The Coude Echelle Spectrometer

Details The Coude Echelle Spectrometer The Coude Echelle Spectrometer

Dec 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977msngr..11...22.&link_type=abstract

The Messenger, vol. 11, p. 22-23

Physics

Optics

Scientific paper

The coude echelle spectrometer of the ESO 3.6 m telescope is designed to reach a very high resolution (typically higher than 100,000) with a good photometric accuracy. The spectrometer will work in two possible modes. The first is a scanning mode where an alternatively rotatable echelle 200 x 400 mm moves the spectrum with regard to a fixed slit, the photon flux being detected by a high quantum efficiency cooled photomultiplier. In order to get a higher accuracy, the beam passes, in fact, twice on the grating. The dispersion is doubled and the beam focused on an intermediate slit, the instrumental profile, i. e. the system response to a perfect spectral line being made as pure as possible. Any wings and ghosts given by the grating or the optics are removed.

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