抄録
The authors have developed a new thermal control device called Smart Radiation Device (SRD) for space use. SRD regulates amount of heat radiation to space without mechanism unlike conventional thermal louvers. Its variable emittance function is based on the metal-insulator transition of the ceramic material, La_<1-x-y>Sr_xCa_yMnO_3. The authors have developed two types of SRD, bulk-type and the thick film type and conducted flight demonstration of them on MUSES-C "HAYABUSA" and INDEX "REIMEI" respectively. Flight temperature data proved that bulk-type and thick film type SRD saved heater power and suppressed temperature drop as expected. We have been developing third type of SRD, which is with multi-layer solar reflecting coating. We have achieved drastic reduction of solar absorptance from 0.81 to 0.2. The Multi-layer type SRD is now subjected to atomic oxygen (AO) simulation test as the final step of qualification. Moreover, we expect that SRD is also effective for energy conservation of terrestrial products such as house, window glass and so on.
