Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983itns...30.1535c&link_type=abstract
IEEE Transactions on Nuclear Science (ISSN 0018-9499), vol. NS-30, April 1983, p. 1535-1538.
Astronomy and Astrophysics
Astronomy
1
Astronomical Spectroscopy, Extreme Ultraviolet Radiation, High Resolution, Stellar Spectrophotometry, Ultraviolet Spectroscopy, X Ray Spectroscopy, Echelle Gratings, Gratings (Spectra), Grazing Incidence, Transmission Efficiency, Wave Diffraction, X Ray Astronomy
Scientific paper
The use of grazing incidence optics and reflection grating designs is shown to be a method that improves the performance of spectrographs at wavelengths shorter than 1200 A. Emphasis is laid on spectroscopic designs for X ray and EUV astronomy, with sample designs for an objective reflection grating spectrograph (ORGS) and an echelle spectrograph for wavelengths longer than 100 A. Conical diffraction allows operations at grazing incidence in the echelle spectrograph. In ORGS, the extreme distance of X ray objects aids in collimating the source radiation, which encounters conical diffraction within the instrument, proceeds parallel to the optical axis, and arrives at the detector. A series of gratings is used to achieve the effect. A grazing echelle is employed for EUV observations, and offers a resolution of 20,000 over a 300 A bandpass.
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