组合光学太阳反射镜的热辐射性能测量

用量热计法测量了通信广播卫星上用的光学太阳反射镜（ＯＳＲ）的太阳吸收比αｓ和半球发射率εＨ。为了准确计算卫星的温度分布，测量的是组合ＯＳＲ样品的热辐射性能。作为对比，同时还用量热计法和光谱法测量了单片ＯＳＲ的太阳吸收比，并且对各个测量结果及其差异进行了分析。分析表明，不应当将单片ＯＳＲ的法向太阳吸收比αｓ作为设计参数，否则将在温度计算中引起较大误差。

MEASUREMENT OF THERMAL RADIATION PROPERTIES FOR COMPOSITE OPTICAL SOLAR REFLECTOR

The measurement of the solar absorptance as and the hemispherical emittance AH were performed by the caloric method for opticalsolar reflector(OSR)that will be applied on the comnlunicationbroadcasting satellites.In order to calculate the temperature distribution of thesatellites correctly,the thermal radiation properties of the compositeOSR samples were measured.At the same time the solar absorptance of aOSR sheet was measured by both the caloric method and the spectralmethod for comparison.The measured results and the difference betweenthem were analysed.The analyses indicate that the normal solar absorptance αs.of a OSR sheet should not be taken as a design parameter,otherwise a larger error will happen in temperature calculation.