Abstract
The dependencies of fluctuating characteristics of a plasma jet such as gas temperature, radiation intensity, electron temperature, electron density, jet length and jet width on the applied magnetic flux density and oscillation frequency are experimentally clarified, when the oscillating flow is injected into a non-equilibrium plasma jet as a disturbance. It is found that the radiation intensity is selected as an adjustable controlled variable, and the magnetic flux density as a manipulated variable, respectively, for feedback control system. Because all the fluctuating characteristics are suppressed effectively by applying magnetic field and the radiation intensity especially has a rapid response to the applied magnetic field. Finally, feedback control system is successfully constructed for an oscillating plasma jet to increase process efficiency in a stable plasma spraying for example. Constant value control of radiation intensity fluctuation and jet width fluctuation are achieved by using PID control method to stabilize an oscillating plasma jet.
| Original language | English |
|---|---|
| Pages (from-to) | 691-697 |
| Number of pages | 7 |
| Journal | Vacuum |
| Volume | 73 |
| Issue number | 3-4 |
| DOIs | |
| Publication status | Published - 2004 Apr 19 |
| Event | The 4th International Symposium on Applied Plasma Science - Kyoto, Japan Duration: 2003 Sep 1 → 2003 Sep 5 |
Keywords
- Feedback control
- Flow oscillation
- Magnetic field
- Plasma jet
- Radiation intensity
- Thermal spraying
ASJC Scopus subject areas
- Instrumentation
- Condensed Matter Physics
- Surfaces, Coatings and Films