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基于UWFBG阵列的直接检测 Φ-OTDR 使用线性相调制的双脉冲.

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    我们开发了一种新的相位敏感光学时域反射计 (Φ-OTDR) 系统,使用超弱纤维布拉格格进行敏感的分布式振动测量. 这种新的方法提高了光纤传感的稳定性和准确性.

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    科学领域:

    • 光电学是指光电子产品.
    • 光纤传感传感器是指光纤传感器.
    • 光子学 是一个光子学.

    背景情况:

    • 分布式振动传感对于基础设施监控至关重要.
    • 现有的相位敏感OTDR (Φ-OTDR) 系统面临着稳定性和噪声方面的挑战.
    • 超弱纤维布拉格格 (UWFBGs) 提供了增强传感能力的潜力.

    研究的目的:

    • 提出和演示一种新的直接检测相位敏感OTDR (Φ-OTDR) 系统.
    • 为了实现高度灵敏和稳定的分布式振动测量.
    • 克服 Φ-OTDR 中现有的相调和近似方法的局限性.

    主要方法:

    • 使用超薄纤维布拉格格 (UWFBG) 阵列进行传感.
    • 采用双脉冲生成和线性相调节技术.
    • 实施N步相位移解调算法用于定量相位变化分析.
    • 引入相位移近似方法以延长传感长度并提高精度.

    主要成果:

    • 在1公里的UWFBG阵列上进行实验验证,反射率为-40 dB至-45 dB.
    • 量化测量不同幅度和良好的线性振动.
    • 显著抑制低频自我噪声,达到-54.3dB rad2/Hz的整体自我噪声.
    • 在分布式振动测量中表现出极高的灵敏度和显著的稳定性.

    结论:

    • 拟议的基于UWFBG的 Φ-OTDR 系统为分布式振动传感提供了一种新且有效的解决方案.
    • N-步相位移解调和相位移近似方法显著提高了精度,克服了传统的局限性.
    • 该系统具有高灵敏度,稳定性和定量测量能力,适合各种监控应用.