échelle d"incendie - significado y definición. Qué es échelle d"incendie
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Qué (quién) es échelle d"incendie - definición

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

SOPHIE échelle spectrograph         
FRENCH ASTRONOMICAL INSTRUMENT
SOPHIE spectrograph; SOPHIE echelle spectrograph
The SOPHIE (Spectrographe pour l’Observation des Phénomènes des Intérieurs stellaires et des Exoplanètes, literally meaning "spectrograph for the observation of the phenomena of the stellar interiors and of the exoplanets") échelle spectrograph is a high-resolution echelle spectrograph installed on the 1.93m reflector telescope at the Haute-Provence Observatory located in south-eastern France.
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.
Ď         
LETTER OF THE LATIN ALPHABET
D-caron; D caron; D with caron; D’
The grapheme Ď (minuscule: ď) is a letter in the Czech and Slovak alphabets used to denote , the voiced palatal plosive (precisely alveolo-palatal), a sound similar to British English d in dew.

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.