Quality Control and Data Processing

FITS key QC1 database: table, name definition class* HC_plot** more docu

QC.DARK.MED hawki_dark..qc_dark_med median value across master dark HC [docuSys coming]

*Class: KPI - instrument performance; HC - instrument health; CAL - calibration quality; ENG - engineering parameter
**There might be more than one.

Scoring&thresholds DARK median

The dark level of the master dark in each of the 4 detectors is monitored.

The dark_median in each detector is scored individually, with dynamic thresholds following the median average of the current period. The only requirement on the dark current is stability on the calibration timescale.

Date event

2014-02-01 Bright darks on Feb 01 due to high detector temperature. Instrumentation worked on it and problem was fixed.

Algorithm DARK median

A list of dark frames (at least 5 input frames, usually 10) is combined into a mean dark product. The mean value is estimated across the whole detector for each chip separately.

DARK ron

DARK median | DARK ron | DARK reset anomaly | DARK ron vs. DIT

FITS key QC1 database: table, name definition class* HC_plot** more docu

QC.RON2 hawki_dark..qc_ron23 ReadOut Noise from (second-third) RAW frames HC [docuSys coming]

*Class: KPI - instrument performance; HC - instrument health; CAL - calibration quality; ENG - engineering parameter
**There might be more than one.

Scoring&thresholds DARK ron

The read-out-noise estimated from the pair of the 2nd and 3rd exposure is monitored for each of the 4 detectors. Only the 2.0 and 300 second DIT calibration frames are used.

The read-out-noise in each detector is scored individually, with dynamic thresholds following the median average of the current period. The only requirement on the dark current is stability on the calibration timescale.

Date event

2016-11-19 new, re-designed CASU pipeline was adopted in the QC system

Algorithm DARK ron

A list of dark frames (at least 5 input frames, usually 10) is combined into a mean dark product. Read-out-noise is estimated from each pair of the input frames.

DARK reset anomaly

DARK median | DARK ron | DARK reset anomaly | DARK ron vs. DIT

The Reset Anomoly is a feature of certain detectors whereby after the detector reset there is a period of time during which the rate of dark current accumulation varies before settling into a (more or less) constant rate of accumulation, e.g. as seen in ISAAC.

Based on long term trending it looks like HAWK-I does NOT suffer from a Reset Anomoly.

Scoring&thresholds DARK reset anomaly

The dark median values are trended as a function of data integration time (DIT).

No scoring

Algorithm DARK reset anomaly

Date event

2016-11-19 new, re-designed CASU pipeline was adopted in the QC system

No algorithm applied

DARK ron vs. DIT

DARK median | DARK ron | DARK reset anomaly | DARK ron vs. DIT

Scoring&thresholds DARK ron vs. DIT

This correlation plot monitors for any correllation between read-out-noise (RON) and data integration time (DIT).

No scoring