Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979qjras..20..395b&link_type=abstract
Royal Astronomical Society, Quarterly Journal, vol. 20, Dec. 1979, p. 395-421.
Astronomy and Astrophysics
Astronomy
7
Astronomical Spectroscopy, Gratings (Spectra), Spaceborne Astronomy, Spectrographs, Spectrometers, Wave Diffraction, Electronography, H Alpha Line, Photographic Emulsions, Signal To Noise Ratios, Telescopes
Scientific paper
Methods of designing very sensitive diffraction grating spectrometers and spectrographs, mainly plane reflecting grating instruments but also including multi-order instruments, are discussed. The product of the resolving power and the entrance slit width (Ra), is regarded as a figure of merit involving diffraction gratings, and the product of the number of resolved spectral elements and the entrance slit width is a figure of merit involving cameras. To maximize Ra, designs are based on grating width and blaze angle, rather than collimator size and angular dispersion. In addition, wavelength errors due to image motion on the slit can be mitigated by increasing Ra. Matching the slit image to the linear resolution of the detection may waste the capability of the grating; the use of a 'resolving power function' (like the optical transfer function) is recommended.
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