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相关概念视频

Modes of Standing Waves - I01:03

Modes of Standing Waves - I

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A close look at earthquakes provides evidence for the conditions appropriate for resonance, standing waves, and constructive and destructive interference. A building may vibrate for several seconds with a driving frequency matching the building's natural frequency of vibration; this produces a resonance that results in one building collapsing while the neighboring buildings do not. Often, buildings of a certain height are devastated, while other taller buildings remain intact. This...
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Standing Waves in a Cavity01:28

Standing Waves in a Cavity

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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
903
Modes of Standing Waves: II01:04

Modes of Standing Waves: II

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The starting point for expressing the modes of standing waves is understanding the boundary conditions that the waves must follow. The boundary conditions are derived from the physical understanding of how the standing waves are sustained, that is, how the vibrating particles of the medium behave at the boundaries imposed on them.
For a tube open at one end and closed at the other filled with air, the modes are such that there is always an antinode at the open end and a node at the closed end....
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Standing Electromagnetic Waves01:15

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Electromagnetic waves can be reflected; the surface of a conductor or a dielectric can act as a reflector. As electric and magnetic fields obey the superposition principle, so do electromagnetic waves. The superposition of an incident wave and a reflected electromagnetic wave produces a standing wave analogous to the standing waves created on a stretched string.
Suppose a sheet of a perfect conductor is placed in the yz-plane, and a linearly polarized electromagnetic wave traveling in the...
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Sound Waves: Resonance01:14

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Resonance is produced depending on the boundary conditions imposed on a wave. Resonance can be produced in a string under tension with symmetrical boundary conditions (i.e., has a node at each end). A node is defined as a fixed point where the string does not move. The symmetrical boundary conditions result in some frequencies resonating and producing standing waves, while other frequencies interfere destructively. Sound waves can resonate in a hollow tube, and the frequencies of the sound...
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相关实验视频

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Measurement of Scattering Nonlinearities from a Single Plasmonic Nanoparticle
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非线性静止波用于评估薄样品中的材料非线性.

Seungo Baek1, Gun Kim1, Jin-Yeon Kim2

  • 1Department of Civil, Urban, Earth, and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), UNIST-gil 50, Ulju-gun, Ulsan 44919, Republic of Korea.

Ultrasonics
|June 27, 2024
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概括

使用非线性静止波进行新的声学非线性参数 (β) 测量,可以准确地评估薄样品中的物质损伤. 这种先进的第二波生成技术克服了建筑材料以前方法的局限性.

关键词:
声学非线性参数材料表征材料的表征非线性静止波是一种非线性静止波.第二代波器的第二代波器.波浪的传播方式

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科学领域:

  • 材料科学 材料科学 材料科学
  • 非破坏性测试是指非破坏性测试.
  • 声学非线性 声学非线性

背景情况:

  • 声学非线性参数 (β) 使用第二波生成 (SHG) 量化材料非线性.
  • 目前用于测量建筑材料中的β的SHG方法受到样本大小的限制,导致边界反射阻碍了准确的评估.
  • 大型样本要求限制了SHG与其他材料表征技术的整合.

研究的目的:

  • 开发一种新的SHG方法,用于精确测量薄材料样本中的β.
  • 克服与样本大小和边界反射有关的现有SHG技术的局限性.
  • 为了使SHG与其他表征方式一起用于全面的材料分析.

主要方法:

  • 开发了一种新的SHG方法,利用非线性静止波在没有强迫的配置中.
  • 对反射波的相延迟和减弱效应进行了校正.
  • 该方法允许在薄样本中进行准确的β测量,而无厚度-波长比限制.

主要成果:

  • 拟议的SHG方法成功测量了在薄样本中的声学非线性参数 (β).
  • 由于热损伤而导致的水泥中的微观结构变化,使用测量的β.量化.
  • 该方法证明了其在受限制的样本大小中准确评估材料非线性的能力.

结论:

  • 基于非线性静止波的新型SHG方法在薄样本中提供了准确的β测量.
  • 这种技术克服了以前的局限性,使SHG能够在各种材料表征场景中应用.
  • 该方法是量化材料微观结构变化的有希望的工具,例如热损伤.