To solve the problem of thermal control coatings degradation in space environment, it is necessary to study coatings
degradation law in simulated space environment, thus a radiometer design based on calorimetry was proposed for in
situ measurement of thermal control coatings solar absorptance. The radiometer structure was designed according
to the requirement of in situ measurement. By conducting thermal analysis on radiometer, the heat transfer
equations were built and a calculation model based on transient thermal equilibrium was established by energy
conservation principle. A SR107 thermal control coating was tested in isoperibol. The experiment result shows a
within 3% relative error between the solar absorptance of SR107 and the coating calibration value, with a 5.24%
measurement uncertainty. It validates the effectiveness of radiometer experiment and lays a foundation for further
development of thermal control coating performance test.
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