Long-slit Intermediate Resolution Infrared Spectrograph for the WHT
 The instrument control will be carried out by several software subsystems. A main user interface with the instrument support platform (ISP), which  provides the means for controlling all LIRIS subsystems. The following subsystems will be accessible:


There is a plan to provide a set of templates to facilitate the observation. These templates should be sufficient to cover most of cases.
LIRIS Observing Templates (LOT)
Obs_img_Dither Imaging of point sources or uncrowded fields  There is no need to take separate sky observations. The telescope offsets automatically (dithering) or using a list of specified positions within a box smaller than the camera field of view.
Obs_img_Boff Imaging of extended sources or crowded fields Sky observations have to be taken separately. The sky positions can be randomly chosen or from a list. Object positions can be selected as in template Obs_img_Jitter
Obs_spec_Nod Spectroscopy of point or compact objects Telescope moves between two positions along the slit for a number of cycles. The two positions can be fixed (beam-switching) or including random offsets around them. 
Obs_spec_Boff Spectroscopy of extended objects Telescope moves by large offsets perpendicularly to the slit direction.
Obs_img_Polarimetry Imaging polarimetry  
Obs_spec_Polarimetry Spectropolarimetry  
Obs_cal_Gen Calibration sequences Flat field, photometric calibrations.


The Real Time display is used to monitor the image adquisition. It is based on a graphical interface which allows to control the way of  displaying  images (scaling, sky subtraction) and show basic statistics. The images are displayed using existing facilities such as Ximtool or SAOtng.

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Last modified: 08/03/02

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