wiki:docs/CommissioningPlan/SDC2

SDC2 Instrument flat field, detector linearity and bad pixels

  • Phase : 1
  • Status : COMPLETE
  • Category : Daytime calibration (C3)
  • Recurrence : every day, with setup on request.
  • Duration : 20 minutes per configuration (this duration is valid only during regular operations, i.e., after commissioning)

Description

  • Instrument flat field, detector linearity, and bad pixels.

Prerequisites

Procedure

  • Use the calibration flat-field source.
  • This calibration is performed illuminating the detector uniformly using the instrument FF lamp, for each filter.
  • It is expected that the detector FF depends on filters, the final accumulated charge in the pixels. Thus, a series of exposures will be taken at different count levels (realized via ND filters and/or DIT) for each filter setup. In this case, the template takes the background frames automatically. Comparing different count rates at constant DIT will also yield a linearity map of the detector.

Templates

  • SHARKNIR_gen_cal_InstrumentFlatField

Success criteria

  • 95% luminous uniformity at a large scale.
  • 99% luminous uniformity at pixel-to-pixel scale 10-2.
  • Large scales filtered out, only a small detector scale will remain. Effect of the large-scale flat field on DBI (rescaling in flux & wavelength) has negligible impact on DBI performances.

Notes

  • Same as activity 7.9 in AD4

LBTO support

Date performed and by whom

Last modified 15 months ago Last modified on 10/12/23 11:13:24