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cross dispersion spectrograph

(echelle spectrograph with additional disperser crosswise to the first)

A cross dispersion spectrograph uses two stages to increase its spectral resolution: first, an echelle grating, which separates the spectrum but with some overlap, and then crosswise to it (close to 90 degrees, I believe) an additional disperser, which could be a prism or a series of prisms. The result is a set of nearly parallel "bars" showing the light and dark portions of the spectrum, each bar showing a part of the spectrum, with some overlap with the adjacent bars. The rectangle encompassing these can be recorded with film or a CCD. Examples:


(color,EMR,spectrography)
Further reading:
http://en.wikipedia.org/wiki/Echelle_grating
http://www.astro.caltech.edu/~george/ay122/Ay122a_Spectroscopy.pdf
http://lasp.colorado.edu/~cranmer/ASTR_7500_2016/Lec_Wenda/wcao_lecture05.pdf

Referenced by pages:
spectroscopy

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