Other
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990ngst.conf..296w&link_type=abstract
The Next Generation Space Telescope, p. 296
Other
Ultraviolet Detectors, Light (Visible Radiation), Radiation Detectors, Charge Coupled Devices, Near Infrared Radiation, Photoelectric Emission, Cosmic Rays, Quantum Efficiency, Radiation Shielding, Radiation Damage, Lunar Observatories, Earth Orbits
Scientific paper
The current status of detectors for the visible and UV for future large observatories in earth orbit and the moon is briefly reviewed. For the visible, CCDs have the highest quantum efficiency, but are subject to contamination of the data by cosmic ray hits. For the moon, the level of hits can be brought down to that at the earth's surface by shielding below about 20 meters of rock. For high earth orbits above the geomagnetic shield, CCDs might be able to be used by combining many short exposures and vetoing the cosmic ray hits, otherwise photoemissive detectors will be necessary. For the UV, photoemissive detectors will be necessary to reject the visible; to use CCDs would require the development of UV-efficient filters which reject the visible by many orders of magnitude. Development of higher count rate capability would be desirable for photoemissive detectors.
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