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Proceedings Paper

Principal components analysis of a JWST NIRSpec detector subsystem
Author(s): Bernard J. Rauscher; Richard G. Arendt; D. J. Fixsen; Matthew A. Greenhouse; Matthew Lander; Don Lindler; Markus Loose; S. H. Moseley; D. Brent Mott; Yiting Wen; Donna V. Wilson; Christos Xenophontos
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Paper Abstract

We present principal component analysis (PCA) of a flight-representative James Webb Space Telescope Near Infrared Spectrograph (NIRSpec) Detector Subsystem. Although our results are specific to NIRSpec and its T ~ 40 K SIDECAR ASICs and 5 μm cutoff H2RG detector arrays, the underlying technical approach is more general. We describe how we measured the system’s response to small environmental perturbations by modulating a set of bias voltages and temperature. We used this information to compute the system’s principal noise components. Together with information from the astronomical scene, we show how the zeroth principal component can be used to calibrate out the effects of small thermal and electrical instabilities to produce cosmetically cleaner images with significantly less correlated noise. Alternatively, if one were designing a new instrument, one could use PCA to determine a set of environmental requirements (temperature stability, electrical stability, etc.) that enabled the planned instrument to meet performance requirements.

Paper Details

Date Published: 26 September 2013
PDF: 8 pages
Proc. SPIE 8860, UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts VI, 886005 (26 September 2013); doi: 10.1117/12.2025053
Show Author Affiliations
Bernard J. Rauscher, NASA Goddard Space Flight Ctr. (United States)
Richard G. Arendt, CRESST/UMBC/GSFC (United States)
D. J. Fixsen, CRESST/UMd/GSFC (United States)
Matthew A. Greenhouse, NASA Goddard Space Flight Ctr. (United States)
Matthew Lander, Raytheon/GSFC (United States)
Don Lindler, Sigma Space Corp./GSFC (United States)
Markus Loose, Markury Scientific, Inc. (United States)
S. H. Moseley, NASA Goddard Space Flight Ctr. (United States)
D. Brent Mott, NASA Goddard Space Flight Ctr. (United States)
Yiting Wen, NASA Goddard Space Flight Ctr. (United States)
Donna V. Wilson, NASA Goddard Space Flight Ctr. (United States)
Christos Xenophontos, NASA Goddard Space Flight Ctr. (United States)


Published in SPIE Proceedings Vol. 8860:
UV/Optical/IR Space Telescopes and Instruments: Innovative Technologies and Concepts VI
Howard A. MacEwen; James B. Breckinridge, Editor(s)

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