Subject: amber updates

From: cgarasi@NMSU.Edu

Submitted: Mon, 21 Aug 1995 10:32:48 -0600

Message number: 1 (previous: 0, next: 2 up: Index)

X-Sun-Data-Type: text
X-Sun-Data-Description: text
X-Sun-Data-Name: text
X-Sun-Charset: us-ascii
X-Sun-Content-Lines: 12


  My name is Christopher Garasi and I am 3rd year grad student at NMSU.
I have been consulting with the WSMR (White Sande Missle Range) engineers
concerning the AMBER IR camera to be installed sometime this November.

Below are two emails I have begun circulating concering the filters to
be used with this detector. Please feel free to email me with any questions you 
might have.

X-Sun-Data-Type: default
X-Sun-Data-Name: message1
X-Sun-Charset: us-ascii
X-Sun-Content-Lines: 35


I received word today from a White Sands engineer (John Corvo) asking 
about filters for the AMBER IR detector. Specifically, the filter wheel to 
be used in the dewer will have 5 slots (of which we will use 2). 
Below is a listing of what filters
I requested (rest lambda and range) and what they can offer to get us 
(their expense). Please note if you think the filter ranges they have given 
us are unaccepatable and why. I already have had input from Tom Harrison about
the K filter going too far into an atmospheric absorption band on the 
shortward side.

Name	Rest lambda(microns)	  Range			what WSMR can get
J		1.2		1.1  - 1.3		1.09 - 1.4 or
							1.13 - 1.43

H		1.6		1.45 - 1.75		1.45 - 1.95
K		2.2		2.0  - 2.4		1.875 - 2.4
L'		3.8		3.5  - 4.2		3.45 - 4.14 
M		4.9		4.55 - 5.25		4.66 - 5.2

Note, the L' filter is what the WSMR range people will be using for their
tests. Lucky for us it winds up being L'!

Mr.Corvo has asked me to look into these numbers and get back to him ASAP
( by this Wednesday 8/23). They are really trying to push the dewer manufacturer to supply these filters and get the instrument set up by November. 

Any input which you could give on this matter would be appreciated:

Chris Garasi 

X-Sun-Data-Type: default
X-Sun-Data-Name: message3
X-Sun-Charset: us-ascii
X-Sun-Content-Lines: 51

AMBER detector (InSb- Indium Antimonide)

Pixel Elements:		512x512
Pixel Size:		25x25 microns
Operating Temp:		78 K (Liquid Nitrogen cooled)
QE:			0.68 (Non AR coated); >80 with AR coating
Dynamic Range:		>10,000
Readout Noise:		<250 electrons
Nonlinearity:		<1.5%
Bandpass for chip:	~1 - 5.4 microns

There are no focal reducers to be used with the AMBER camera, therefore
the camera will work at F10.

using the following relation:

arcsec/pix=        pixsize/(F*D) * (180/Pi) * 3600    

F=Focal ratio, D telescope primary Diameter (meters), pixel size (meters)
one can obtain the pixel sky coverage.

	   	       GRIM		 |     AMBER
	F/5		0.41   "/pix	 |	-	
	F/10		0.235  "/pix	 |	0.147 "/pix
	F/20		0.1178 "/pix	 |	-

Note: 	The pixel size for GRIM is 40 microns as compared to 25 microns for
	AMBER. This is why the amount of sky covered per pixel is smaller. 

Comparisons of Field-of-Views is:

	   	       GRIM		 |     AMBER
	F/5		~ 2 arcminutes	 |	-	
	F/10		~ 1 arcminute	 |	~ 1.25 arcminutes
	F/20		~ 30 arcseconds  |	-

Point to remember: We are not going to get much more sky coverage with AMBER
		   even if the chip size is twice as large as GRIM simply
		   because the pixel sizes are almost 1/2 of that for GRIM.

APO APO APO APO APO  Apache Point Observatory 3.5m  APO APO APO
APO  This is message 1 in the apo35-amber archive. You can find
APO  the archive in /u/strauss/apo/mailer/apo35-amber on
APO  To join/leave the list, send mail to
APO  To post a message, mail it to