Abstract: OARDAS (Off-Axis Rejection Design Analysis Software) is a Raytheon in-house code designed to aid in stray light analysis. The code development started in 1982, and by 1986 the program was fully operational. Since that time, the work has continued - not with the goal of creating a marketable product, but with a focus on creating a powerful, user- friendly, highly graphical tool that makes stray light analysis as easy and efficient as possible. The goal has been to optimize the analysis process, with a clear emphasis on designing an interface between computer and user that allows each to do what he does best. The code evolution has resulted in a number of analysis features that are unique to the industry. This paper looks at a variety of stray light analysis problems that the analyst is typically faced with and shows how they are approached using OARDAS.!0
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