Measurement of the Absorptance-emittance of Black Paint Surfaces at Temperatures From 10 To 120[K].

Details Measurement of the Absorptance-emittance of Black Paint Surfaces at Temperatures From 10 To 120[K]. Measurement of the Absorptance-emittance of Black Paint Surfaces at Temperatures From 10 To 120[K].

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.558..365j&link_type=abstract

Proceedings of the 5th International Symposium on Environmental Testing for Space Programmes Noordwijk, The Netherlands (ESA SP-

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The PLANCK satellite, the third medium-size (M3) mission of Horizon 2000 program of the European Space Agency, will provide data to understand the origin and the evolution of our Universe. CSL is in charge of the whole satellite thermal vacuum testing, and will perform the only on-ground verification of the overall satellite, including its thermal performances. It is necessary to reproduce the deep cold space by thermal shrouds. The thermal requirements for these shrouds are not only to support a heat load of 50 [W] at a temperature lower than 20 [K] but also mainly to avoid cross-coupling from the warm parts of the spacecraft to the colder payload. The thermal shrouds are copper plates coated with a black paint on their inner face. Due to the main requirement, the choice of the paint, driven by its emittance-absorptance property, is one of the major parameter of the test set-up. A measurement bench for emittance-absorptance measurements was developed previously[1] for the testing of the METEOSAT SECOND GENERATION (MSG) set-up at CSL premises. The measurements were performed on flat plates and on an aluminium open honeycomb glued on a copper plate. The results showed that the best coating for this type of application is the PU1 paint from MAP in France. Due to the criticality of this parameter, deeper investigations on flat and open honeycomb surfaces absorptance-emittance measurements were required. The measurement bench has been improved, and the measurement post-treatment has also been strongly modified. Measurements of absorptance at 10 [K], for radiation coming from body in the range from 40 to 120 [K], have been performed together with emittance measurements in the range from 40 to 80 [K].

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