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Optical Engineering

Noise properties and signal-dependent interpixel crosstalk of the detectors of the Near-Infrared Spectrograph of the James Webb Space Telescope
Author(s): Giovanna Giardino; Marco Sirianni; Stephan M. Birkmann; Bernard J. Rauscher; Don J. Lindler; Torsten Böker; Pierre Ferruit; Guido De Marchi; Martin Stuhlinger; Peter L. Jensen; Paolo Strada
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Paper Abstract

The Near-Infrared Spectrograph (NIRSpec) is one of the four science instruments of the James Webb Space Telescope. Its focal plane consists of two HAWAII-2RG sensors operating in the wavelength range of 0.6 to 5.0 µm and, as part of characterizing NIRSpec, the noise properties of these detectors under dark and illuminated conditions were studied. Under dark conditions, and as already known, 1/f noise in the detector system causes somewhat higher noise levels than can be accounted for by a simple model that includes white read noise and shot noise on integrated charge. More surprisingly, for high levels of accumulated charge, significantly lower total noise than expected was observed. This effect is shown to be due to pixel-to-pixel correlations introduced by signal-dependent interpixel crosstalk, with an interpixel coupling factor, α , that ranges from ∼0.01 for zero signal to ∼0.03 close to saturation.

Paper Details

Date Published: 6 March 2013
PDF: 9 pages
Opt. Eng. 52(3) 034001 doi: 10.1117/1.OE.52.3.034001
Published in: Optical Engineering Volume 52, Issue 3
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 J. Lindler, NASA Goddard Space Flight Ctr. (United States)
Torsten Böker, 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 L. Jensen, European Space Research and Technology Ctr. (Netherlands)
Paolo Strada, European Space Research and Technology Ctr. (Netherlands)


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