1988-07-01

Simultaneous Measurement of Solar Absorptance and Total Hemispherical Emittance 881043

An onboard simultaneous measuring method of solar absorptance αS and total hemispherical emittance εH for thermal control materials is proposed. This method allows to determine αS and εH simultaneously by giving different levels of input power to a sheet heater attached to the sample, and there is no need to use the values of the mass or the specific heat of the sample materials for the data reduction. In order to verify this method on the ground, the parameters αS and εH are measured for three kinds of thermal control materials.

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