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William Herschel Telescope

CIRPASS: The Cambridge Infrared PAnoramic Survey Spectrograph

First light: 26 December 2003.

Designed and built by: Institute of Astronomy, University of Cambridge.

Description: CIRPASS is a near-infrared (0.9 - 1.8 microns) fibre-fed spectrograph. Two fibre feeds exist: a 490 element integral field unit (IFU) and a 150 fibre multi-object bundle. The large spectrograph is operated inside a freezer working at -40 degrees celsius. The spectrograph camera, the filters and the detector are inside a dewar which is cooled by liquid nitrogen. The optics deliver a high resolution (R>3000) spectrum on to a mirror surface which is then reimaged on to the detector. This provides the option to block out, or suppress, the bright OH emission by making the mirror (or mask) non-reflective at the positions of the OH lines.




Scientific and technical impact:

Scientific highlights (1)

Publications (ING count: 2)


Photo archive (3)

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Last modified: 27 April 2021