Abstract
Modern UV detectors for small aperture space mission to study comets
Highlights
For a long time the efficiency of a space telescope in UV was low because of low quantum efficiency of detectors, losses on reflective coatings on the mirrors, absence of anti-reflecting coating for UV lenses, problems with fabrication of large and complicated UV lenses and red leak of UV filters
For a decade after the completion of the HST, the hopes of astrophysicists are associated with the World Space Observatory - Ultraviolet (WSO-UV) Project, which is scheduled to launch in 2025 (Sachkov et al, 2020, 2019)
To observe comets in UV, we suggest putting at least 4 multilayer filters directly on the detector: three for the UV range (FUV, NUV1, NUV2) and one standard V filter to correct the long-pass transmission of UV filters, e.g. for red leak calibration
Summary
For a long time the efficiency (total transmittance or effective area) of a space telescope in UV was low because of low quantum efficiency of detectors, losses on reflective coatings on the mirrors, absence of anti-reflecting coating for UV lenses, problems with fabrication of large and complicated UV lenses and red leak of UV filters. The progress in detector and multiplayer filter technologies makes it possible to significantly improve the efficiency of UV telescopes, especially in the nearUV range. The UV detector with anti-reflective coating and (possibly) with directly deposited UV filters is the key element of the telescope. The design of a new UV wide field telescope should be carried out in parallel with the design of a large format detector and filters
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