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SMV-2017-26: Upgrade of the apparatus Spaceman – capacitive system for the measurement of the sample thickness
 Králík, Tomáš
The goal of this research cooperation, which is follow- up of the previous cooperation, was an upgrade of the apparatus Spaceman. The upgrade enables to obtain new data of the spacers used in the multilayer insulations. The spacer can be woven or non-woven textile made of glass, plastic or natural fibres. The apparatus Spaceman measures heat flow through a sample of the spacer in the range from 10 K to 290 K in vacuum. The temperature drop on the sample is typically 5 K. The apparatus was enhanced by a system for measurement of the in-situ sample thickness from evaluation of the electrical capacity between electrically conductive contact surfaces. The upgrade was done by particular disassembling of the apparatus, modification or exchange of some parts, welding of a new vacuum feed trough in the apparatus lid, development and installation of a new electronic in the vacuum space. The electronic is placed in the upper part of the apparatus at room temperature and the electrical capacitance is measured by a special cryogenic coaxial cable. The electronic is able to cancel a parasitic capacitance of the cable. Some modifications were done on the Labview control software developed for the apparatus. The apparatus now enables to measure not only the thermal conductivity at various temperatures and loads but also changes of the sample thickness due to thermal dilatations and loads. It is also possible to evaluate an elastic behaviour of the sample at temperatures from 10 K to 290 K.
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