| Issue |
Eur. Phys. J. Appl. Phys.
Volume 71, Number 2, August 2015
The 14th International Symposium on High Pressure Low Temperature Plasma Chemistry (HAKONE XIV)
|
|
|---|---|---|
| Article Number | 20804 | |
| Number of page(s) | 7 | |
| Section | Plasma, Discharges and Processes | |
| DOI | https://doi.org/10.1051/epjap/2015140491 | |
| Published online | 15 July 2015 | |
https://doi.org/10.1051/epjap/2015140491
On the fundamental relation of laser schlieren deflectometry for temperature measurements in filamentary plasmas*
1
Leibniz Institute for Plasma Science and Technology, Felix-Hausdorff-Str. 2, 17489, Greifswald, Germany
2
Department of Physical Electronics, Faculty of Science, Masaryk University, Kotláĭská 2, 61137, Brno, Czech Republic
a e-mail: jschaefer@inp-greifswald.de
Received:
12
December
2014
Revised:
18
February
2015
Accepted:
26
February
2015
Published online:
15
July
2015
Recently, laser schlieren deflectometry (LSD) had been successfully employed as a temperature measurement method to reveal the heat convection generated by micro filaments of a self-organized non-thermal atmospheric plasma jet. Based on the theory of the temperature measurements using LSD, in this work, three approaches for an application of the method are introduced: (i) a hyperbolic-like model of refractive index is applied which allows an analytical theory for the evaluation of the deflection angle to be developed, (ii) a Gaussian shape model for the filament temperature is implemented which is analyzed numerically and (iii) an experimental calibration of the laser deflection with a gas mixture of helium and argon is performed. Thus, these approaches demonstrate that a universal relation between the relative maximum temperature of the filament core (T1/T0) and a the maximum deflection angle δ1 of the laser beam can be written as T1/T0=(1 − δ1/δ0)−1, where δ0 is a parameter that is defined by the configuration of the experiment and by the assumed model for the shape of the temperature profile.
© The Author(s) 2015
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