The spectroscopy scale , in Astronomy, indicates a spectroscopic technique of observation which makes it possible to reach spectral resolutions very high. Contrary to the Spectroscopy long-slit, the spectroscopy scale uses the high orders of Diffraction, which are then dispersed spatially. The name of this technique comes from the provision “in scale” of the spectral orders on the detector (like a CCC).
A spectrograph scale uses a diffraction pattern scale. Contrary to the usual spectrgraphes, a network scale is used with very high orders (from 20 to 120 according to the apparatuses). That with the advantage of allowing very high-resolutions, but n the other hand, very little luminous flow is dispersed, since it is known that the intensity of an order is an opposite function of the square of the order (what means that order 100 receives 10000 times less light than order 1).
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