échelle de secours - traducción al Inglés
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échelle de secours - traducción al Inglés

TYPE OF DIFFRACTION GRATING USED IN SPECTROMETERS
Echelle Grating; Echelle spectrograph; High resolution echelle spectrograph; High-resolution echelle spectrograph; Echelle

échelle de secours      
n. fire escape

Definición

de-
1.
De- is added to a verb in order to change the meaning of the verb to its opposite.
...becoming desensitized to the harmful consequences of violence.
...how to decontaminate industrial waste sites.
PREFIX
2.
De- is added to a noun in order to make it a verb referring to the removal of the thing described by the noun.
I've defrosted the freezer...
The fires are likely to permanently deforest the land.
PREFIX

Wikipedia

Echelle grating

An echelle grating (from French échelle, meaning "ladder") is a type of diffraction grating characterised by a relatively low groove density, but a groove shape which is optimized for use at high incidence angles and therefore in high diffraction orders. Higher diffraction orders allow for increased dispersion (spacing) of spectral features at the detector, enabling increased differentiation of these features. Echelle gratings are, like other types of diffraction gratings, used in spectrometers and similar instruments. They are most useful in cross-dispersed high resolution spectrographs, such as HARPS, PARAS, and numerous other astronomical instruments.