  In this work, a non-intrusive, spatially resolved, spectro-tomographic
optical diagnostic of the electronic density and temperature on the linear
plasma column Mistral is presented. Coupling of spectroscopy and tomography
technique gives access to the local plasma light emission at different
wavelengths (visible and near IR) in an argon plasma. Taking advantage of the
symmetry of the Mistral experiment, the diagnostic results are validated and
the plasma is found to correspond to a corona equilibrium state. With the use
of another spectrometer and a Langmuir probe, we propose a non-intrusive method
to determine the electronic density and temperature of each pixel of the
tomographic images of the plasma. The obtained results are in good agreement
with the Langmuir probe ones.
