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:
for the WHT
Observing Program Preparation Tool: It will
be used by astronomers at their home institution to create observing sequences.
It also contains a basic instrument simulator to compute expected S/N ratios
for the different observing modes. It should facilitate access to whole
sky standard catalogues, such as POSS, 2MASS, IRSKY.
Templates Scripts Software: This system is
used to generate the LIRIS observing templates. It will have a set of predefined
observing modes or templates, each of them with a set of configurable parameters
(exposure time, reading modes, pointing offsets). This system will generate
sequence of commands which can be interpreted by the ISP.
Instrument Support Platform User Interface: This
will be the main user interface for the instrument. It would allow to interact
with the telescope control software and hopefully with the autoguider software.
LIRIS Mechanism Control Software: This system
can receive commands from the Instrument Support Platform and return status
information. It comprises the following 2 subsystems:
LIRIS EPICS Mechanism Control Software: This
system is the responsible of the direct control of the LIRIS
mechanisms (slit, filter, pupil, grism, camera wheels and detector
focus). This software will run on the VME EPICS rack.
Temperature Controller Software: This system
will be used to control and monitor the detector temperature.
Real Time Display: This system is used to
monitor the newly acquired images. It will provide some facilities as basic
image statistics, different ways of image scaling, plus a seeing and background
Quick Look Data Analysis: This system will
provide facilities for a quick analysis of the acquired data. This should
include sky subtraction, alignment of images, extraction of spectra, default
Pipeline Processing: This system will be used
ot process blocks of data. The following processing steps will be done:
sky subtraction, flat-fielding, coaddition and alignment of image, in the
spectroscopy mode the wavelength calibration will also be included.
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)
||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.
||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
||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.
||Spectroscopy of extended objects
||Telescope moves by large offsets perpendicularly
to the slit direction.
||Flat field, photometric calibrations.
REAL TIME DISPLAY
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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