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相关概念视频

Interference: Path Lengths01:10

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Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
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Operational amplifiers (op-amps) are versatile electronic components that can be interconnected in a cascade - one after another in a linear sequence. This cascading is possible due to their infinite input resistance and zero output resistance, allowing them to maintain their input-output relationships even when connected in series.
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Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...
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The operational amplifier, commonly known as an op-amp, is a specially designed electronic circuit component. Its purpose is to work in conjunction with other circuit elements to execute a defined signal-processing operation. Consider an equivalent circuit model of an op-amp, as depicted in Figure 1; the output section comprises a voltage-controlled source in parallel with the output resistance Ro.
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In the AX proton spin system, proton A can sense the two spin states of a coupled proton X, resulting in a doublet NMR signal with two peaks of equal (1:1) intensity. When proton A is coupled to two equivalent protons (AX2 spin system), the spin states of each X can be aligned with or against the external field, creating three possible scenarios. This results in a 1:2:1  triplet signal, where the central peak corresponds to the chemical shift of A and is twice as large or intense as the...
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多个参数数组中的声学发射器之间的非线性相互作用特征.

Haokang Shi1,2,3, Desen Yang1,2,3, Jie Shi1,2,3

  • 1National Key Laboratory of Underwater Acoustic Technology, Harbin Engineering University, Harbin 150001, China.

The Journal of the Acoustical Society of America
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概括

多重参数阵列 (MPA) 使用非线性声学发射器相互作用进行光束形成. 这项研究阐明了这些机制,使得对声波束和波束产生有了更好的控制.

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科学领域:

  • 声学 声学 在声学方面
  • 非线性声学 非线性声学
  • 阵列信号处理 阵列信号处理

背景情况:

  • 声学发射器之间的非线性相互作用对于多个参数数组 (MPA) 声场形成至关重要.
  • 这种非线性相互作用的特征及其在光束形成中的作用尚未得到充分研究.

研究的目的:

  • 通过阐明对非线性合强度的机制和参数影响来研究MPA的声波束形成.
  • 分析传输阵列收益 (TAG) 并探索生成高度定向和束.

主要方法:

  • 在近轴近似下利用可引导的高斯波束扩展来研究MPA声波束.
  • 导出TAG作为线性和合术语的叠加.
  • 分析了相差和阵列元素对光束特征的影响.

主要成果:

  • 阐明的机制和参数影响不同声学发射器之间的非线性合强度的规律.
  • 证明控制相位差 (±π/2) 可以实现比传统相位阵列更窄的光束宽度.
  • 展示了通过调整相位差与近视角,分析轨道和发射器数量冲击来产生束.

结论:

  • 该研究通过理解非线性相互作用特征,为操纵MPA提供了坚实的物理基础.
  • 非线性合提供了对声波束宽度的增强控制,并使新的波束产生成为可能,例如旋波束.
  • 实验验证证证实了理论分析,为高级MPA应用铺平了道路.