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<p>Established optical techniques for measuring plasma flow speeds, for example Fabry–Pérot interferometry (FPI), are challenging due to the need for accurate alignment and complex data acquisition and evaluation. As a novel alternative, we propose using an event-based camera to determine velocities in a transparent, particle-free plasma jet by tracing the flow of radiating flow features across the field of view. The potential of this new technique is assessed by studying a fast hydrogen-helium plasma flow in an arcjet-driven facility. Data analysis yields temporally and spatially resolved axial velocities. The determined axial velocity profile qualitatively matches the observed supersonic flow structure and ranges between 8 and 20&#xa0;km/s. For a given position, flow speeds vary by about ±3&#xa0;km/s, which is either attributed to measurement uncertainties or to actual variations. The mean values compare well to FPI measurements.</p>

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Flow speed analysis of transparent plasma flows using an event-based camera

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月20日

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  • Martin Eberhart,
  • David Leiser,
  • David Steuer,
  • Stefan Loehle

摘要

Established optical techniques for measuring plasma flow speeds, for example Fabry–Pérot interferometry (FPI), are challenging due to the need for accurate alignment and complex data acquisition and evaluation. As a novel alternative, we propose using an event-based camera to determine velocities in a transparent, particle-free plasma jet by tracing the flow of radiating flow features across the field of view. The potential of this new technique is assessed by studying a fast hydrogen-helium plasma flow in an arcjet-driven facility. Data analysis yields temporally and spatially resolved axial velocities. The determined axial velocity profile qualitatively matches the observed supersonic flow structure and ranges between 8 and 20 km/s. For a given position, flow speeds vary by about ±3 km/s, which is either attributed to measurement uncertainties or to actual variations. The mean values compare well to FPI measurements.