EFOSC2 

ESO Faint Object Spectrograph and Camera
 
 
  
Imaging Science Modes

Simple Imaging
Jittered Imaging
Coronographic Imaging
Polarimetric Imaging

The 4 science imaging modes are described below. The observer is also referred to the pages on Acquisition images and Miscellaneous information.

Simple Imaging

In this mode one can obtain one or more images of a field through broad and/or narrow band filters.

The following acquisition templates may be used in this mode:

A sample jP2PP observing block

The above example shows an OB comprising a sequence of:

The FITS file is called EFOSC_Image.#.fits

Parameter Values One does not have to (in fact, should not) change the value of any parameter other than :

Jittered Imaging

This is very similar to Simple Imaging  except for the folowing difference :

A sample jP2PP observing block (the OB has been erroneously named Coronographic imaging)

The above example shows an OB comprising a sequence of

The FITS file is called  EFOSC_ImaJit.#.fits

Parameter Values   In addition to the parameters listed under Simple Imaging the following may need to be changed :

Coronographic Imaging

The Coronographic mode is very similar to the Simple ImagingMode  except for the following differences :

A sample jP2PP observing block The FITS file is called  EFOSC_ImaCor.#.fits

Parameter Values  see under simple imaging

Polarimetric Imaging

The acquisition template to be used is  Img_Acq_Pol.

The imaging is similar to  Simple Imaging except for the following additional features :

Refer to Polarisation optics.

IMPORTANT When the half wave plate (HWP) is set to continuous rotation in a template the counter ends up with 360xN degrees. When a signal is sent to set the HWP to some small fixed value (say, 45 degrees)  it tries to undo all the N rotations and in doing so triggers a time-out error. So we have included a command at the end of every Polarimetry template to initialise the HWP if it was set into continuous rotation mode - this just takes a few seconds. However when such a template is aborted, for whatever reason, this initialisation does not take place. The only solution is to cold-start the EFOSC2 instrument which takes about 1-2 minutes. So avoid aborting a Polarimetry template - use the STOP option instead.

A sample jP2PP observing block

The above example shows an OB comprising a sequence of:

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Last modified: Mon Jan 14 20:56:59 CLST 2002 

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