INGRID detector history

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INGRID array history

Basic parameters
Darks and hot pixels

Basic parameters

April 2008

Gain	4.1-4.3 e^-/ADU
Readnoise	20-25 e^-
Full-well capacity
Pixel scale	0.04 "/pix
Readout time	0.76s

February 2004

Gain	3.9-4.1 e^-/ADU
Readnoise	18-24 e^-
Full-well capacity
Pixel scale	0.04 "/pix
Readout time	0.76s

March 2001-August 2001

Gain	5.3 e^-/ADU
Readnoise	26-45 e^-
Full-well capacity	22000 ADU
Pixel scale	0.238 "/pix
Readout time	0.864s (timing error corrected)

May 2000-February 2001

Gain	5.3-6.4 e^-/ADU
Readnoise	37-65 e^-
Full-well capacity	28000 ADU
Pixel scale	0.242 "/pix (with old foreoptics)
Readout time	0.896s (timing error corrected)

Darks and hot pixels

This section contains darks and hot pixel masks for the INGRID array, which are representative of each period between cool downs or software/electronic changes. The darks and hot pixel masks contained here are not intended to be used by the observers. Each observer should create their own darks during the observing run and generate his/her own pixel mask from the data. This section is intended to record useful data for the INGRID team.

date: 16-June-2005 (after warming up in February 05 and cooling down in June 05); INGRID @ GRACE Nasymth
array temperature: 80.5 K
readout noise (post-pre): 5.0 adu (~20 electrons)
number of hot pixels (in 10s): 6550 (0.62%). Per quadrants: 0.31%, 0.32%, 0.93% and 0.93% of the pixels are hot in quadrants left-up, right-up, right-down and left-down respectively


Dark 10s (r752386pp.fits) FITS file (gzipped, 1.0Mb)	Hot pixel mask FITS file (gzipped, 25.8Kb)

date: 03-Feb-2005 (monitoring); INGRID @ GRACE Nasymth
array temperature: 79.0 K
readout noise (post-pre): 5.5 adu (~22 electrons)
number of hot pixels (in 10s): 7989 (0.76%). Per quadrants: 0.54%, 0.50%, 1.02% and 0.98% of the pixels are hot in quadrants left-up, right-up, right-down and left-down respectively


Dark 10s (r719899pp.fits) FITS file (gzipped, 1.0Mb)	Hot pixel mask FITS file (gzipped, 25.8Kb)

date: 27-Mar-2003 (after the accidental (not complete) warm--up of INGRID); INGRID @ Cass, CCC off -- only LN2 but 2 cans
array temperature: 79.0 K
readout noise (post-pre): 8 adu (~32 electrons)
number of hot pixels (in 10s): 7617 (0.73%). Per quadrants: 0.35%, 0.36%, 1.1% and 1.1% of the pixels are hot in quadrants left-up, right-up, right-down and left-down respectively


Dark 10s (r585921pp.fits) FITS file (gzipped, 1.0Mb)	Hot pixel mask FITS file (gzipped, 23.6Kb)

date: 6-Feb-2003 (after warming up and cooling down the 30th January 2003, to install the new LN2 can); INGRID @ Cass, CCC off -- only LN2 but 2 cans
array temperature: 80.2 K
readout noise (post-pre): 5.2 adu (~21 electrons)
number of hot pixels (in 9.8s): 8006 (0.76%). Per quadrants: 0.50%, 0.47%, 1.07% and 1.01% of the pixels are hot in quadrants left-up, right-up, right-down and left-down respectively


Dark 10s (r571365pp.fits) FITS file (gzipped, 1.0Mb)	Hot pixel mask FITS file (gzipped, 25.5Kb)

date: 17-May-2002 (after cooling down on the 21st March 2002); INGRID @ Ghrill but CCC working
array temperature: 71.8 K
readout noise (post-pre): 5.1 adu (~20 electrons)
number of hot pixels (in 9.8s): 3961 (0.38%). Per quadrants: 0.19%, 0.21%, 0.57%, and 0.54% of the pixels are hot in quadrants left-up, right-up, right-down and left-down respectively


Dark 9.8s (r494937pp.fits) FITS file (gzipped, 1.0Mb)	Hot pixel mask FITS file (gzipped, 17.1Kb)

date: 5-Sept-2001 (just after the change to UltraDas)
array temperature: not recorded
readout noise (post-pre): 4.9 adu (~19 electrons)
number of hot pixels (in 10s): 6094 (0.6%). Per quadrants: 0.47%, 0.37%, 0.79% and 0.69% of the pixels are hot in quadrants left-up, right-up, right-down and left-down respectively


Dark 10s (r445647pp.fits) FITS file (gzipped, 1.0Mb)	Hot pixel mask FITS file (gzipped, 21.6Kb)

date: 2-May-2001
array temperature: 71.4 K
readout noise (post-pre): 5.7 adu (~30 electrons)
number of hot pixels (in 10.86s): 5014 (0.48%). Per quadrants: 0.63%, 0.67%, 0.31%, and 0.29% of the pixels are hot in quadrants left-up, right-up, right-down and left-down respectively. Note the feature in this dark image of 2-May-2001, which is not always easily seen.

NB: There is a rotation of 180 deg in the images taken before Ultradas (i.e. before 1st Sept 2002) with respect to the images taken after that date.)


Dark 10s (r414993pp.fits) FITS file (gzipped, 3.0Mb)	Hot pixel mask FITS file (gzipped, 18.1Kb)

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Last Updated: 19 April 2008
Ian Skillen, wji@ing.iac.es