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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

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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.
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相关实验视频

Updated: Jun 3, 2025

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
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Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies

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基于光学生成的频率调制脉冲的微秒响应超快微波测距方法.

Yifei Sun1,2, Yongchao Chen1, Longhuang Tang1

  • 1National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 622150, China.

Sensors (Basel, Switzerland)
|January 11, 2025
PubMed
概括
此摘要是机器生成的。

这项研究引入了一种使用光学生成脉冲的超快微波测距方法. 新技术显著提高了距离测量的时间分辨率,改进了现有技术.

关键词:
移位变化 变化 移位变化微波 FMCW 雷达 微波 FMCW 雷达 雷达超快的距离距离可以实现.

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科学领域:

  • 光学和光子学 在光学和光子学.
  • 微波工程 微波工程
  • 计量学 计量学 计量学

背景情况:

  • 传统的微波测距方法在动态位移测量时面临时间分辨率的限制.
  • 频率调制连续波 (FMCW) 雷达是测距的关键技术,但可以受到脉冲生成能力的限制.

研究的目的:

  • 提出并演示使用光学生成的频率调制微波脉冲进行超快的微波测距方法.
  • 为了实现显著改善时间分辨率的移位变化测量.
  • 为了提高微波FMCW雷达系统的性能.

主要方法:

  • 在不平衡的分散下对秒激光干扰进行理论分析,以产生纳秒级的线性频率调制微波脉冲.
  • 应用频率调制连续波 (FMCW) 雷达原理用于位移测量.
  • 拟议方法的原则证明实验验证.

主要成果:

  • 成功生成纳秒级线性频率调制微波脉冲.
  • 实验测量位移变化,在0.6米范围内的误差为2.5毫米.
  • 与现有技术相比,实现了468ns的响应时间,比现有技术的时间分辨率提高了两倍.

结论:

  • 基于光学生成的FMCW脉冲的拟议超快微波测距方法提供了优越的时间分辨率.
  • 这一进步显著提高了各种应用中的高速位移变化测量能力.
  • 该方法为需要高时间精度的微波FMCW雷达系统提供了实质性的改进.