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相关概念视频

Influence of Earth's Curvature and Atmospheric Refraction on Leveling01:26

Influence of Earth's Curvature and Atmospheric Refraction on Leveling

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During leveling, the Earth's curvature and atmospheric refraction introduce deviations in the line of sight from a true horizontal reference. When the line of sight is leveled, it remains perpendicular to the plumb line only at a single point. Beyond this, it deviates due to the Earth’s curvature, represented by the correction C. For a sight distance D, the deviation can be derived using the relationship:This relationship shows that the deviation increases quadratically with distance.
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Atomic Force Microscopy01:08

Atomic Force Microscopy

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Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
The AFM Probe
The probe is regarded as the heart of any AFM setup and comprises the...
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相关实验视频

Updated: May 30, 2025

Atomic Force Microscopy Cantilever-Based Nanoindentation: Mechanical Property Measurements at the Nanoscale in Air and Fluid
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虚拟参考表面相位测量偏向计,用于高精度的自由形表面测量.

Nansheng Zhang, Shanshan Wang, Shaohui Zhang

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    此摘要是机器生成的。

    一种新的虚拟参考表面相位测量偏移计 (VRPMD) 方法克服了复杂的自由形表面的传统相位测量偏移计 (PMD) 的局限性. 这种技术可以高精度测量具有很大的曲率的具有挑战性的镜面.

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    科学领域:

    • 光学计量学 在光学计量学
    • 表面计量学 表面计量学
    • 自由形式的光学.

    背景情况:

    • 传统的相位测量偏向计 (PMD) 与镜面表现出很大的局部曲率而斗争.
    • 限制包括显著的集成错误和过度密集的边缘,阻碍了复杂的自由形式表面检查.
    • 现有的方法限制了PMD在高精度制造和自由形光学质量控制中的应用.

    研究的目的:

    • 引入和验证一种新的虚拟参考表面相位测量偏向计 (VRPMD) 方法.
    • 为了解决传统PMD测量具有较大的局部曲率的复杂自由形表面的局限性.
    • 通过理论,模拟和实验分析来证明VRPMD与传统PMD的优势.

    主要方法:

    • 基于斜率差异测量原理的VRPMD的开发.
    • 理论建模和模拟分析以评估VRPMD性能.
    • 实验验证,包括拟议的一种表面自我引用技术,用于对齐.
    • 使用干扰计和形状计进行比较测量.

    主要成果:

    • VRPMD有效地克服了与大曲率表面相关的集成错误和边缘密度问题.
    • 拟议的表面自引用技术成功地解决了非旋转对称的自由形表面的对齐挑战.
    • 实验结果证实VRPMD能够高精度测量复杂的自由形表面.
    • 对比研究表明VRPMD的性能与干扰测量和造型测量相当或优于干扰测量和造型测量.

    结论:

    • VRPMD是一种非常有前途的技术,用于对复杂的自由形表面进行高精度检查.
    • 该方法在具有挑战性的光学组件中比传统的PMD提供了显著的优势.
    • VRPMD 增强了用于先进光学制造和质量保证的计量能力.