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20 October 2004 Terrestrial Planet Finder control system requirements for structurally connected interferometers
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We present a study of how the TPF interferometer sensitivity relates to vibration level and control system performance. The error budgets for the TPF interferometer have two parts: the null floor, i.e. the suppression of starlight leakage due to instrument imperfections and performance limits; and null variation, i.e. planet-mimicking signal variations due to instrument errors and performance variations. The first impacts the statistical noise and thus the integration time; the second represents a planet sensitivity floor which limits further improvement with integration time. Oliver Lay (JPL) has developed an extensive analysis tool known as the Interferometer Performance Model (IPM) for managing both budgets. The budgets we use have many of the same features, but are less well-developed; the requirements are similar. Here we develop an example implementation of the TPF interferometer control system, analyze the system performance using an integrated model, and show that it meets the TPF planet sensitivity requirements using our performance budgets. We summarize key requirements and lessons arising from this exercise.
© (2004) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Charley Noecker and Mike Lieber "Terrestrial Planet Finder control system requirements for structurally connected interferometers", Proc. SPIE 5491, New Frontiers in Stellar Interferometry, (20 October 2004);


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