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18
Issue 1.1
LUCIFER User Manual
Figure 6 shows a typical LUCIFER dark frame, where some known artefacts are highlighted. The two
main nasty features are a bad column at x=[783,784] for y=[1025,2048] and a bad line at y=[859,861]
over the x range of [670,1025]. As much as possible avoid putting any of your spectrum over the area.
The central line/column (1024,1024) of “dots” are some features of the DCR readmode. They nicely
disappear in difference images, however do not put an object in view of taking its spectrum perfectly
in the middle of the detector (in Y).
Figure 6: Part of a LUCIFER image, where few features (bad column/line and few bad pixel clusters)
have been highlighted.
Note: Unlike most infrared detectors, the LUCIFER detector is read only upon request = there is no
permanent reads on-going.
3.3
Calibration Unit
This unit can be moved in front of the entrance window. Three arc lamps (Neon, Argon and Xenon)
are available for wavelength calibration and three halogen lamps for flat fields.
Note that moving the calibration unit in front of LUCIFER obstructs the light coming from the
telescope, thus guiding will not be able to continue while internal calibrations are being taken over
night. In this case, ask the telescope operator to pause guiding and active optics corrections for you,
before the calibration unit is moved in the light path.