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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

272
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.
272

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相关实验视频

Updated: Sep 11, 2025

Direct Force Measurements of Subcellular Mechanics in Confinement using Optical Tweezers
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光学折射逆弱值倾斜计的光学折射逆弱值倾斜计.

Garrett K Josemans, Benjamin A Baldwin, John E Gray

    Applied optics
    |August 12, 2025
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    概括
    此摘要是机器生成的。

    这项研究增强了光学弱值放大 (WVA) 模型,证明了其作为敏感的倾斜计的使用. 实验室测量证实了高倾斜灵敏度和信号噪声比率的增加.

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    相关实验视频

    Last Updated: Sep 11, 2025

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    科学领域:

    • 光学和光子学 在光学和光子学.
    • 量子测量是一种量子测量.

    背景情况:

    • 1989年引入的光学弱值放大 (WVA) 技术为提高测量灵敏度提供了潜力.
    • 了解WVA设备中的指针行为对于优化其性能至关重要.

    研究的目的:

    • 介绍光学WVA设备的扩展数学模型.
    • 为了研究撞击角度对WVA区域内的指针行为的影响.
    • 为了证明基于双折的WVA装置作为敏感的倾斜计的新型应用.

    主要方法:

    • 为光学WVA设备开发了一个扩展的数学模型.
    • 模拟指针行为关于双断晶体的冲击角度.
    • 进行实验室测量以验证模型并评估倾斜计的性能.

    主要成果:

    • 实现了大约0.58m/rad. 的倾斜灵敏度.
    • 与非放大折射相比,显示了390倍的放大因子.
    • 观察到信号与噪声比率 (SNR) 的增加大约是射击噪声的110倍.

    结论:

    • 扩展的数学模型准确地描述了WVA设备的行为.
    • 基于双断层的WVA设备可以有效地作为高度灵敏的倾斜计.
    • 该研究验证了WVA在精度测量中的实际应用.