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Proceedings Paper

NIRSpec detectors: noise properties and the effect of signal dependent inter-pixel crosstalk
Author(s): Giovanna Giardino; Marco Sirianni; Stephan M. Birkmann; Bernard J. Rauscher; Don Lindler; Torsten Boeker; Pierre Ferruit; Guido De Marchi; Martin Stuhlinger; Peter Jensen; Paolo Strada
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Paper Abstract

NIRSpec (Near Infrared Spectrograph) is one of the four science instruments of the James Webb Space Telescope (JWST) and its focal plane consists of two HAWAII-2RG sensors operating in the wavelength range 0.6−5.0μm. As part of characterizing NIRSpec, we studied the noise properties of these detectors under dark and illuminated conditions. Under dark conditions, and as already known, 1/f noise in the detector system produces somewhat more noise than can be accounted for by a simple model that includes white read noise and shot noise on integrated charge. More surprisingly, at high flux, we observe significantly lower total noise levels than expected. We show this effect to be due to pixel-to-pixel correlations introduced by signal dependent inter-pixel crosstalk, with an inter-pixel coupling factor, α, that ranges from ~ 0.01 for zero signal to ~ 0.03 close to saturation.

Paper Details

Date Published: 25 September 2012
PDF: 10 pages
Proc. SPIE 8453, High Energy, Optical, and Infrared Detectors for Astronomy V, 84531T (25 September 2012); doi: 10.1117/12.925357
Show Author Affiliations
Giovanna Giardino, European Space Research and Technology Ctr. (Netherlands)
Marco Sirianni, European Space Research and Technology Ctr. (Netherlands)
Stephan M. Birkmann, European Space Research and Technology Ctr. (Netherlands)
Bernard J. Rauscher, NASA Goddard Space Flight Ctr. (United States)
Don Lindler, NASA Goddard Space Flight Ctr. (United States)
Torsten Boeker, European Space Research and Technology Ctr. (Netherlands)
Pierre Ferruit, European Space Research and Technology Ctr. (Netherlands)
Guido De Marchi, European Space Research and Technology Ctr. (Netherlands)
Martin Stuhlinger, European Space Astronomy Ctr. (Spain)
Peter Jensen, European Space Astronomy Ctr. (Spain)
Paolo Strada, European Space Astronomy Ctr. (Spain)


Published in SPIE Proceedings Vol. 8453:
High Energy, Optical, and Infrared Detectors for Astronomy V
Andrew D. Holland; James W. Beletic, Editor(s)

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