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相关概念视频

Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

465
Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over...
465

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相关实验视频

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A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings
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270公里单跨分布式光纤振动传感器,没有光学放大.

George Y Chen, Shangwei Dai, Xing Rao

    Optics express
    |September 23, 2025
    PubMed
    概括

    一种新的声光频率转移向前传输分布式振动传感器 (AFS-FTDVS) 克服了传统系统的距离限制. 这项技术使铁路轨道和自然灾害的精确远距离监控成为可能,即使在海底环境中也是如此.

    科学领域:

    • 光纤传感传感器是指光纤传感器.
    • 分布式振动传感器 分布式振动传感器
    • 自然危害监测,自然危害监测

    背景情况:

    • 传统的分布式声学传感器 (DAS) 在传感距离和信号噪声比方面面临限制,原因是信号背散.
    • 现有的远程系统受到反向散射噪声的限制,这阻碍了对广泛的基础设施和自然现象的有效监测.

    研究的目的:

    • 提出和演示一个声光频率转移向前传输分布式振动传感器 (AFS-FTDVS),用于增强远距离监控.
    • 克服传统分布式传感系统中雷利反射和连贯噪声的局限性.

    主要方法:

    • 开发一个AFS-FTDVS系统,利用前向传输与声光频率转移来分离后向散射和前向信号.
    • 在272公里的单模光纤上进行实验验证,用于振动传感和定位.
    • 对180公里的海底光缆进行拉伸测试,以模拟海底事件监测.

    主要成果:

    • 在272公里的光纤上实现了35.6米的定位精度.
    • 成功测量并定位了沿着180公里海底电缆的低频 (0.15赫兹) 拉伸事件.
    • 证明了系统在没有光学放大的情况下进行长距离振动传感的能力.

    结论:

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    • AFS-FTDVS的设计有效地隔离了反向散射噪声,使得远距离振动传感器能够精确地传感.
    • 这项技术为监控铁路轨道和自然灾害等关键基础设施提供了强大的解决方案,包括在跨海灾害观察网络中的潜在应用.