Physics – Optics
Scientific paper
Dec 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...187.7112v&link_type=abstract
American Astronomical Society, 187th AAS Meeting, #71.12; Bulletin of the American Astronomical Society, Vol. 27, p.1386
Physics
Optics
Scientific paper
Operating in the wavelength range of 0.5 to 10 mu m the Dilute Lens Imager (DLI) will observe the universe with unprecedented clarity over wide (by interferometry standards) fields of view. At visible wavelengths DLI will provide a ten-fold improvement in resolution over the Hubble Space Telescope with a modest improvement in sensitivity. Launched into an Earth-trailing solar orbit, the telescope consists of 10-12 apertures placed with minimally redundant spacings on a linear truss. By mimicking the operation of lens elements using reflective optics we reduce all mechanical tolerances by up to 1{{1} /{2}} orders of magnitude, giving rise to a potentially large cost savings compared to a more conventional design. Full sampling in the (u,v)-plane is attained by rotating the spacecraft around the line of sight in a synthetic aperture technique. DLI's 4 mas beam at 0.5 mu m (80 mas at 10 mu m) and 16 arcminute field will afford it a view of the distant universe sufficient to reach objects with z>10. DLI will also attain very high relative positional accuracies, ~ 4-40 mu arcsec , providing a potentially important tool for studies of neighboring planetary systems. Several instrument packages are considered: a spectrometer with R=1000 and a diffraction-limited broad-band camera with a format of 8K x 8K pixels.
Colavita Mark M.
Laskin Robert
van Buren Dale
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