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CRIRES trending system: HISTORY report
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Last update: 2013-01-13T03:47:13 (UT)
same group: badpix   linearity
close window history: 2009 2010 2011 2012 2013 2014   HEALTH FULL
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*Date on this monitor changes at 21:00 UT
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Plot
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Symb
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Source
*
Average ? Thresholds ? N_
data
QC1
parameter
Data
downloads
Remarks
method value unit method value
1 QC1DB MEDIAN 0.0419 NONE none  9 lineff this | last_yr | all effective non-linearity at 6000ADU, chip 1
2 QC1DB MEDIAN 0.0479 NONE none  9 lineff this | last_yr | all effective non-linearity at 6000ADU, chip 2
3 QC1DB MEDIAN 0.0485 NONE none  9 lineff this | last_yr | all effective non-linearity at 6000ADU, chip 3
4 QC1DB MEDIAN 0.0445 NONE none  9 lineff this | last_yr | all effective non-linearity at 6000ADU, chip 4
5 QC1DB MEDIAN 9593 ADU VAL6000,12000 9 counts_max this | last_yr | all maximimum exposure level, chip 1
6 QC1DB MEDIAN 10938 ADU VAL6000,12000 9 counts_max this | last_yr | all maximimum exposure level, chip 2
7 QC1DB MEDIAN 10107 ADU VAL6000,12000 9 counts_max this | last_yr | all maximimum exposure level, chip 3
8 QC1DB MEDIAN 10417 ADU VAL6000,12000 9 counts_max this | last_yr | all maximimum exposure level, chip 4
*Data sources: QC1DB: QC1 database; LOCAL: local text file
Plot 1
data source:crires_detmon
(QC1 database)
dataset:lineff
median:0.0419NONE
thresholds:none 
N_data plotted:9
[click on plot for closeup]
Plot 2
data source:crires_detmon
(QC1 database)
dataset:lineff
median:0.0479NONE
thresholds:none 
N_data plotted:9
[click on plot for closeup]
Plot 3
data source:crires_detmon
(QC1 database)
dataset:lineff
median:0.0485NONE
thresholds:none 
N_data plotted:9
[click on plot for closeup]
Plot 4
data source:crires_detmon
(QC1 database)
dataset:lineff
median:0.0445NONE
thresholds:none 
N_data plotted:9
[click on plot for closeup]
Plot 5
data source:crires_detmon
(QC1 database)
dataset:counts_max
median:9593ADU
fixed thresholds:6000...12000ADU
N_data plotted:9
[click on plot for closeup]
Plot 6
data source:crires_detmon
(QC1 database)
dataset:counts_max
median:10938ADU
fixed thresholds:6000...12000ADU
N_data plotted:9
[click on plot for closeup]
Plot 7
data source:crires_detmon
(QC1 database)
dataset:counts_max
median:10107ADU
fixed thresholds:6000...12000ADU
N_data plotted:9
[click on plot for closeup]
Plot 8
data source:crires_detmon
(QC1 database)
dataset:counts_max
median:10417ADU
fixed thresholds:6000...12000ADU
N_data plotted:9
[click on plot for closeup]
This plot

Trending plot for non-linearity measurements of the CRIRES detector.

Data are taken from detector monitoring calibrations which are series of flat fields with increasing DITs and corresponding darks. A second order polynomial is fit to the data (flux vs. exposure time for each pixel). The trending shows the average effective non-linearity at 6000 ADU and the maximum exposure level (in ADU) from the frame with the highest DIT. Effective non-linearity is the difference between the flux predicted at 6000 ADU by the linear term and the flux obtained from the polynomial, normalized by the polynomial flux.

The average effective non-linearity should be less than 0.1. In order to correctly calculate this parameter, the maximum flux should be above 6000 ADU on all detectors. It should also be below 12000 ADU because the CRIRES array becomes highly non-linear above.  


General information

Click on any of the plots to see a close-up version. The latest date is indicated on top of the plot, data points belonging to that date are specially marked.

If configured,

  • statistical averages are indicated by a solid line, and thresholds by broken lines
  • outliers are marked by a red asterisk. They are defined as data points outside the threshold lines
  • "aliens" (= data points outside the plot Y limits) are marked by a red arrow ( or )
  • you can download the data for each parameter set if the 'Data downloads' link shows up