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相关概念视频

Electronic Distance Measuring Instruments01:30

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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 short...
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Tapes are essential in surveying for accurate, durable, and short-distance measurements. Made from lightweight, nylon-coated steel, they offer flexibility and strength for rugged outdoor use. The nylon coating protects against rust and wear, extending the tape's life. Standard lengths, around 30 meters, are marked in meters and millimeters for precision.Surveyors select tapes based on site conditions and accuracy needs. Lightweight, nylon-coated tapes are commonly used for ease of handling and...
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Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other...
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长距离的高空间分辨率分布式Brillouin传感被关联域编码启用.

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    此摘要是机器生成的。

    一种新的混合无周期编码的Brillouin光学对应域分析 (HA编码的BOCDA) 纤维传感器使远程,高分辨率分布式传感成为可能. 这一突破抑制了有害影响,实现了72.65公里的射程,分辨率为5厘米.

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    科学领域:

    • 光电学和光子学的光学电子和光子学.
    • 光纤传感技术是指光纤传感技术.
    • 分布式测量系统 分布式测量系统

    背景情况:

    • 布里卢恩光学相关域分析 (BOCDA) 是分布式光纤传感的一个关键技术.
    • 现有的BOCDA系统在传感范围和空间分辨率方面面临限制,原因是刺激布里卢恩散射 (SBS) 等有害影响.
    • 在BOCDA中脉冲编码方法可以引入寄生效应,阻碍性能.

    研究的目的:

    • 提出并验证混合无周期编码BOCDA (HA编码BOCDA) 纤维传感器.
    • 为了实现远程和高空间分辨率的分布式测量.
    • 为了抑制脉冲编码诱导的SBS过程中的有害影响,以提高BOCDA性能.

    主要方法:

    • 为BOCDA开发混合无周期编码方案.
    • 利用由高速相调节产生的特殊能量转换模式.
    • 在脉冲编码诱导的级联SBS过程中抑制寄生效应.

    主要成果:

    • 展示了72.65公里的传感范围.
    • 实现5厘米的空间分辨率.
    • 达到温度和应变测量准确度分别为2°C和40μC.
    • 实现低系统复杂性和增强的测量速度.

    结论:

    • 拟议的HA编码BOCDA传感器有效地克服了传统BOCDA系统的局限性.
    • 这种新的方法能够实现前所未有的远程和高空间分辨率分布式传感.
    • 这项技术为需要精确光纤传感的各种应用提供了有前途的解决方案.