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相关概念视频

X-ray Crystallography02:18

X-ray Crystallography

23.9K
The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
23.9K
X-ray Diffraction of Biological Samples01:10

X-ray Diffraction of Biological Samples

3.8K
X-ray diffraction or XRD is an analytical tool that utilizes X-rays to study ordered structures such as crystalline organic and inorganic samples, polycrystalline materials, proteins, carbohydrates, and drugs.
According to Bragg's law, when X-rays strike the sample positioned on a stage, the rays are  scattered by the electron clouds around the sample atoms. The  X-ray diffraction or scattering is caused by constructive interference of the X-ray waves that reflect off the internal...
3.8K

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相关实验视频

Updated: Jul 6, 2025

Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
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Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating

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在二维二次扭曲 (QD) 格子上的弗劳恩霍弗衍射.

Yuewei Liu, Zhengkun Liu, François Hénault

    Optics express
    |January 5, 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二次扭曲 (QD) 网格的数学模型,使得同时多平面成像的精确设计成为可能. 这种光学创新提高了显微镜的性能和图像质量.

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    Fabrication of High Contrast Gratings for the Spectrum Splitting Dispersive Element in a Concentrated Photovoltaic System
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    Micro/Nano-scale Strain Distribution Measurement from Sampling Moir&#233; Fringes
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    Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
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    Fabrication of High Contrast Gratings for the Spectrum Splitting Dispersive Element in a Concentrated Photovoltaic System
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    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
    • 图像处理 图像处理

    背景情况:

    • 同时的多平面成像系统需要精确的光学元件,以实现平衡的能量分配和高效率.
    • 现有的衍射网格模型可能缺乏先进成像应用所需的精度.

    研究的目的:

    • 建立一个二维 (2D) 数学模型,用于二次扭曲 (QD) 格子.
    • 开发QD网格的优化设计方法,以增强同时多平面成像.
    • 根据已建立的数值方法验证分析模型.

    主要方法:

    • 弗劳恩霍弗衍射和富里埃光学原理被用来建立2D QD格子模型.
    • 对于衍射图案的数值解,采用了离散采样方法.
    • 划分算法被用来优化工作阶段的时间,以平衡能源和效率.
    • 分析结果与经典的数值模型和快速里埃变换 (FFT) 算法进行了比较.

    主要成果:

    • 分析方法使得QD网格的精确设计成为可能.
    • 优化的 QD 格设计显著提高了同时使用的多平面成像系统的光学性能.
    • 通过使用设计的 QD 格子的光学设置成功获得了初步显微镜图像.

    结论:

    • 开发的分析模型为设计QD网格提供了精确的方法.
    • QD网格提高了多平面成像系统的效率和性能.
    • 目前正在进行进一步的研究,以完善该模型以提高图像质量和更广泛的应用.