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相关概念视频

Temperature and Thermal Equilibrium01:11

Temperature and Thermal Equilibrium

Heat and temperature are essential concepts for everyone every day. The study of heat and temperature is part of an area of physics known as thermodynamics. It is not always easy to distinguish heat and temperature.
The concept of temperature has evolved from the common concepts of hot and cold. The scientific definition of temperature explains more than just our sense of hot and cold. Temperature is operationally defined as the quantity measured with a thermometer. Furthermore, temperature is...
Mechanisms of Heat Transfer I01:14

Mechanisms of Heat Transfer I

Just as interesting as the effects of heat transfer on a system are the methods by which the heat transfer occur. Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, such as through a cooking pan, or slowly, such as through the walls of a picnic ice box. So many processes involve heat transfer that it is hard to imagine a situation where no heat transfer occurs. Yet, every heat transfer takes place by only three methods: conduction, convection, and radiation.
Mechanisms of Heat Transfer II01:20

Mechanisms of Heat Transfer II

In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...
Resistance01:19

Resistance

When a current moves through any conductor, the conductor causes some level of difficulty for the current to flow. The measure of that difficulty is known as the resistance of the material and is represented by R. Every material has its own resistance. In the case of conductors, heat is emitted whenever a current passes through them. Resistance depends on the resistivity of the material. Resistivity is a characteristic of the material used to fabricate electrical components, whereas the...
Thermal expansion and Thermal stress: Problem Solving01:27

Thermal expansion and Thermal stress: Problem Solving

San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
To solve the problem, first, identify the known and unknown quantities. The initial length (L) of the bridge is 1275 m, the coefficient of linear expansion (α) for steel is 12 x 10-6/°C, and the change in temperature (ΔT) is 55 °C.
Thermal Strain01:19

Thermal Strain

Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...

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相关实验视频

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Quantitative Visualization and Detection of Skin Cancer Using Dynamic Thermal Imaging
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Quantitative Visualization and Detection of Skin Cancer Using Dynamic Thermal Imaging

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一种用于非破坏性测试的新型阶段阵列温度学概念.

Cristiano Martinelli1, Michele Meo2

  • 1Department of Aeronautics and Astronautics, University of Southampton, Southampton, SO16 7QF, UK.

Scientific reports
|November 7, 2025
PubMed
概括

这项研究介绍了分相阵列热谱 (PAT),一种使用引导热波进行增强的非破坏性测试的新方法. 与传统的红外热像 (IRT) 相比,PAT可以更好地识别材料中的缺陷.

科学领域:

  • 材料科学与工程 材料科学与工程
  • 非破坏性测试 (NDT) 是一种非破坏性测试.
  • 热力工程是热力工程中的一个.

背景情况:

  • 阶段阵列技术传统上用于精确应用的弹性,电磁和其他波.
  • 主动红外热学 (IRT) 方法通常缺乏对热梯度方向的控制,限制了缺陷识别.
  • 现有的IRT技术均地加热表面,阻碍了热反应的定向分析.

研究的目的:

  • 提出和验证一种用于非破坏性评估的新型分相阵列热像 (PAT) 方法.
  • 通过实现热波的精确方向和聚焦,克服传统IRT的局限性.
  • 引入一种新的三维方法,以加强材料检查和缺陷表征.

主要方法:

  • 开发了一种用于指导和聚焦热波的新型分相阵列方法,称为分相阵列温度学 (PAT).
  • 根据数值模拟推导和验证了用于热波传播的封闭形式分析解决方案.
  • 使用热有限元素 (FE) 模拟和对和复合材料板进行实验分析来评估PAT准确性.

主要成果:

  • 与脉冲温度学 (PT) 相比,分相阵列温度学 (PAT) 证明了对热波前线的优越控制.
  • FE模拟和实验结果验证了PAT在识别平底孔和撞击损伤等缺陷方面的有效性.
关键词:
航空航天工程是航空航天工程.缺陷识别 缺陷识别非破坏性测试是指非破坏性测试.热图学 热图学 热图学 热图学

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  • 该方法成功地实现了热波的精确方向和聚焦,提供了增强的定向热梯度控制.

    • 结论:

    • 阶段式阵列热学 (PAT) 通过引入受控的热波面方向控制,在非破坏性评估方面取得了重大进展.
    • 这种新的方法在结构健康监测和自适应制造系统方面具有变革性的潜力.
    • PAT克服了传统IRT的关键局限性,使材料检查更加精确和有效.