The effect of sideband ratio on line intensity for Herschel/HIFI

Higgins, R., Teyssier, D., Borys, C., Braine, J., Comito, C., Delforge, B., Helmich, F., Olberg, M., Ossenkopf, V., Pearson, J. & Shipman, R., 1-Jul-2014, In : Experimental Astronomy. 37, 2, p. 433-452 20 p.

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  • The effect of sideband ratio on line intensity for Herschel-HIFI

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  • Ronan Higgins
  • David Teyssier
  • Colin Borys
  • Jonathan Braine
  • Claudia Comito
  • Bertrand Delforge
  • Frank Helmich
  • Michael Olberg
  • Volker Ossenkopf
  • John Pearson
  • Russell Shipman
The Heterodyne Instrument for the Far Infrared (HIFI) on board the Herschel Space Observatory is composed of a set of fourteen double sideband mixers. We discuss the general problem of the sideband ratio (SBR) determination and the impact of an imbalanced sideband ratio on the line calibration in double sideband heterodyne receivers. The HIFI SBR is determined from a combination of data taken during pre-launch gas cell tests and in-flight. The results and some of the calibration artefacts discovered in the gas cell test data are presented here along with some examples of how these effects appear in science data taken in orbit.
Original languageEnglish
Pages (from-to)433-452
Number of pages20
JournalExperimental Astronomy
Issue number2
Publication statusPublished - 1-Jul-2014


  • HIFI, Herschel, Heterodyne, Calibration, Sideband ratio

ID: 25752741