Size and electron density of open-air plasmas diagnosed by optical imaging
Author(s)
Feng, BW
Zhong, XX
Zhang, Q
Chen, F
Sheng, ZM
Ostrikov, Kostya Ken
Griffith University Author(s)
Year published
2019
Metadata
Show full item recordAbstract
A method for accurate measurements of the size and electron density of open-air plasmas by optical imaging is developed. The plasma size is determined by the intensified charge coupled device (ICCD) imaging and is related to the plasma inductance. The plasma density is then derived from the plasma inductance in open air. The electron densities measured by the ICCD imaging agree well with the reliable Stark broadening method, in stark contrast with the commonly used current–voltage I–method. These shortcomings of the I– method arise because of its heavy reliance on electron mobility values which are uncertain in complex gas ...
View more >A method for accurate measurements of the size and electron density of open-air plasmas by optical imaging is developed. The plasma size is determined by the intensified charge coupled device (ICCD) imaging and is related to the plasma inductance. The plasma density is then derived from the plasma inductance in open air. The electron densities measured by the ICCD imaging agree well with the reliable Stark broadening method, in stark contrast with the commonly used current–voltage I–method. These shortcomings of the I– method arise because of its heavy reliance on electron mobility values which are uncertain in complex gas mixtures such as air. This work thus presents a new way of using the ICCD imaging to determine the plasma size and electron density and as such contributes to the development of next-generation plasma diagnostic methods.
View less >
View more >A method for accurate measurements of the size and electron density of open-air plasmas by optical imaging is developed. The plasma size is determined by the intensified charge coupled device (ICCD) imaging and is related to the plasma inductance. The plasma density is then derived from the plasma inductance in open air. The electron densities measured by the ICCD imaging agree well with the reliable Stark broadening method, in stark contrast with the commonly used current–voltage I–method. These shortcomings of the I– method arise because of its heavy reliance on electron mobility values which are uncertain in complex gas mixtures such as air. This work thus presents a new way of using the ICCD imaging to determine the plasma size and electron density and as such contributes to the development of next-generation plasma diagnostic methods.
View less >
Journal Title
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume
52
Issue
26
Subject
Physical sciences
Engineering