Speaker
Lukáš Kusýn
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/P1.3012.pdf
Automatized analysis of interferometric measurements on nanosecond
pulsed discharge in liquid water
L. Kusýn1 , P. Hoffer2 , Z. Bonaventura1 , T. Hoder1
1 Department of physical electronics, Masaryk University, Brno, Czech Republic
2 Institute of Plasma Physics, Czech Academy of Sciences, Praha, Czech Republic
Fundamental physics of the discharge development in dielectric liquids is still a subject of
controversy. While the modern plasma physical concepts describe phenomena in low-temperature
gas-discharges with relatively high precision: from microscopic charge multiplication by elec-
tron avalanching to macroscopic parameters such as temperature, this is not the case for dis-
charges in liquid phase. The crucial problems of primary electron multiplication in bubble-free
liquid, picosecond timescales conditioned by molecular density, and dielectric properties of po-
lar water molecules exposed to fast changing external electric field, constitute permanent chal-
lenges for physicists. One of the method to experimentally reveal the fast micro-physics taking
place in mentioned discharges is the Mach-Zehnder interferometry for evaluation of changes
in refractive index of studied media. This can be further used to estimate the pressure or elec-
tric field distribution which is generated by the nanosecond high-voltage pulse applied onto the
metal electrode inserted in the water.
In this contribution the interferograms generated
for studied discharge case (see Fig.1) will be anal-
ysed and appropriate methods for automatic pro-
cessing will be proposed. Evaluated data will be
compared to the manually prepared results and the
quality critically reviewed. Such an automatized ap-
proach will enable processing of large amount of
experimental data using advanced statistical meth-
ods. We expect that a new inside into the phenom-
ena of nanosecond discharges in liquid media can
be revealed. This contribution is funded by Czech
Figure 1: Typical interferogram of the pulsed
Science Agency grant no. 18-04676S.
discharge in water media, taken from [1].
References
[1] Hoffer P. 2014 Shock waves generated by corona-like discharges in water, doctoral thesis, CTU, Praha, Czech
Republic
