Thermodiffusion, which leads to a component separation in a mixture due to the thermal gradient, still does not
have an unambiguous microscopic picture. Therefore, experimental studies, especially in convection free environment,
are important. As part of the 4th campaign on the DCMIX project, thermodiffusion experiments on
three compositions of the toluene-methanol-cyclohexane ternary mixture, on a mixture of fullerene-tetralintoluene
and on a mixture of polystyrene-toluene-cyclohexane have been performed in microgravity conditions
on board the International Space Station. A binary mixture of polystyrene-toluene has been filled into the
companion cell for the campaign. The Selectable Optical Diagnostics Instrument (SODI), wich is a two-wavelength
Mach-Zehnder interferometer for the ternary mixtures, plus a monochromatic Mach-Zehnder interferometer
for the binary mixture, has been used in order to obtain the temperature and the concentration fields
in the cells. Precisely, it is a 5-steps phase-shifting interferometry technique which is implemented with SODI,
producing by means of laser illumination a set of 5 phase-shifted images of /2 between them as function of the
time. A total of 58 runs of various durations and at different mean temperatures have been conducted. Here, we
evaluate the contrast of the interferograms, the quality in the phase stepping, the stability of the thermal regulation
of the experiments and the level of environmental disturbances on board the space station during the
campaign.