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A series of NiTi-20Hf high-temperature shape memory alloys with varying nickel content from 50 to 51% were subjected to solution and aging heat treatments, thermal cycling, and hardness testing. Transformation temperatures for all conditions were measured and found to decrease as a function of increasing Ni content up to 50.5%. There was a gradual increase or consistent temperature for Ni contents...
Accurate laboratory measurement of the IV parameters of multi-junction (MJ) solar cells is highly dependent on the incident spectrum. This paper examines the influence of simulator spectrum on MJ solar cell measurements through the use of a multi-zone solar simulator capable of varying light output on each MJ subcell independently. It is shown through solar simulator spectrum offset that standard...
The traditional modular building block for space solar arrays consists of solar cells mounted to an aluminum honeycomb panel with carbon composite facesheets. This design not only provides the structural rigidity for the array, but is critical for heat dissipation during operation in the space. The honeycomb provides consistent thermal conduction and emissive properties throughout the panel, and good...
For a solar array powering a mission designed to operate near the sun, a trade study was performed to calculate the effect of changing the operating temperature of the solar array on the required area of the thermal radiator required to moderate the array temperature.
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