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Revision 702014-07-03 - CarolynMcCoey

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META TOPICPARENT name="WebHome"

HIFI instrument and calibration web pages

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  NEW NEW NEW Latest updates -- 2 July 2014 NEW NEW NEW
  • HIPE 12.1 has been released !
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  • A revision of the HIFI beam analysis and efficiencies is available - see the "HIFI performance and calibration" section
 
  • A new task for Electrical Standing Wave correction is available from HIPE 12.0 - see the "Outstanding calibration issues" section

Observing with HIFI

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  • Intensity calibration: Intensity Calibration Framework document
  • Side band ratio
    • Side band ratio technical note: This note describes the general calibration problem associated with the side-band gain imbalance existing in double-side-band heterodyne systems such as HIFI, and provides some recipes and calibration tables applicable to the particular case of the HIFI mixers.
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  • Beam calibration ( see also HIFI beam sub-section thereafter )
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  • Beam calibration
 
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  • WBS accuracy: COMB algorithm and interpolation interval
  • WBS resolution: optical alignment & thermal expansion effects within spectrometer
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HIFI beams

 
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HIFI beam coupling efficiencies

A revision of the HIFI beam analysis has been performed, based on a multi-epoch set of measurements on Mars. As a result, a more accurate description of the HIFI beams has been obtained, leading to some change in the beam coupling efficiencies. The details of the analysis and the revised coupling efficiencies are given in this note. For the record, the first release of the HIFI beam efficiencies was described in this document (17 Nov 2010). Please note that these updates will only be featured in the HIFI calibration tree in HIPE 13.0.

HIFI beam maps and Encircled Energy Function

In addition to this, a detailed description of the HIFI beam models is provided as 2-D beam maps, 1-D azimuthal beam averages, and 1-D azimuthally averaged Encircled Energy Functions (EEF). Each are provided at one frequency per mixer band and can be extrapolated (within the LO frequencies of a given band) as function of wavelength.

  • EEF plots as ascii and PNG files (one per mixer band and polarization - 14 in total).
  • 1-D beam model profiles as FITS files (one per mixer band and polarization - 14 in total).
  • 2-D beam model maps as FITS files (200x200 pixels, one per mixer band and polarization - 14 in total).
 

Access to the calibration tree:

  • Information about what calibration is found in the HIFI ObservationContext is found in the Data Primer of the HIFI Data Reduction Guide
 
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