Proceedings PaperDesign for a multisolar simulator
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Multi-junction solar cells have been used for the asteroid sample return mission spacecraft, MUSUES-C, since May 2003, their spectral response ranging from 350 to 1850 nm. To use a new generation of multi-junction solar cells in space during a long duration, we must precisely evaluate their characteristics by means of an ageing test and a performance test. To cope with these issues, we need a new type of solar simulator and we call it a multi-solar simulator. This paper describes a design method for an air mass zero (AM0) multi-solar simulator according to CIE 85 (TC2-17) 1989. The multi-solar simulator consists of three kinds of lamp: Mercury lamps with high brightness in the UV region, Xenon lamps in the visible region (VR), which are equipped with an IR cut-off filter at a wavelength of more than 780 nm, and halogen lamps in the IR region, which are equipped with a VR cut-off filter at a wavelength of less than 780 nm. We can realize the AM0 spectra without spikes in this method. Light rays from those lamps housed in optical lamp houses are superposed on a test plane for testing the multi-junction solar cells. In our simulator's performance, it is possible to achieve a beam of intensity of 1.4KW/m2, a projection area of 2.5*2.5m2, and a uniformity of ±15%. Because of the beam uniformity, an ellipsoidal mirror and a partial diffusion filter are installed in each lamp-house, an angle of 10° being achieved as a half divergence angle.