The Libera instrument is being developed as part of a NASA Earth Venture Continuity mission for extending Earth radiation budget (ERB) measurements by the currently operational Clouds and the Earth’s Radiant Energy System (CERES) instruments into the future. Libera will be launched on NOAA’s JPSS-4 satellite. Libera introduces several new technologies, including advanced VACNT detectors, a split-shortwave channel to quantify shortwave near-IR and visible radiation, and a wide field of view camera (WFC) that advance the state-of-the-art in Earth radiation budget measurements. The WFC is a monochromatic wide field of view camera operating at 555nm over a 123-degree field of view that will continuously observe the full Earth disk from low-earth orbit. The WFC provides a unique capability for scene identification and Angular Distribution Model (ADM) generation that complements similar measurements from the VIIRS instrument that will fly on JPSS-4 with Libera. By demonstrating that Libera’s WFC provides the data required for ADM development, a path forward for future free-flier ERB measurements will be explored. We focus on the development of the WFC, its science objectives, unique design features, its current state of development, and how it could help to enable a constellation of smaller, more cost-effective ERB instruments for the future.
Interdisciplinary capstone design projects are a required part of many of the engineering programs across the US and have been proven to be highly impactful for preparing students for industry. The University of Arizona College of Engineering program places five to six students on a team sponsored predominantly by industry partners. Over the course of the academic year, students work to meet the requirements of the industry sponsor and ultimately present their results at a celebratory event called Design Day. The authors have been students, mentors, and now sponsors of projects through BAE Systems (formerly Ball Aerospace). This paper describes our general philosophy to designing a great project that will challenge and grow the students on the team and give them a taste of what work at our company is like. The paper will give several example projects across the past years to showcase what went well and what can be improved, as well as summarizing general roadblocks students consistently experience for other mentors to be aware of.
Sequential analysis of stray light through a system in the past has only incorporated stray light from a point source scattering off optical surfaces due to contamination and roughness. Any analysis requiring more fidelity required the power of non-sequential ray trace software, which is limited in both speed and sampling. The software presented in this paper expands upon the previously discussed sequential analysis by adding more functionality and detail to the analysis. This includes scatter contributions from an ideal mechanical baffle located at the entrance to the system and the stray light resulting from extended sources, such as an illuminated Earth or Moon. An example case study is presented to demonstrate the correlation to a matching non-sequential analysis of the system.
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