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相关概念视频

Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
663
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
657
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
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NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

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When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
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Magnetic Resonance Imaging01:24

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Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
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Mass Analyzers: Common Types01:19

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The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
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相关实验视频

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Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples
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基于复合三稳定随机共振系统的磁异常检测.

Jinbo Huang1, Zhen Zheng1, Yu Zhou1

  • 1School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.

Sensors (Basel, Switzerland)
|November 25, 2023
PubMed
概括

一个新的复合三稳定静态共振 (CTSR) 模型改善了在杂环境中弱磁异常检测. 这种先进的模型比传统方法提供了更好的噪音利用和参数控制.

关键词:
复合物三稳定性的复合物磁性异常检测检测 磁性异常检测信号与噪声的比率.随机共振是指随机的共振.

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科学领域:

  • 信号处理 信号处理
  • 非线性动力学是一种非线性动力学.
  • 地质物理学 地质物理学

背景情况:

  • 双稳定随机共振 (BSR) 模型在弱信号检测的参数合方面遇到了困难.
  • 传统的三稳定随机共振 (TTSR) 模型表现出严重的系统参数合,阻碍了潜在的功能调节.
  • 强大的背景噪声需要先进的模型来有效检测弱信号.

研究的目的:

  • 提出一种新的复合三稳定静态共振 (CTSR) 模型,用于增强弱磁异常信号检测.
  • 为了克服传统三稳模型的参数合限制.
  • 开发一个强大的检测系统,改进噪声利用和参数调节性.

主要方法:

  • 一个复合三稳定静态共振 (CTSR) 模型是通过将高斯潜能模型与混合双稳定模型集成而开发的.
  • 设计了一个弱磁异常信号检测系统,其中包含了CTSR系统和基于统计分析的判断系统.
  • 使用量子遗传算法 (QGA) 优化了系统参数,以最大限度地提高输出信号噪声比 (SNR).

主要成果:

  • 与传统的三稳定随机共振 (TTSR) 和双稳定随机共振 (BSR) 系统相比,CTSR系统表现出优异的性能.
  • 该CTSR系统实现了接近80%的检测概率,即使输入SNR为-8dB.
  • 开发的系统成功检测到弱磁异常信号,并保存了有关铁磁目标相对运动 (方向) 的信息.

结论:

  • 拟议的CTSR模型有效地解决了三稳定系统中的参数合问题.
  • 在强背景噪声条件下,CTSR系统在弱信号检测方面提供了显著的改进.
  • 这种先进的检测系统为识别磁异常和目标运动信息提供了强大的解决方案.