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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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A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
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高精度纤维布拉格格子倾斜计

Yujia Cao, Xi Wu, Yuntian Teng

    Applied optics
    |June 10, 2024
    PubMed
    概括

    一种新的光纤倾斜计克服了电磁传感器的局限性,用于精确的斜率变形监测. 这种新的传感器在恶劣环境中提供了高精度和稳定性,改善了结构安全评估.

    科学领域:

    • 地质技术工程 地质技术工程
    • 传感器技术 传感器技术
    • 光纤传感传感器是指光纤传感器.

    背景情况:

    • 倾斜监测对于坡度稳定,桥梁完整性和地震活动检测至关重要.
    • 电磁倾斜计在恶劣环境,可扩展性和信号可靠性方面存在挑战.
    • 现有技术需要进行强大而准确的变形监测.

    研究的目的:

    • 开发和验证一种新的光纤倾斜计.
    • 为了解决电磁传感器在变形监测应用中的局限性.
    • 为了提高斜坡监测的准确性,灵敏性和长期稳定性.

    主要方法:

    • 设计了一种光纤传感器,利用基于管原理的悬浮传感.
    • 嵌入式轴承可最大限度地减少机械摩擦,提高传感器性能.
    • 通过模拟优化结构参数,然后进行传感器制造和实验测试.

    主要成果:

    • 光纤倾斜计的灵敏度为305.2分钟/°,在±9°的测量范围内.
    • 实现了大约3.3×10−4°的分辨率,精度为2%,可重复性误差为1.9%.
    • 具有良好的爬行阻力和长期测量稳定性.

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    结论:

    • 拟议的光纤倾斜计有效地满足了准确的斜率变形监测的要求.
    • 传感器的设计克服了电磁倾斜计的环境和网络限制.
    • 这项技术为关键基础设施和地质危险评估提供了有前途的解决方案.