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相关概念视频

Phase Contrast and Differential Interference Contrast Microscopy01:26

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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...
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Total internal reflection fluorescence microscopy or TIRF is an advanced microscopic technique used to visualize fluorophores in samples close to a solid surface with a higher refractive index, such as a glass coverslip. TIRF only allows fluorophores in proximity to the solid surface to be excited. When light from a medium with a lower refractive index (such as air) hits the glass coverslip at a critical angle, the light undergoes total internal reflection stead of passing through the glass.
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相关实验视频

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Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating
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镜像反射的可视化与相连贯成像使用子孔径使用子孔径.

Tony Rasolonirina1, Guillaume Painchaud-April2, Alain Le Duff2

  • 1PULETS, École de technologie supérieure (ÉTS), Montréal, QC H3C 1K3, Canada.

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|June 20, 2025
PubMed
概括

阶段连贯成像 (PCI) 努力检测镜像反射器. 本研究介绍了一种选择PCI特定子孔径 (SA) 的方法,提高了超声波测试中镜像反射的检测.

科学领域:

  • 非破坏性测试是指非破坏性测试.
  • 超声波成像 超声波成像
  • 信号处理 信号处理

背景情况:

  • 阶段阵列超声波测试 (PAUT) 越来越多地被基于全矩阵捕获 (FMC) 的方法取代,例如总聚焦方法 (TFM).
  • 阶段一致性成像 (PCI) 提供了更简单,更负担得起的仪器的潜力,仅使用信号相位,但与光镜反射器检测相扎.
  • 在没有振幅的PCI中错过了光镜反射器,因为它们的信息是由特定的子光圈 (SA) 捕获的,与衍射散射器不同.

研究的目的:

  • 分析光谱波路径,以预测和选择适当的发射和接收子光圈 (SA),敏感于PCI中的光谱反射.
  • 证明拟议的SA选择方法在超声波图像中揭示镜像信息的有效性.
  • 评估PCI作为独立或补充解决方案的非破坏性评估能力.

主要方法:

  • 对光谱波路径的分析,以确定适合在PCI中发射和接收的子光圈 (SA).
  • 用提议的SA选择生成的PCI图像与传统方法对口和侧钻孔 (SDH) 的比较.
  • 将该方法应用于现实的疲劳裂场景,以评估其在复杂环境中的性能.

主要成果:

  • 拟议的方法通过选择适当的SAS,成功地揭示了镜像信息,提高了像隙和SDHs这样的特征的检测.
  • 虽然标准的PCI突出显示了分散的反射,但在PCI中,SA选择主要显示了镜面反射.
关键词:
阶段一致性成像 (PCI) 技术镜子上的反射是镜子反射.副孔径 (SA) 是指一个小孔径.总聚焦方法 (TFM) 是一种全聚焦方法.矢量的一致性因子 (VCF)

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  • 在SA选择过程中减少光圈大小可能会降低图像质量,但该方法对于专用PCI仪器是有价值的.

    • 结论:

    • 拟议的子孔径选择方法有效地解决了相连贯成像中镜面反射器检测的局限性.
    • 通过这种SA选择技术增强的PCI可以作为一种强大的独立或补充的非破坏性测试方法.
    • 矢量连贯因子 (VCF) 成像,可以通过二进制获取实现,为简化仪器提供了替代方案,产生类似TFM的图像.