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相关概念视频

Discrete Fourier Transform01:15

Discrete Fourier Transform

322
The Discrete Fourier Transform (DFT) is a fundamental tool in signal processing, extending the discrete-time Fourier transform by evaluating discrete signals at uniformly spaced frequency intervals. This transformation converts a finite sequence of time-domain samples into frequency components, each representing complex sinusoids ordered by frequency. The DFT translates these sequences into the frequency domain, effectively indicating the magnitude and phase of each frequency component present...
322

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相关实验视频

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High-resolution, High-speed, Three-dimensional Video Imaging with Digital Fringe Projection Techniques
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使用时间扩展的动态曲率传感 ΦOTDR

Camilo Escobar-Vera, Miguel Soriano-Amat, Hugo F Martins

    Optics letters
    |August 15, 2023
    PubMed
    概括

    一种新的时间扩展相位敏感光学时域反射计 (TE-ΦOTDR) 技术使分布式形状传感能够达到125米. 这种先进的光纤传感器系统为动态应用提供了高分辨率和采样速率.

    科学领域:

    • 物理 物理学 物理
    • 工程 工程师 工程师 工程师
    • 材料科学 材料科学 材料科学

    背景情况:

    • 光纤传感器对于形状感知至关重要,采用纤维布拉格格,OFDR和OTDR等方法.
    • 现有的技术在完全分布,动态传感性能或有效纤维长度方面存在局限性.

    研究的目的:

    • 引入一种使用多核纤维 (MCF) 的新型分布式曲率传感系统.
    • 为了解决当前光纤形状传感技术的性能差距.

    主要方法:

    • 使用一个多核光纤 (MCF) 采用三个被审讯的核心.
    • 实施了一种新的时间扩展相位敏感光学时间域反射计 (TE-ΦOTDR) 技术用于审讯.
    • 在125米范围内实现分布式曲率传感.

    主要成果:

    • 展示了125米的传感范围,分辨率为10厘米.
    • 实现了50 Hz的高采样率,以实现动态传感能力.
    • 成功填补了分布式纤维形状传感中的关键性能差距.

    结论:

    • 开发的TE-ΦOTDR系统在分布式形状传感方面取得了重大进展.

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  • 该系统的功能为土木工程,医学和地震学的应用开辟了新的可能性.
  • 这项技术提高了光纤传感器的性能,用于复杂的形状和曲率测量.