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Related Experiment Video

Updated: Jun 17, 2026

AC Electrokinetic Phenomena Generated by Microelectrode Structures

AC Electrokinetic Phenomena Generated by Microelectrode Structures

Published on: July 28, 2008

Electrode phenomena in a high current 20-nanosecond spark.

H Fischer¹, C C Gallagher

¹AFCRL (OAR), Bedford, Massachusetts 01730, USA.

|January 12, 2010

Summary

Investigating spark discharge, researchers photographed anode flares after current cutoff. These flares are identified as a predicted explosive anode erosion mechanism.

Area of Science:

Physics
Electrical Engineering

Background:

Spark discharges are crucial in various applications, but initial electrode processes remain incompletely understood.
Understanding the development of spark channels and associated optical phenomena is key to controlling discharge behavior.

Purpose of the Study:

To investigate the initial spark channel development and optical phenomena during electrode processes.
To analyze the behavior of anode flares in a high-current spark discharge.

Main Methods:

High-speed photography using a Kerr cell shutter.
Analysis of a 4000-ampere spark discharge with a 20-nanosecond duration.
Experiments conducted in 1 atm air with a 0.85 mm gap.

Main Results:

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Photographed the development of initial spark channels and optical phenomena.

Observed directed flares originating from the anode spark after current cutoff.

Tentatively identified these flares as a predicted explosive anode erosion mechanism.

Conclusions:

Anode flares observed after current cutoff suggest a significant electrode erosion process.
The findings support theoretical predictions of explosive anode erosion in spark discharges.
Further research is needed to fully elucidate the mechanisms of anode erosion in spark discharges.