Fig. 1. Solar spectral irradiance in Earth orbit. The SRSS for terrestrial uses as shown in Fig. 2 has already been put into practice by a Japanese company. The assembly of a solar ray collector is installed in a spherical capsule made from an acrylic resin to protect it from the weather. This device is composed of solar ray collectors, the sun sensor, the sun tracking mechanism, and the light-conducting fiber cable. The solar rays are collected and concentrated to about 3,000 x the original solar intensity by means of a Fresnel lens. The focal point of each lens coincides with the end of a light-conducting fiber cable. The concentrated solar rays can be utilized by means of various terminal illuminating devices suitable for each purpose. As one unique feature of the apparatus, it can eliminate ultraviolet and infrared radiation harmful for the living things by means of chromatic aberration of a simple lens structure. CONCEPTUAL APPLICATION OF SRSS TO SPACE STATION Figure 3 shows the conceptual diagram of SRSS in space station. The solar rays are collected and concentrated to 10,000 x the original solar intensity by means of a solar ray collector attached outside of the space station module. The spectral adjustment is performed by means of the characteristics of chromatic aberration inherent in Fresnel lens and/or the appropriate filter. On the life science experiments, the harmful part of solar rays (ultraviolet part below 350 nm of wavelength and infrared part above 850 nm) are eliminated. The concentrated solar rays are transmitted through a light conducting fiber cable into the Utility Module. The solar rays led into the module are distributed to the other modules by means of a rigid trunk light path furnished in each module, which is similar to the conventional electric power supply system. On the light transmitting path are various types of connectors and unions,
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