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Reducing the read noise of HAWAII-2RG detector systems with improved reference sampling and subtraction (IRS 2 )

2012; SPIE; Volume: 8453; Linguagem: Inglês

10.1117/12.926089

1996-756X

Bernard J. Rauscher, Richard G. Arendt, D. J. Fixsen, Matthew Lander, Don J. Lindler, Markus Loose, S. H. Moseley, Donna V. Wilson, Christos Xenophontos,

Astronomy and Astrophysical Research

IRS 2 is a Wiener-optimal approach to using all of the reference information that Teledyne's HAWAII-2RG (H2RG) detector array provides. Using a new readout pattern, IRS 2 regularly interleaves reference pixels with the normal pixels during readout. This differs from conventional clocking, in which the reference pixels are read out infrequently, and only in a few rows and columns around the outside edges of the detector array. During calibration, the data are processed in Fourier space, which is close to the noise's eigenspace. Using IRS 2 , we have reduced the read noise of the James Webb Space Telescope (JWST) Near Infrared Spectrograph's (NIRSpec) H2RGs by 15% compared to conventional readout. We are attempting to achieve further gains by calibrating out a recently recognized non-stationary noise component that appears at the frame rate. Teledyne's new HAWAII- 4RGs (H4RG) build in a flexible capability to interleave reference pixels. We eagerly look forward to applying IRS 2 techniques to H4RGs when the opportunity arises.