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2 Journal of Technical Physics

2 2009

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Temperatures of Titan and Mars-like plasmas measured by laser interferometry

Menecier S., Legros L., Vacher D., Cerqueira N., Andre P.

Journal of Technical Physics

2009

Vol. 50, no 3

199-212

This paper presents measurements of temperature profiles of Mars and Titan-like plasmas created with an Inductively Coupled Plasma torch, using a Mach-Zehnder interferometer. Acquired interfero-grams were treated using Fast Fourier Transform and Abel inversion to obtain the radial distribution of the plasma index refraction. Temperature profiles were then obtained from the Gladstone-Dale relation, taking in account the plasma composition versus temperature.

Radiation from an ICP plasma torch in the near-UV to near-IR spectral region for a Titan-type N2-CH4 mixture

Vacher D., Dudeck M., Andre P., Lino Da Silva M., Faure G., Dubois M., Hamwi A., Menecier S., Rochette D.

Journal of Technical Physics

2009

Vol. 50, no 3

213-231

An inductively coupled plasma torch, working at atmospheric pressure, is used to create N2-CH4 Titan-like plasma (98% N2 - 2% CH4) appearing around a spacecraft. The operating frequency and power are 64 MHz and 3 kW respectively. This kind of apparatus allows to obtain plasma in chemical and quasi-thermal equilibrium. The spectral measurements covering the [320-840] nm range are performed inside the induction coil. Each interesting spectrum is calibrated and compared to the line-by-line spectral code SPARTAN used for the simulation of the radiative emission of entry-type plasma, and to the synthesized spectra realized at the LAEPT . Finally, the nucleation phenomenon that occurred in the ICP torch with the N2-CH4 plasma commented. Preliminary studies show the synthesis of nanostructured carbon on the quartz tube.