Reducing the read noise of HAWAII-2RG detector systems with improved reference sampling and subtraction (IRSsup2/sup)

摘要

IRSsup2/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, IRSsup2/sup regularly interleaves reference pixels withthe normal pixels during readout. This differs from conventional clocking, in which the reference pixels are readout infrequently, and only in a few rows and columns around the outside edges of the detector array. Duringcalibration, the data are processed in Fourier space, which is close to the noise’s eigenspace. Using IRSsup2/sup, we havereduced 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 outa 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 applyingIRSsup2/sup techniques to H4RGs when the opportunity arises.© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.