KMOS: Dark
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HC PLOTS |
Dark level |
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RON |
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Bad pixels |
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QC1 database (advanced users):
browse |
plot
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Dark exposures are measured during daytime for DIT = 60 secs. Darks with other DIT values are only measured
by special request from a SM or VM user. There are typically five frames for each DIT value.
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DARK frame. Example frame for detector #1.
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DARK level
The master dark is the median stack of the (typically) five input raw dark frames.
QC1_parameters
FITS key |
QC1 database: table, name |
definition |
class* |
HC_plot** |
more docu |
QC.DARK.MEDIAN | kmos_dark..dark_median | median dark level of input frames [ADU] | HC | | [docuSys coming] |
*Class: KPI - instrument performance; HC - instrument health; CAL - calibration quality; ENG - engineering parameter
**There might be more than one. |
Trending
The QC1 parameters for darks are trended for a DIT value of 60 secs. The full
plot includes also data points from darks with DIT=600s. The latter have been
measured only until May 2016.
Scoring&thresholds DARK level
Thresholds have been set empirically to +5 / -5 ADUs for DIT=60s. Values above
the upper limit typically indicate the presence of remnants from previous
exposures.
History
Until May 2016, darks have been measured with DITs that match the DITs used
for science observations during the night. After that, only darks with DIT=60s
are taken regularly. Their only purpose in the data reduction chain is to provide an
initial guess of the bad pixel map.
Algorithm DARK level
The median level of each input raw frame is determined; the QC parameter is the average of the all values.
Read-out noise
QC1_parameters
FITS key |
QC1 database: table, name |
definition |
class* |
HC_plot** |
more docu |
QC.RON.MEDIAN | kmos_dark..ron_median | median ron of master dark [ADU] | HC | | [docuSys coming] |
*Class: KPI - instrument performance; HC - instrument health; CAL - calibration quality; ENG - engineering parameter
**There might be more than one. |
Trending
The QC1 parameters for darks are trended for a DIT value of 60 secs.
Scoring&thresholds Read-out noise
Scoring thresholds have been set empirically.
History
Until May 2016, darks have been measured with DITs that match the DITs used
for science observations during the night. After that, only darks with DIT=60s
are taken regularly. Their only purpose in the data reduction chain is to provide an
initial guess of the bad pixel map.
Algorithm Read-out noise
Pipeline recipe.
DARK bad pixels
QC1_parameters
FITS key |
QC1 database: table, name |
definition |
class* |
HC_plot** |
more docu |
QC.BADPIX.NCOUNTS | kmos_dark..badpix | number of bad pixels | HC | | [docuSys coming] |
*Class: KPI - instrument performance; HC - instrument health; CAL - calibration quality; ENG - engineering parameter
**There might be more than one. |
Trending
The QC1 parameters for darks are trended for a DIT value of 60 secs.
Scoring&thresholds DARK bad pixels
Scoring thresholds have been set empirically.
History
Until May 2016, darks have been measured with DITs that match the DITs used
for science observations during the night. After that, only darks with DIT=60s
are taken regularly. Their only purpose in the data reduction chain is to
provide an
initial guess of the bad pixel map.
Algorithm DARK bad pixels
Bad pixels are those pixels in the master dark that have values outside
defined thresholds. The default thresholds are +/- 50 ADU.
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