SPHERE/IFS: Reference frames

SPHERE IFS reference frames

Calibrations are taken for the only IFS mode

The basic IFS optical components are stored in the following keys:

• The prism wheel INS2.OPTI2.NAME (either PRI_YJ or PRI_YJH)
• A composed key INS2.COMB.IFS.NAME which contains the setup of the imaging flats.
• The laser lamps and broad band lamps used for imaging flats are in INS2.LAMP[1-5].NAME.
• Neutral density filters aso used for imaging flats are in INS2.FILT.NAME.
  

IFS dark and background frames:

IFS dark and background frames are acquired in regular time intervals for the following setups:

• DIT=2, NDIT=40
• DIT=8, NDIT=25
• DIT=30, NDIT=15

IFS dark frames use the setup INS1.OPTI1.NAME=CLOSED, while IFS background calibration frames use INS1.OPT1.NAME=OPEN and become dependent on the dicroic of the CLI.

dark
CPI: INS4.FILT2.NAME	ND_3.5	ND_3.5	ND_3.5
dicroic CPI: INS4.OPTI13.NAME	any	any	any
detector setup DET.SEQ1.DIT_DET.NDIT	2.0_40	8.0_25	30.0_15
dark
one plane of the raw frame cube * [all are 17 MB]	DIT=2	DIT=8	DIT=30
headers	hdr	hdr	hdr
products
background YJ
CPI: INS4.FILTER2.NAME	OPEN	OPEN	OPEN
dicroic CPI: INS4.OPT13.NAME	DIC_H	DIC_H	DIC_H
detector setup DET.SEQ1.DIT_DET.NDIT	2.0_40	8.0_25	30.0_15
background YJ
one plane of the raw frame cube * [all are 17 MB]	DIT=2	DIT=8	DIT=30
headers	hdr	hdr	hdr
products
background YJH
CPI: INS4.FILTER2.NAME	OPEN	OPEN	OPEN
dicroic CPI: INS4.OPTI13.NAME	DIC_K	DIC_K	DIC_K
detector setup DET.SEQ1.DIT_DET.NDIT	2.0_40	8.0_25	30.0_15
background YJH
one plane of the raw frame cube * [all are 17 MB]	DIT=2	DIT=8	DIT=30
headers	hdr	hdr	hdr
products

 

IFS imaging flat:

IFS laser lamp and broad band halogen lamp imaging flats are acquired in regular time intervals for up to four narrow band laser lamps and one broad band halogen lamp. They all look very similar

imaging flat
imaging flat
one plane of the raw frame cube * [all are 17 MB]	any
headers	hdr
products

IFS ifu flats and ifu arc frames:

IFS ifu flats and arc frames are acquired in regular time intervals for the following setups:

• PRI_YJ
• PRI_YJH

ifu flat
prism: INS2.OPTI2.NAME	PRI_YJ	PRI_YJH
ifu flat
one plane of the raw frame cube * [all are 17 MB]	YJ	YJH
headers	hdr	hdr
products
ifu arc
prism: INS2.OPTI2.NAME	PRI_YJ	PRI_YJH
background YJ
one plane of the raw frame cube * [all are 17 MB]	YJ	YJH
headers	hdr	hdr
products