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相关概念视频

Histogram01:05

Histogram

13.9K
The histogram is a graphical representation in the x-y form of data distribution in a data set. The horizontal x-axis is labeled with what the data represents (for instance, distance from your home to school). The vertical y-axis is labeled either frequency or relative frequency (or percent frequency or probability).
A histogram graph consists of contiguous (adjoining) boxes. The heights of the bars correspond to frequency values. The graph will have the same shape with respective labels. The...
13.9K
Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

8.2K
Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
8.2K
¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

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A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
1.3K
Relative Frequency Histogram01:14

Relative Frequency Histogram

5.5K
The relative frequency depicts the proportion of data points that have each value. The frequency tells the number of data points that have each value. Like the histogram, a relative frequency histogram also has the same shape with a horizontal scale (the x-axis), but the vertical scale (the y-axis) is marked with relative frequencies (percentages of the whole) instead of actual frequencies. A relative frequency histogram is a graphical representation of a frequency distribution where the...
5.5K
Mohr's Circle for Plane Strain01:18

Mohr's Circle for Plane Strain

558
Mohr's circle is a crucial graphical method used to analyze plane strain by plotting strain on a set of cartesian coordinates, where the abscissa is normal strain ∈ and the ordinate is shear strain γ. Similarly to Mohr’s circle for plane stress, two points X and Y are plotted. Their coordinates are (∈x, -γXY) and (∈Y, γXY), respectively.
Mohr's circle visually represents the strain states under various conditions, which is essential for...
558

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相关实验视频

Updated: Jul 16, 2025

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

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斯特雷尔比率作为一个相位组图.

Benjamin D Strycker

    Applied optics
    |September 14, 2023
    PubMed
    概括

    斯特雷尔比率是光学系统性能的衡量指标,可以使用一个按apodization权重的相位直方图来计算. 这项研究详细介绍了一种新的数值方法,用于精确计算,增强光学分析.

    科学领域:

    • 光学工程的光学工程.
    • 图像分析 图像分析
    • 数学物理学的数学物理.

    背景情况:

    • 斯特雷尔比率是评估光学系统性能的一个关键指标.
    • 现有的计算斯特雷尔比率的方法可能是计算密集型或缺乏精度.
    • 了解相分布和斯特雷尔比率之间的关系对于光学设计至关重要.

    研究的目的:

    • 为了证明斯特雷尔比率可以普遍表达为对一个apodization-weighted相组图的积分.
    • 引入和验证一个实用的数值方法来有效计算这些直方图.
    • 探索Strehl比率可以分解成两个因子的乘积的条件.

    主要方法:

    • 使用费德勒的共同面积公式来建立apodization加权相组图的数学形式主义.
    • 开发和实施一种新的数值算法来计算这些直方图.
    • 将新数值方法的性能与现有技术进行比较.

    主要成果:

    • 斯特雷尔比率始终被表示为apodization-weighted阶段信息的整体.
    • 一种新的数值方法提供了准确和快速的apodization-weighted阶段直方图的计算.
    • 该研究确定了将斯特雷尔比率表达为S = S1 * S2.2的乘积的具体条件.

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    Chemical Synthesis of Porous Barium Titanate Thin Film and Thermal Stabilization of Ferroelectric Phase by Porosity-Induced Strain

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    结论:

    • 按apodization加权的相位直方图为理解斯特雷尔比率提供了一个统一的框架.
    • 开发的数值方法显著提高了斯特雷尔比率计算的效率和准确性.
    • 对于先进的光学系统分析,需要对斯特雷尔比率的乘法分解进行进一步的研究.