Speaker
Robert Miotk
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/P1.3011.pdf
Analysis of the tuning characteristics of low-power microwave device for
generation of plasma sheet
R. Miotk1, M. Jasiński1
1
Institute of Fluid Flow Machinery, Polish Academy of Sciences, Gdańsk, Poland
A novel, recently patented by us plasma source with unique shape of plasma (i.e. plasma
sheet) is presented in this paper. The presented source generates non-thermal plasma using the
2.45 GHz microwaves in any gases under reduced, atmospheric and greater than atmospheric
pressure. This plasma source is simple and the unique shape of generated plasma sheet is very
convenient for surface treatment, thus it is attractive for industry
The plasma source was tested for surfaces treatment. The following materials were
subjected to the plasma treatment process: caoutchoucs, PC (polycarbonate) and PMMA
(poly(methyl methacrylate)). The water contact angle (WCA) directly after plasma treatment
dropped 1.6-4.8 times. The WCA 200 hours after plasma treatment is lower 1.7-1.5 times
relative to WCA before plasma treatment. The experimental investigations proved high
potential of the presented method for the surfaces activation in industrial applications.
The ageing of adhesion enhancement effect indicates that water contact angle is related to
the surface energy changes.
Due to industrial requirements regarding low costs of generated discharge in this work we
focus on analysis of the tuning characteristics of the device. The tuning characteristics
is a dependence of reflected microwaves power PR to the incident microwaves power PI
as a function of position of a movable plunger ls. In general the plasma source is efficient when
the ratio PR/PI is close to zero and it is stable when this ratio does not depend on the position
of the movable plunger ls. Our preliminary experimental tests showed that the presented device
requires improvement in order to increase its power coupling efficiency from the supply line
to the generated plasma. Therefore, the presented in this work research is the first stage
in the process of improving this device for increasing its energy efficiency and stability
performance.
Acknowledgements:
We are grateful to The National Science Centre, Poland (programme no.
2015/19/B/ST8/02123) and the Foundation for Polish Science (FNP programme START no.
53.2017) for the financial support of this work
