longitudinal waves, can be modeled as the displacement amplitude varying as a function of the spatial and temporal coordinates. As a column of the medium is displaced, its successive columns are also displaced. As the successive displacements differ relatively, a pressure difference with the surrounding pressure is created. The gauge pressure varies across the medium.
The pressure fluctuation depends on the difference in displacements between the successive points in the...

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相关实验视频

Updated: Jul 3, 2026

Imaging and Quantification of the Area of Fast-Moving Microbubbles Using a High-Speed Camera and Image Analysis
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近场声学成像使用中的气泡.

Dorian Bouchet1, Olivier Stephan1, Benjamin Dollet1

  • 1Univ. Grenoble Alpes, CNRS, LIPhy, 38000 Grenoble, France.

Nature communications
|November 28, 2024
PubMed
概括

研究人员开发了一种使用子泡进行高分辨率声学显微镜的新方法. 这种技术使复杂结构的近场成像具有前所未有的细节,推进声学成像能力.

科学领域:

  • 声学 声学 在声学方面
  • 材料科学 材料科学 材料科学
  • 显微镜的使用方法

背景情况:

  • 气泡在各种领域至关重要,如超声波成像和研究自然现象.
  • 在声学上,气泡是共振散射器,具有很大的散射截面和子波长大小.
  • 探测单个泡环境相互作用是困难的,因为操纵挑战.

研究的目的:

  • 开发一种探测单泡环境相互作用的方法.
  • 用单个泡泡来演示使用子波长分辨率的近场成像.
  • 探索子气泡在低成本声学显微镜中的潜力.

主要方法:

  • 将一个立方气泡限制在一个3D打印的子里.
  • 利用中的泡作为声学扫描的局部探测器.
  • 执行扫描近场声学显微镜 (SNAM).

主要成果:

  • 演示了复杂结构的近场成像.
  • 实现了比声波长小两倍的分辨率.
  • 成功地将一个单一的共振气泡用作声学探针.

结论:

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  • 子泡泡方法使得高分辨率的声学显微镜成为可能.
  • 这种技术提供了一种新的方法,可以在微观尺度上研究泡环境相互作用.
  • 该方法对开发负担得起的声学显微镜具有前景.