FLAMINGOS Detector Information

FLAMINGOS --- Detector Information

Rockwell PACE-1 HAWAII-2 Arrays Used by FLAMINGOS

Device

Engineering Array

Science Grade Array

Bare Mux

Date Installed

Fall 2000 through September 2002

September 2002 to present

Fall 2000

Serial Number

Det Layer ID

9-321L

n.a.

Mux ID

L3W1D3

n.a.

J-band QE

Mean QE = 0.318
Std Dev of QE = 0.164
Stddev / Mean = 0.515
Yield (number of pixels out of 2048x2048 pixels) = 0.9999
Max QE = 1.000
Min QE = 0.000

Still locating data sheets.
If it is similar to the FLAMINGOS-2 science array, then the J-band QE is probably about 0.7, with a standard deviation that is a littler tighter (about 0.13).

H-band QE

Mean QE = 0.592
Std Dev of QE = 0.067
Stddev / Mean = 0.113
Yield (number of pixels out of 2048x2048 pixels) = 0.9999
Max QE = 1.000
Min QE = 0.000

Still locating data sheets.
If it is similar to the FLAMINGOS-2 science array, then the H-band QE is probably about 0.7, with a standard deviation that is a littler tighter (about 0.13).

K-band QE

Mean QE = 0.590
Std Dev of QE = 0.065
Stddev / Mean = 0.111
Yield (number of pixels out of 2048x2048 pixels) = 0.9998
Max QE = 1.000
Min QE = 0.000

Still locating data sheets.
If it is similar to the FLAMINGOS-2 science array, then the K-band QE is probably about 0.7, with a standard deviation that is a littler tighter (about 0.13).

Crosstalk on the Science Grade Array

Our science grade array exhibits crosstalk between amplifiers. I don't remember seeing it on the engineering grade array, but that's not to say it wasn't there at a lower level.
We read out all 32 amplifiers of the array; each quadrant is read into one A/D caard containing 4 A/D inputs; the 8 amplifiers are muxed in pairs to one of the 4 A/D inputs on the card.
During July/August 2003 we did a little investigation on the nature of the crosstalk. Four images (raw CDS frames) are presented here; click on the images for a larger view; gzipped fits files are linked below.

No, we don't have any suggestions on how to deal with it in your data. I think our two survey teams have found ways to reject them when identifying sources, but you'd have to talk to one of the PIs.

A pinhole source was directed at amplifier #2, within quadrant #1.
The source signal peaked at about 21,000 ADU, the bias level is about 350 ADU.
Approximately +/-128 pixels (the width of one amplifier) away lie the crosstalk signals, in amps 1 and 3.
The crosstalk signals look like little positive and negative half-sources (~+/-150 ADU about bias level).
Some of the experiments showed that cross talk occurs when the bright source lands on an even-numbered amplifer, but not when it landed on an odd-numbered amplifier.
q1.amp2.preamp.30sec.0001.fits.gz (4.8 MB)

A zoom in on the previous image.

Same setup as in previous image, except that we disabled the opamp for channel 2 in the preamp.
The crosstalk signals are still present (at center of black circles), thus the cross talk is not a function of our preamp.
This implies to us that the cross talk occurs within the detector itself.
q1.amp2.preamp2.30sec.0005.fits.gz (4.8 MB)

Similar experiment with a square aperture landing on amplifier 28 (within quadrant 4).
bighole.10sec.0001.fits.gz (5.0 MB)

A bright slit was directed at several amps in quadrant 4. Cross talk bands appear in all other quadrants. We have seen this on the telescope with very bright sources and long-slit spectroscopy.
xtalk.5.0001.fits.gz (5.1 MB)

Crosstalk on the Science Grade Array Our science grade array exhibits crosstalk between amplifiers. I don't remember seeing it on the engineering grade array, but that's not to say it wasn't there at a lower level. We read out all 32 amplifiers of the array; each quadrant is read into one A/D caard containing 4 A/D inputs; the 8 amplifiers are muxed in pairs to one of the 4 A/D inputs on the card. During July/August 2003 we did a little investigation on the nature of the crosstalk. Four images (raw CDS frames) are presented here; click on the images for a larger view; gzipped fits files are linked below. No, we don't have any suggestions on how to deal with it in your data. I think our two survey teams have found ways to reject them when identifying sources, but you'd have to talk to one of the PIs.
A pinhole source was directed at amplifier #2, within quadrant #1. The source signal peaked at about 21,000 ADU, the bias level is about 350 ADU. Approximately +/-128 pixels (the width of one amplifier) away lie the crosstalk signals, in amps 1 and 3. The crosstalk signals look like little positive and negative half-sources (~+/-150 ADU about bias level). Some of the experiments showed that cross talk occurs when the bright source lands on an even-numbered amplifer, but not when it landed on an odd-numbered amplifier. q1.amp2.preamp.30sec.0001.fits.gz (4.8 MB)
A zoom in on the previous image.
Same setup as in previous image, except that we disabled the opamp for channel 2 in the preamp. The crosstalk signals are still present (at center of black circles), thus the cross talk is not a function of our preamp. This implies to us that the cross talk occurs within the detector itself. q1.amp2.preamp2.30sec.0005.fits.gz (4.8 MB)
Similar experiment with a square aperture landing on amplifier 28 (within quadrant 4). bighole.10sec.0001.fits.gz (5.0 MB)
A bright slit was directed at several amps in quadrant 4. Cross talk bands appear in all other quadrants. We have seen this on the telescope with very bright sources and long-slit spectroscopy. xtalk.5.0001.fits.gz (5.1 MB)

	Rockwell PACE-1 HAWAII-2 Arrays Used by FLAMINGOS
Device	Engineering Array	Science Grade Array	Bare Mux
Date Installed	Fall 2000 through September 2002	September 2002 to present	Fall 2000
Serial Number	10	43	M8
Det Layer ID		9-321L	n.a.
Mux ID		L3W1D3	n.a.
J-band QE	Mean QE = 0.318 Std Dev of QE = 0.164 Stddev / Mean = 0.515 Yield (number of pixels out of 2048x2048 pixels) = 0.9999 Max QE = 1.000 Min QE = 0.000	Still locating data sheets. If it is similar to the FLAMINGOS-2 science array, then the J-band QE is probably about 0.7, with a standard deviation that is a littler tighter (about 0.13).
H-band QE	Mean QE = 0.592 Std Dev of QE = 0.067 Stddev / Mean = 0.113 Yield (number of pixels out of 2048x2048 pixels) = 0.9999 Max QE = 1.000 Min QE = 0.000	Still locating data sheets. If it is similar to the FLAMINGOS-2 science array, then the H-band QE is probably about 0.7, with a standard deviation that is a littler tighter (about 0.13).
K-band QE	Mean QE = 0.590 Std Dev of QE = 0.065 Stddev / Mean = 0.111 Yield (number of pixels out of 2048x2048 pixels) = 0.9998 Max QE = 1.000 Min QE = 0.000	Still locating data sheets. If it is similar to the FLAMINGOS-2 science array, then the K-band QE is probably about 0.7, with a standard deviation that is a littler tighter (about 0.13).