.. index:: PRNU / small-scale flat (VIS) .. _calobs-vis-prnu: **CALPRODUCT-VS-014:** VIS LED Pixel Response Non-uniformity (PRNU) =================================================================== .. include:: definitions.rst Parent requirement ------------------ | `R-CAL-B-VS-1200 `_ | `R-CAL-B-VS-2200 `_ | `R-CAL-B-VS-4210 `_ Scheduling ---------- Once, during PV phase, and on a regular basis during the ROS. Time-critical ------------- No Objective --------- For each LED wavelength, obtain the zero-signal PRNU, i.e. corrected for contrast reduction due to :ref:`calobs-vis-bfe`. This can be achieved by extrapolation to zero signal, and / or BFE correction. Flag cold/dead pixels, as well as hot pixels. Fulfilled by ------------ :ref:`calobs-block-pv-vis-prnu-bfe` :ref:`calobs-block-pv-vis-ptc-cti-eper` (also) :ref:`calobs-block-f-wide-survey` Data volume ----------- Data Volume under study; compression ratio varies by a large factor depending on the fluence. Processing input ---------------- :command:`Ground Processing Input Data`: BPM, ground-based QE :command:`Data Description`: Flat-field and QE cubes Processing output ----------------- Effective flat fields for each LED. Trend analysis Required accuracy, constraints ------------------------------ Expected flux levels within TBD%, stable within TBD%, spatial irradiance as expected (within requirement, ground-based measurements) Processing tools ---------------- OU-VIS LED PRNU Processing Element Quality control parameters -------------------------- DataModel: ``_ Contact person -------------- VIS instrument scientist .. raw:: latex \clearpage