Single-shot 3D imaging of hydroxyl radicals in the vicinity of a gliding arc discharge

Forskningsoutput: TidskriftsbidragLetter

Abstract

Chemical processing by plasma is utilized in many applications. Plasma-related studies, however, are challenging to carry out due to plasmas' transient and unpredictable behavior, excessive luminosity emission, 3D complexity and aggressive chemistry and physiochemical interactions that are easily affected by external probing. Laser-induced fluorescence is a robust technique for non-intrusive investigations of plasma-produced species. The hydroxyl radical (OH) is an interesting molecule to target, as it is easily produced by plasmas in humid air. In this letter, we present 3D distributions of ground state OH radicals in the vicinity of a glow-type gliding arc plasma. Such radical distributions, with minimal plasma emission, are captured instantaneously in one single camera acquisition by combining structured laser illumination and a lock-in based imaging analysis method called FRAME. The orientation of the plasma discharge can be reconstructed from the 3D data matrix, which can then be used to calculate 2D distributions of ground state OH radicals in a plane perpendicular to the orientation of the plasma channel. Our results indicate that OH distributions around a gliding arc are strongly affected by gas dynamics. We believe that the ability to instantaneously capture 3D transient molecular distributions in a plasma discharge, with minimal plasma emission interference, will have a strong impact on the plasma community for in-situ investigations of plasma-induced chemistry and physics.

Detaljer

Författare
Enheter & grupper
Externa organisationer
  • Swedish Defense Research Agency
  • Shanghai Jiao Tong University
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Fusion, plasma och rymdfysik

Nyckelord

Originalspråkengelska
Artikelnummer04LT04
TidskriftPlasma Sources Science and Technology
Volym30
Utgåva nummer4
Tidigt onlinedatum2021 jan 11
StatusPublished - 2021 apr 1
PublikationskategoriForskning
Peer review utfördJa