ING Banner
Home > Astronomy > LIRIS > Cookbook - Chapter 3

The LIRIS users guide
  1. Starting the system
  2. LIRIS real time display (RTD)
  3. LIRIS mechanisms
  4. Focusing
  5. LIRIS observing commands
  6. End of night
  7. Copying data
  8. Important notes

3. LIRIS mechanisms

LIRIS mechanisms comprises a slit mask wheel, two filter wheels, a pupil stop wheel and a grism wheel. A pupil imager for engineering purposes is present, too.

Current configuration of the LIRIS wheels
Predefined LIRIS observing modes

Status of LIRIS mechanisms

The position of all internal LIRIS wheels can be checked in two ways:

TO> lwheelconfig
brings up a detailed configuration list of the instrument.

TO> lmchstat
shows the following status display, which will be automatically updated:

Moving LIRIS mechanisms

Mechanisms can be moved independently of each other by using the command line interface (pink window). 
Note however that for normal imaging operation you should use the limage command for selecing filters, which uses a predefined instrument configuration with an optimised pupil selection for lowest backgrounds.

  • Filters are selected with
    TO> lfwheel1 <filter name | number>
    TO> lfwheel2 <filter name | number>
  • Slit masks are selected with
    TO> lslit <slit name | number>
  • Grisms are selected with:
    TO> lgrism <grism name | number>
  • Pupil stops are selected with:
    TO> lpupil <pupil name | number>
  • Pupil imager. Only used in engineering mode. In normal astronomical use the pupil imager position must be out of the light beam. Call your support astronomer or duty engineer to take the pupil imager out if necessary.

The names or numbers of the corresponding filters, slits etc. can be found at the current LIRIS configuration page.

Resetting LIRIS mechanisms

If you have for any reason to reset one of the LIRIS mechanisms, then you can achieve this with the following command: 

TO> lsethome [slit | fwheel1 | fwheel2 | grism | pupil | all]

Previous: 2. LIRIS real time display (RTD)
Next:       4. Focusing

Top | Back

Contact:  (LIRIS Instrument Specialist)
Last modified: 28 July 2011