Normalized point source sensitivity for off-axis optical performance evaluation of the Thirty Meter Telescope

Byoung-Joon Seo; Carl Nissly; Mitchell Troy; George Angeli

doi:10.1117/12.857722

4 August 2010 Normalized point source sensitivity for off-axis optical performance evaluation of the Thirty Meter Telescope

Byoung-Joon Seo, Carl Nissly, Mitchell Troy, George Angeli

Author Affiliations +

Proceedings Volume 7738, Modeling, Systems Engineering, and Project Management for Astronomy IV; 77380G (2010) https://doi.org/10.1117/12.857722
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States

Abstract

The Normalized Point Source Sensitivity (PSSN) has previously been defined and analyzed as an On-Axis seeing-limited telescope performance metric. In this paper, we expand the scope of the PSSN definition to include Off-Axis field of view (FoV) points and apply this generalized metric for performance evaluation of the Thirty Meter Telescope (TMT). We first propose various possible choices for the PSSN definition and select one as our baseline. We show that our baseline metric has useful properties including the multiplicative feature even when considering Off-Axis FoV points, which has proven to be useful for optimizing the telescope error budget. Various TMT optical errors are considered for the performance evaluation including segment alignment and phasing, segment surface figures, temperature, and gravity, whose On-Axis PSSN values have previously been published by our group.

Citation Download Citation

Byoung-Joon Seo, Carl Nissly, Mitchell Troy, and George Angeli "Normalized point source sensitivity for off-axis optical performance evaluation of the Thirty Meter Telescope", Proc. SPIE 7738, Modeling, Systems Engineering, and Project Management for Astronomy IV, 77380G (4 August 2010); https://doi.org/10.1117/12.857722

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