I noticed the lack of such an article - and the request for one - but don't know enough about the technical aspects of this type of instrument to add much detail. Sojourner001 14:44, 20 January 2007 (UTC)
I'm affraid that the drawing in this article is incorrect (or, at least its description is wrong). The first dispersive element in the echelle spectrograph should be echelle grating (*not* standard grating), and the second one should be cross-disperser (prism or standard grating), which separates overlapping high orders of spectrum. On the drawing this elements are marked in the reverse order. --Bori64 (talk) 16:18, 10 January 2014 (UTC)
Not all spectrometers use cross dispersion. Aqua/AIRS uses filters. 137.79.95.240 (talk) 16:56, 29 August 2019 (UTC)