研究目的
Development and fabrication of highly efficient ultra-lightweight doubled linear Fresnel-lens concentrators of solar light for use in space solar arrays, operating in tandem with multijunction InGaP/GaAs/Ge solar cells.
研究成果
High-efficiency ultra-lightweight doubled linear lens concentrators of solar light were successfully developed and fabricated, demonstrating an optical efficiency of 90% under AM0 spectrum. The concentrators showed resilience to radiation and thermal cycling, with a 10% decrease in efficiency after electron irradiation and up to a 9% decrease after thermal cycling. The study concludes that these concentrators are suitable for use in space solar arrays, offering potential for reducing semiconductor structure expenditure and enhancing solar array efficiency and radiation hardness.
研究不足
The study acknowledges potential hazards in outer space for the concentrators, including electrization, radiation-induced chemical changes, thermal-cycling loads, and mechanical damage. The optical efficiency degradation due to these factors was quantified, with a 10% decrease after electron irradiation and up to a 9% decrease after thermal cycling.
1：Experimental Design and Method Selection:
The study involved the development and fabrication of doubled linear Fresnel-lens concentrators with a focus on achieving high optical efficiency and radiation hardness. The methodology included mathematical modeling of the concentrator's optical properties and fabrication techniques.
2：Sample Selection and Data Sources:
The concentrators were fabricated with a total photoactive area of (50 × 100) mm2, thickness of ≤0.35 mm, and an optical focus of 32 mm. The Fresnel profile was formed from silicone rubber on radiation-hard glass.
3：35 mm, and an optical focus of 32 mm. The Fresnel profile was formed from silicone rubber on radiation-hard glass.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: The setup included a pulsed solar light simulator with AM0 spectral composition, a precision measuring stand with an LLC-EGLA optical system, and test electricity-generating linear arrays (EGLA) constituted by InGaP/Ga(In)As/Ge SCs.
4：Experimental Procedures and Operational Workflow:
The optical efficiency of the concentrators was measured before and after irradiation and thermal-cycling tests. The concentrators were subjected to 1 MeV electron irradiation at various fluences and thermal cycling in the temperature range from -60 to +120oC.
5：Data Analysis Methods:
The optical efficiency was calculated based on the short-circuit current of the test EGLA when the LLC was moved relative to a diaphragm with a prescribed step, and when light passed through the diaphragm without a lens.
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