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Inductance: Single-Phase And Three-Phase Line01:28

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In electrical power systems, understanding the capacitance of transmission lines is fundamental for efficient operation.
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A three-phase AC generator has a rotor with a rotating magnet placed within the stator mounted with the stationary three-phase winding to generate three-phase voltages via mutual induction. These windings are evenly distributed around the inner circumference of the stator and are arranged 120 electrical degrees apart. Three-phase stator windings consist of three separate coils or groups of coils, known as phases, each connected in Y (star) configuration or Delta configuration.
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Time-resolved second harmonic generation with single-shot phase sensitivity.

Alexandra L Tyson1, David A Woods1, Jan R R Verlet1

  • 1Department of Chemistry, Durham University, Durham DH1 3LE, United Kingdom.

The Journal of Chemical Physics
|December 4, 2018
PubMed
Summary
This summary is machine-generated.

This study introduces a new time-resolved, phase-sensitive second harmonic generation (SHG) method. This technique offers high sensitivity and stability for probing excited state dynamics at interfaces.

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Area of Science:

  • Physical Chemistry
  • Surface Science
  • Spectroscopy

Background:

  • Understanding interfacial species dynamics is crucial in various chemical and physical processes.
  • Existing methods may lack the sensitivity or phase information required for detailed excited state analysis.

Purpose of the Study:

  • To present a novel time-resolved, phase-sensitive second harmonic generation (SHG) method.
  • To enable detailed probing of excited state dynamics of interfacial species with high precision.

Main Methods:

  • Utilizes an interference measurement between sample SHG and a local oscillator.
  • Employs a spatially varying phase unit for single-shot interference pattern recording.
  • Incorporates 30 kHz modulation for shot-to-shot pump-probe measurements.

Main Results:

  • Successfully measured time-resolved changes in interference pattern amplitude and phase.
  • Demonstrated the technique's ability to track excited state dynamics of malachite green dye at the air/water interface.
  • Characterized by excellent phase stability and sensitivity.

Conclusions:

  • The developed SHG method provides a powerful tool for interfacial dynamics studies.
  • Offers high sensitivity, excellent phase stability, and relatively short data acquisition times.
  • Suitable for investigating excited state properties of molecules at interfaces.