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Plane Electromagnetic Waves I01:30

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The existence of combined electric and magnetic fields that propagate through space as electromagnetic (EM) waves is the most significant prediction of Maxwell's equations. As Maxwell's equations hold in free space, the predicted electromagnetic waves do not require a medium for their propagation. An EM wave comprises an electric field, defined as the force per charge on a stationary charge, and a magnetic field, which is the force per charge on a moving charge.
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Velocity and Acceleration of a Wave00:51

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A wave propagates through a medium with a constant speed, known as a wave velocity. It is different from the speed of the particles of the medium, which is not constant. In addition, the velocity of the medium is perpendicular to the velocity of the wave. The variable speed of the particles of the medium implies that there must be acceleration associated with it. 
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Kirchoff's Laws using Phasors01:12

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Analyzing AC circuits in electrical systems is a fundamental aspect of electrical engineering. In these circuits, AC power is supplied from a distribution panel and wired to various household appliances in parallel. To perform a comprehensive analysis, electrical engineers use Kirchhoff's voltage and current laws, which are equally applicable in AC circuits as in DC circuits.
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Plane Electromagnetic Waves II01:29

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Consider a plane wavefront traveling in position x-direction with a constant speed. This wavefront can be utilized to obtain the relationship between electric and magnetic fields with the help of Faraday's law.
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Traveling Waves: Lossless Lines01:27

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The provided content explores the behavior of traveling waves on single-phase lossless transmission lines. It begins with a single-phase two-wire lossless transmission line of length Δx, characterized by a loop inductance LH/m and a line-to-line capacitance C F/m. These parameters result in a series inductance LΔx  and a shunt capacitance CΔx.
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Propagation of Waves01:07

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When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
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Cortical Bone Assessment Using Ultrasonic Guided Waves: A Reproducibility Study in a Healthy Population
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用相位阵列方法生成引导波并使用V(z) 方法提取相位速度.

Michaël Lematre1, Marc Lethiecq1

  • 1GREMAN Laboratory, CNRS - UMR 7347, Université de Tours / INSA CVL, Blois, France.

Ultrasonics
|May 16, 2025
PubMed
概括

阶段阵列传感器可以有效地替代单元传感器的V (z) 方法,使准确的引导波速测量材料的特征. 仔细的参数选择确保了异型基质的稳定V(z) 曲线.

科学领域:

  • 材料科学 材料科学 材料科学
  • 声学 声学 在声学方面
  • 非破坏性测试 不破坏性测试

背景情况:

  • 对于从引导波速来确定材料弹性常数而言,V(z) 方法至关重要.
  • 经典的单元传感器限制了V (z) 方法的灵活性和适用性.
  • 阶段阵列传感器在产生和检测声波方面具有潜在的优势.

研究的目的:

  • 通过V (z) 方法研究使用相位阵列传感器的可行性.
  • 分析在V (z) 测量中使用阶段阵列传感器的好处和必要的预防措施.
  • 探索阶段阵列参数对引导波生成和检测的影响.

主要方法:

  • 开发一个模型,用于V(z) 声学特征,使用阶段阵列传感器.
  • 对于聚焦的声场产生,应用延迟定律.
  • 在异型基板上分析分相阵列参数 (元素数,焦距,频率).

主要成果:

  • 通过相位阵列传感器成功生成和检测V(z) 曲线,类似于聚焦传感器.
  • 阐述了阶段阵列参数对各种声波 (SAW,PSAW,SSQW) 的生成和检测的影响.
  • 用阶段阵列传感器验证了V(z) 方法,用于表征异性质材料.
关键词:
有导向模式的模式.阶段阵列传感器的变频器.基板是一种基板.V (z) 声学特征的签名

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结论:

  • 阶段阵列传感器是单元传感器的可行替代品,用于V (z) 方法.
  • 优化阶段阵列参数和频率对于稳定和准确的V (z) 测量至关重要.
  • 这种方法提高了在异型材料中从引导波速推断弹性常数的能力.