Multiphysics modelling of MarsTEM shield

MarsTEM, the temperature sensor of the DREAMS (Dust characterization, Risk assessment and Environment Analyzer on the Martian Surface) package, which will fly on ExoMars 2016 EDM (Entry, Descent and landing demonstrator Module), will provide atmosphere temperature measurements near Mars´ surface. As an effect of direct solar radiation, environment albedo and thermal infrared radiation, these temperature measurements will be modified. Therefore, the possibility to design a radiation shield in the sensor structure has been evaluated. Multiphysic simulations have been done in order to quantify the effect of direct solar radiation and thermal infrared radiation on sensor measurements for three different configurations: five-plates shield, three-plates shield and no-shield. Two different materials have been considered: aluminium alloy and titanium alloy. The results of our analysis show that at the Martian noon the best configuration is the no-shield one. In the second part of the paper it is shown the thermal model of the final MarsTEM version.