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Polarimetry with ALFOSC


NEW! Since April 2012 the Calcite mounting is back to default orientation, i.e. the two components are split horizontally on the CCD. The intermediate solution of rotating the Calcite to reduce overheads was at work from Nov 2008 until Apr 2012. With the new controller there is no need to produce horizontal spectra to save readout time. See the polarimetry instrument setup page for details.

Observing Instructions and Tools

  • ALFOSC Cookbook - Polarimetry

  • Linear polarimetry with "Wedged DoubleWollaston" (WeDoWo) prism (starting April 1, 2010)

  • How to do linear polarimetry with FAPOL (imaging and spectroscopy)
  • How to do circular polarimetry with FAPOL (imaging and spectroscopy)
  • How to do linear imaging polarimetry with polaroids
  • How to do simultaneous linear and circular polarimetry (to be tested)

  • Linear polarimetry quick look tool
  • Circular polarimetry quick look tool

  • Zero polarisation standards
  • High polarisation standards

    See the official sequencer script page for more helpfull information about the sequencer and scripting.

    Preparing Observations and Data Reduction

  • Available instrument setups

  • Choosing filters for polarimetry and spectropolarimetry

  • How to estimate S/N for ALFOSC polarimetry

  • Wavelength dependent position angle correction

  • ALFOSC linear polarimetry accuracy using FAPOL

  • FAPOL calcite with dust, a test "the influence of dirt on the calcite on the polarization measurements"

  • WeDoWo accuracy and calibrations

  • Overheads at the NOT


    Usefull stuff

  • Useful reference publications
  • Commissioning report
  • Practical information about calcites, polaroids....



  • Instrument setup (staff only!)

  • WeDoWo staff page

  • Back to top Last modified: 19-May-2014