Computer Science – Sound
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992phdt........14k&link_type=abstract
Ph.D. Thesis Maryland Univ., College Park.
Computer Science
Sound
Coronagraphs, Optical Equipment, Rocket-Borne Instruments, Solar Corona, Spectrographs, Spectroheliographs, Ultraviolet Telescopes, Coatings, Design Analysis, Fabry-Perot Interferometers, Imaging Techniques, Lenses, Mirrors, Occultation, Plasma Diagnostics, Solar Limb
Scientific paper
The spectrocoronagraph was specifically designed to observe the solar corona utilizing the relatively unexplored near-UV emission lines present above the solar limb. These lines were first observed by the Naval Research Laboratory Skylab spectrograph and are relatively bright with respect to the solar disk. They contain a number of useful plasma temperature and density diagnostics. The instrument allows a large number of high spatial resolution (less than 1 arc-second), narrow band-width (approximately 0.1 A), two dimensional coronal images in these emission lines to be obtained during a single sounding rocket flight. These observations will yield valuable information on the dominant physical processes present in the inner corona. The spectrocoronagraph consists of a low stray light telescope followed by an imaging spectrograph. The telescope and spectrograph designs incorporate new features to enhance their performance. The coronagraph telescope design includes a Lyot stop and an occulter to reduce instrument stray light levels. The nontraditional choice of a mirror objective allows a compact design with superb solar rejection, no chromatic aberration and excellent imaging properties. The focal plane package utilizes a Fabry-Perot (FP) interferometer in series with a grating spectrograph to produce a channelled spectrum consisting of a series of two dimensional, narrow bandwidth images at the instrument focal plane. All significant optical performance issues have been examined and resolved. The optical performance of near-UV FP interferometer coatings was investigated and found to be sufficient for this application. Measurements of visible and near-UV scattered light from two super-polished mirrors were obtained. The visible measurements showed that the near specular scattered light from these mirrors was equivalent to or better than scattered light from coronagraph quality lenses and mirrors described in the literature. The scattered disk radiation originating at the mirror objective was predicted from the near-UV measurements and compared favorably with coronal intensities at the focal plane.
No associations
LandOfFree
The optical design of the spectrocoronagraph: An ultraviolet coronagraph payload for a sounding rocket platform does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The optical design of the spectrocoronagraph: An ultraviolet coronagraph payload for a sounding rocket platform, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The optical design of the spectrocoronagraph: An ultraviolet coronagraph payload for a sounding rocket platform will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-939723