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NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

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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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Related Experiment Video

Updated: Apr 25, 2026

Direct Imaging of Laser-driven Ultrafast Molecular Rotation
10:52

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Published on: February 4, 2017

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Note: High resolution ultra fast high-power pulse generator for inductive load using digital signal processor.

Eli Flaxer1

  • 1AFEKA - Tel-Aviv Academic College of Engineering, 69107 Tel-Aviv, Israel.

The Review of Scientific Instruments
|September 1, 2014
PubMed
Summary
This summary is machine-generated.

A new compact, ultra-fast pulse generator was designed for inductive loads. This high-power, high-resolution device improves upon previous designs and drives next-generation supersonic pulsed valves.

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Area of Science:

  • Electrical Engineering
  • Physics
  • Materials Science

Background:

  • High-power pulse generators are essential for various scientific and industrial applications.
  • Existing pulse generator designs often face limitations in speed, resolution, and power handling for demanding loads.
  • Inductive loads, such as pulsed valves, require specialized pulse generation for optimal performance.

Purpose of the Study:

  • To introduce a novel design for a compact, ultra-fast, high-resolution, and high-powered pulse generator.
  • To enhance the performance of pulse generators for inductive loads, specifically for driving advanced supersonic pulsed valves.
  • To present an improved circuit design over previous controller versions.

Main Methods:

  • The pulse generator utilizes a power Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) as the primary switching element.
  • A dedicated gate driver circuit ensures efficient and rapid switching of the MOSFET.
  • A digital signal controller manages the pulse generation sequence and parameters, enabling precise control.

Main Results:

  • The developed pulse generator demonstrates compact dimensions, ultra-fast switching speeds, and high-resolution pulse shaping.
  • The device delivers high power output suitable for driving challenging inductive loads.
  • Performance was validated by successfully operating a new generation of high-pressure supersonic pulsed valves.

Conclusions:

  • The new pulse generator design offers significant improvements in speed, resolution, and power for inductive load applications.
  • This technology is well-suited for driving advanced supersonic pulsed valves, enabling new research and applications.
  • The improved circuit design represents a substantial advancement in pulse generation technology.