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相关概念视频

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

772
A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
772
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...
191

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相关实验视频

Updated: Jun 10, 2025

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
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基于最佳非线性频率调制激发的高分辨率二极管远程检测记录.

Xueshen Cao1,2,3, Hao Chen1,2,3, Chao Li1,2,3

  • 1State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China.

Sensors (Basel, Switzerland)
|October 16, 2024
PubMed
概括

一种新的最佳非线性频率调制 (ONLFM) 激发方法增强了二极管远程检测记录. 这种先进的技术提高了信号噪声比 (SNR) 和分辨率,从而提高了检测范围和成像质量.

关键词:
双极日志记录 双极日志记录非线性频率调制的非线性频率调制.优化的优化优化优化.远程检测 远程检测 远程检测 远程检测

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相关实验视频

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科学领域:

  • 地质物理学 地质物理学
  • 信号处理 信号处理

背景情况:

  • 双极远程检测记录需要改进检测范围和成像分辨率.
  • 传统的电脉冲声源在能量和频段范围方面存在局限性.

研究的目的:

  • 为双极远程检测记录提出一个最佳的非线性频率调制 (ONLFM) 激发方法.
  • 为了提高信号噪声比 (SNR) 和反射波的分辨率.

主要方法:

  • 用SNR和分辨率作为目标函数设计了声音源的最佳波形模型.
  • 采用多约束优化方法,用模拟回火方法解决问题.
  • 利用静止相原理来设计基于最佳频谱的ONLFM波形.

主要成果:

  • 与传统方法相比,ONLFM声源显示出更好的能量和更大的频段范围.
  • 模拟证实了SNR的有效增强和反射波的分辨率.
  • 在双极剪波远程检测中,ONLFM方法带来了更好的检测范围和成像分辨率.

结论:

  • 拟议的ONLFM激发方法显著提高了双极远程检测记录的性能.
  • 这种技术为在地球物理勘探中实现更高分辨率和扩展检测范围提供了可行的解决方案.