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相关概念视频

Discrete-Time Fourier Series01:20

Discrete-Time Fourier Series

The Discrete-Time Fourier Series (DTFS) is a fundamental concept in signal processing, serving as the discrete-time counterpart to the continuous-time Fourier series. It allows for the representation and analysis of discrete-time periodic signals in terms of their frequency components. Unlike its continuous counterpart, which utilizes integrals, the calculation of DTFS expansion coefficients involves summations due to the discrete nature of the signal.
For a discrete-time periodic signal x[n]...

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相关实验视频

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Controllable Nucleation of Cavitation from Plasmonic Gold Nanoparticles for Enhancing High Intensity Focused Ultrasound Applications
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使用离散频率可引导声传感器进行定向多频引导波通信.

Masoud Mohammadgholiha, Federica Zonzini, Jochen Moll

    IEEE transactions on ultrasonics, ferroelectrics, and frequency control
    |August 14, 2023
    PubMed
    概括

    一个新的定向传感器使用引导波来监测结构健康状况和声学通信. 这种频率可转向的设备克服了传统方法的局限性,使在具有挑战性的环境中可靠的数据传输成为可能.

    科学领域:

    • 材料科学 材料科学 材料科学
    • 声学 声学 在声学上
    • 信号处理 信号处理

    背景情况:

    • 引导波 (GWs) 提供了替代的通信道,但面临着分散和多路干扰等挑战.
    • 传统的有线或射频 (RF) 方法在恶劣或难以进入的环境中存在局限性.
    • 频率可引导声传感器 (FSAT) 可以通过固有的定向能力减轻GW传播问题.

    研究的目的:

    • 引入基于GWs的新型定向传感器,用于结构健康监测 (SHM) 和声学数据通信.
    • 通过使用频率依赖的空间过来证明传感器克服GW传播挑战的能力.
    • 通过模拟和实验测试验证传感器的性能.

    主要方法:

    • 设计了一个传感器,能够通过使用不同的频道 (50450 kHz) 在三个方向上激活/感应A0羊羔波.
    • 使用有限元 (FE) 模拟和实验测试,使用扫描激光多普勒振动计 (SLDV) 进行性能验证.
    • 集成的频率转向与ON-OFF键调制 (OOK) 为基于硬件的频率定向和经过测试的多进多出 (MIMO) 功能.

    主要成果:

    • 传感器表现出有效的频率转向能力,将信号频率与传播方向关联起来.
    • FE模拟和SLDV实验证实了传感器的性能和方向控制.

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  • 在板上的MIMO测试显示,实验结果和FE模拟之间有很好的一致性.

    • 结论:

    • 这种新型的定向传感器有效地解决了SHM和声学通信的GW传播挑战.
    • 频率转向机制为基于弹性波的系统提供了强大的方向控制方法.
    • 这项技术对复杂环境中的先进通信和监控充满了希望,类似于5G研究.