Data analysis algorithm for double-pass testing of the Roman Space Telescope

Matthew D. Bergkoetter; Alden S. Jurling

doi:10.1117/12.2567347

20 August 2020 Data analysis algorithm for double-pass testing of the Roman Space Telescope

Matthew D. Bergkoetter, Alden S. Jurling

Proceedings Volume 11488, Optical System Alignment, Tolerancing, and Verification XIII; 114880L (2020) https://doi.org/10.1117/12.2567347
Event: SPIE Optical Engineering + Applications, 2020, Online Only

Abstract

Double-pass optical testing will play a key role in the alignment and verification of the Roman Space Telescope (RST), NASA’s upcoming flagship astrophysics mission, which was formerly known as the Wide Field Infrared Survey Telescope or (WFIRST). In this test configuration, optical fibers adjacent to the focal plane detector array will send light through the entire optical system in reverse, to be reflected off an auto-collimating flat (ACF) mirror and back through the system a second time (at a different angle) before reaching the detector. The ACF will be tilted through a range of angles to provide samples across the entire field of view, which is exceptionally large for a space telescope and will exhibit measurable field-dependent aberration. Phase retrieval analysis of the resulting point-spread functions will provide wavefront estimates; however, these wavefronts will include aberrations that were accumulated on both passes through the system at their respective field angles. In order to evaluate the alignment and verification of the system, we must predict the performance of the observatory when operating in single-pass. Therefore, we present an algorithm that will separate the aberrations from the two passes to provide a prediction of the telescope’s performance in single-pass. This is done by fitting the data to a polynomial representation of the underlying field aberrations and requiring that the aberrations accumulated on the two passes be consistent with that model.

Conference Presentation

Citation Download Citation

Matthew D. Bergkoetter and Alden S. Jurling "Data analysis algorithm for double-pass testing of the Roman Space Telescope", Proc. SPIE 11488, Optical System Alignment, Tolerancing, and Verification XIII, 114880L (20 August 2020); https://doi.org/10.1117/12.2567347

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