Abstract
IRS<sup>2</sup> 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<sup>2</sup> 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<sup>2</sup>, 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<sup>2</sup> techniques to H4RGs when the opportunity arises.
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