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相关概念视频

Plane Electromagnetic Waves II01:29

Plane Electromagnetic Waves II

3.0K
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.
3.0K
Electromagnetic Wave Equation01:24

Electromagnetic Wave Equation

1.1K
Maxwell's equations for electromagnetic fields are related to source charges, either static or moving. These fields act on a test charge, whose trajectory can thus be determined using suitable boundary conditions. The objective of electromagnetism is thus theoretically complete.
However, although electric and magnetic fields were first introduced as mathematical constructs to simplify the description of mutual forces between charges, a natural question emerges from Maxwell's equations:...
1.1K
Plane Electromagnetic Waves I01:30

Plane Electromagnetic Waves I

3.6K
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.
The EM field is assumed...
3.6K
Propagation Speed of Electromagnetic Waves01:30

Propagation Speed of Electromagnetic Waves

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Electromagnetic waves are consistent with Ampere's law. Assuming there is no conduction current Ampere's law is given as:
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Three-Dimensional Force System01:30

Three-Dimensional Force System

2.0K
In mechanical engineering, a three-dimensional force system is a system of forces acting in three dimensions, with forces applied along the x, y, and z coordinate axes. The three-dimensional force system is an important concept in mechanical engineering, as it allows engineers to understand and analyze the behavior of objects and structures in three dimensions. By understanding the forces acting on a system, engineers can design more efficient and effective mechanical systems that can withstand...
2.0K
Propagation of Waves01:07

Propagation of Waves

2.3K
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.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
2.3K

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相关实验视频

Updated: Jun 24, 2025

Determining 3D Flow Fields via Multi-camera Light Field Imaging
14:25

Determining 3D Flow Fields via Multi-camera Light Field Imaging

Published on: March 6, 2013

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聚焦场中的非线性射线跟踪,第1部分. 3D聚焦波场的计算:教程

Qin Yu, Bryan M Hennelly

    Journal of the Optical Society of America. A, Optics, image science, and vision
    |June 10, 2024
    PubMed
    概括

    本文介绍了使用角光谱法计算3D复杂波场的高速计算的两个算法. 这些方法对于非线性射线跟踪和理解聚焦激光束至关重要.

    科学领域:

    • 光学和光子学 在光学和光子学.
    • 计算物理 计算物理

    背景情况:

    • 精确计算三维 (3D) 复杂波场对于先进的光学模拟至关重要.
    • 角光谱法为计算衍射场提供了一种高效准确的方法.

    研究的目的:

    • 为提供关于3D复杂波场高速计算的教程.
    • 开发使用角光谱方法生成聚焦波场的算法.
    • 为非线性射线追踪方法奠定基础.

    主要方法:

    • 利用角光谱法进行波场传播.
    • 开发了两个算法:一个基于薄镜头近似,另一个使用理想镜头模型 (光学里叶变换).
    • 对聚焦激光束 (TEM00和TEM01) 的计算和内存效率进行了分析.

    主要成果:

    • 介绍了两种不同的算法,用于在焦点区域生成3D复杂波场.
    • 详细说明了对焦领域的三维采样要求.
    • 提供了开发算法的计算和内存效率的表达式.

    结论:

    • 开发的算法有效计算3D复杂波场,作为流量跟踪的前身.
    • 这部作品提供了一个实用的教程,用于计算三维的重点字段.

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  • 这些方法是后续关于非线性射线跟踪和透镜偏差的论文的基础.