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相关概念视频

Mechanisms of Heat Transfer II01:20

Mechanisms of Heat Transfer II

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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...
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Conduction, Convection and Radiation: Problem Solving01:20

Conduction, Convection and Radiation: Problem Solving

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There are three methods by which heat transfer can take place: conduction, convection, and radiation. Each method has unique and interesting characteristics, but all three have two things in common: they transfer heat solely because of a temperature difference; and the greater the temperature difference, the faster the heat transfer.
In order to solve a problem related to heat transfer, first of all, the situation needs to be examined to determine the type of heat transfer involved. This could...
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Absorption of Radiation01:05

Absorption of Radiation

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The rate of heat transfer by emitted radiation is described by the Stefan-Boltzmann law of radiation:
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Radiation: Applications01:17

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The average temperature of Earth is the subject of much current discussion. Earth is in radiative contact with both the Sun and dark space; it receives almost all its energy from the radiation of the Sun and reflects some of it into outer space. Dark space is very cold, about 3 K, so Earth radiates energy into it. For instance, heat transfer occurs from soil and grasses, the rate of which can be so rapid that frost can occur on clear summer evenings, even in warm latitudes.
The average...
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Quantifying Heat02:46

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Thermal Energy 
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Mechanisms of Heat Transfer I01:14

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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.
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High-resolution Thermal Micro-imaging Using Europium Chelate Luminescent Coatings
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通过热发射窗口进行热成像.

Ciril Samuel Prasad1,2, Henry O Everitt2,3, Gururaj V Naik4

  • 1Applied Physics Graduate Program, Smalley-Curl Institute, Rice University, Houston, TX, USA.

Communications engineering
|November 16, 2024
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概括
此摘要是机器生成的。

研究人员开发了一种用于热窗的特殊涂层,使红外摄像头能够透过它们. 这一突破克服了热发射干扰,显著改善了热成像对比度.

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科学领域:

  • 光学和光子学 在光学和光子学.
  • 材料科学 材料科学 材料科学
  • 热成像是一种热成像技术.

背景情况:

  • 红外摄像机无法通过热窗进行成像,原因是强烈的热辐射.
  • 高温使窗户后面的物体变得模糊,限制了热成像应用.

研究的目的:

  • 通过热窗口实现红外成像.
  • 为了克服热辐射失明摄像机的挑战.

主要方法:

  • 用一个不对称地发射红外线的超表面覆盖一个热窗.
  • 设计了超表面的虚构折射指数.
  • 使用纳米级共振器来控制吸收损失.

主要成果:

  • 超表面涂层的窗户可以抑制向相机的热辐射.
  • 窗口仍然足够透明,可以进行热成像.
  • 与873 K的控制窗口相比,实现了双倍的热成像对比度.

结论:

  • 超表面涂层为通过热窗进行热成像提供了可行的解决方案.
  • 工程光学特性可以克服热发射的限制.
  • 这项技术增强了红外成像系统的功能.