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相关概念视频

Aliasing01:18

Aliasing

119
Accurate signal sampling and reconstruction are crucial in various signal-processing applications. A time-domain signal's spectrum can be revealed using its Fourier transform. When this signal is sampled at a specific frequency, it results in multiple scaled replicas of the original spectrum in the frequency domain. The spacing of these replicas is determined by the sampling frequency.
If the sampling frequency is below the Nyquist rate, these replicas overlap, preventing the original...
119

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相关实验视频

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使用基于FPGA的高速解调算法进行光学频域反射计的实时传感方法.

Haomao Wang, Tong Zhai, Yifan Wang

    Optics express
    |November 22, 2024
    PubMed
    概括

    这项研究引入了一种基于FPGA的新型算法,用于高速光频域反射计 (OFDR) 调节,使实时结构健康监测具有更高的速度和精度.

    科学领域:

    • 光学和光子学 在光学和光子学.
    • 信号处理 信号处理
    • 材料科学 材料科学 材料科学

    背景情况:

    • 光学频域反射计 (OFDR) 对于结构健康监测至关重要.
    • 在OFDR中实时传感受到硬件限制和复杂的调节过程的阻碍.

    研究的目的:

    • 为OFDR开发一个高速解调算法.
    • 为了实现结构健康监测应用程序的实时传感能力.

    主要方法:

    • 开发了一个基于FPGA的系统,使用2D FFT和频域交叉相关算法.
    • 该系统经过实验验证,其性能规格得到验证.

    主要成果:

    • 实现了50米的传感长度和6.4毫米的空间分辨率.
    • 证明了16 μm的应变分辨率和±2000 μm的应变范围.
    • 实现了24 Hz的实时传感速率.

    结论:

    • 拟议的基于FPGA的算法显著提高了OFDR解调速度.
    • 这种新的方法可在有限的硬件资源下实现实时OFDR检测.
    • 该方法显示了结构健康监测中更广泛应用的潜力.

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