Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992esasp.344..181k&link_type=abstract
In ESA, Solar Physics and Astrophysics at Interferometric Resolution p 181-184 (SEE N93-10901 01-90)
Astronomy and Astrophysics
Astrophysics
Design Analysis, Gratings (Spectra), Monochromators, Optical Measuring Instruments, Solar Spectrometers, Interferometry, Spectral Resolution, Spectrographs, Sun, Synthetic Apertures
Scientific paper
Various aspects of the Subtractive Double Monochromator (SDM), the most critical channel (117.5 to 200 nm) of the six channel spectrometer which is the focal instrument of the Solar Ultraviolet Network (SUN), are discussed. The image is diffraction limited over the 4 by 4 sq arcsec field of view, and the spectral resolution is 0.1 nm. The key components of a SDM are formed by two dispersive elements (gratings in this case) that are mounted in a subtractive configuration in order to achieve dispersion compensation on the output beam. A dispersed image is formed in the SDM slit. Grating pitch and slit size are optimized for spectral resolution and image size across the slit. The zero order beam is relayed to subsequent spectrometer channels by means of a mirror on a Wadsworth mounting. The efficiency of the instrument is optimized by applying a blaze to the gratings and introducing anamorphosis in the input beam. The resulting design is promising in terms of meeting the specifications.
Braam Ben C.
Kruizinga Bob
Snijders Bart
Visser Huib
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