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Optical Design and Predicted Performance of the WFIRST Phase-B Imaging Optics Assembly and Wide Field InstrumentNow in Phase-B, the architecture of the Wide-Field Infra-Red Survey Telescope (WFIRST) payload has matured since 2013 to accommodate various opto-mechanical constraints. Based on a 2.4-meter aperture Forward Optical Assembly (FOA), the Imaging Optics Assembly (IOA) provides corrected optical fields to each on-board instrument. Using a Three Mirror Anastigmat (TMA) optical design, the Wide-Field Channel (WFC) provides ~1/3-square degree of instantaneous field coverage at 0.11 arcsecond pixel scale. The WFC as-built predictive analysis anticipates near diffraction-limited imaging over a focal plane of 300.8 million pixels, operating in seven panchromatic bands between 0.48 - 2.0μm, or a 1-octive multi-spectral imaging mode from ~0.95-1.93μm. The IOA provides the Coronagraph Instrument (CGI) a collimated beam with very specific wavefront constraints. We present configuration changes since 2013 that improved interfaces, improved testability, and reduced technical risk. We provide an overview of our Integrated Modeling results, performed at an unprecedented level for a phase-A study, to illustrate performance margins with respect to static wavefront error, jitter, and thermal drift.
Document ID
20180006984
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Pasquale, Bert A.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Casey, Thomas
(ASRC Aerospace Corp. Greenbelt, MD, United States)
Marx, Catherine
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Gao, Guangjun
(Sigma Space Corp. Lanham, MD, United States)
Armani, Nerses
(Stinger Ghaffarian Technologies, Inc. Greenbelt, MD, United States)
Content, David
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Hagopian, John
(Applied Technology Associates (ATA) Aerospace Greenbelt, MD, United States)
Jurling, Alden
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Jackson, Clifton
(SGT, Inc. Greenbelt, MD, United States)
Liu, Alice
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Whipple, Art
(Conceptual Analytics, LLC Glenn Dale, MD, United States)
Murray, Jacob
(Rose-Hulman Inst. of Tech. Terre Haute, IN, United States)
Date Acquired
October 25, 2018
Publication Date
August 21, 2018
Subject Category
Optics
Report/Patent Number
GSFC-E-DAA-TN61236
Report Number: GSFC-E-DAA-TN61236
Meeting Information
Meeting: SPIE Optics & Photonics 2018
Location: San Diego, CA
Country: United States
Start Date: August 21, 2018
End Date: August 23, 2018
Sponsors: International Society for Optical Engineering
Funding Number(s)
CONTRACT_GRANT: NNG13CR48C
CONTRACT_GRANT: NNG15CR64C
Distribution Limits
Public
Copyright
Use by or on behalf of the US Gov. Permitted.
Keywords
Dark Energy
Spaceborne telescopes
Optical Instrumentation
Infared
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