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  • 1980-1984  (10)
Collection
Keywords
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    High Resolution Imaging From the Ground (1982)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Astronomy and Astrophysics 20 (1982), S. 367-398 
    Details
    ISSN: 0066-4146
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.aa.20.090182.002055
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    Paper (German National Licenses)
    Fulltext
  • 2
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    High Resolution Imaging From the Ground (1982)
    Annual Reviews
    Details
    Publication Date: 1982-09-01
    Print ISSN: 0066-4146
    Electronic ISSN: 1545-4282
    Topics: Physics
    Published by Annual Reviews
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    PAPER CURRENT
  • 3
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    Steps toward eight-meter honeycomb mirror blanks. I Rationale and approach (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The best form for 8-m telescope mirrors is discussed. It is concluded that honeycomb sandwich structure can meet the most exacting demand goals for subarcsecond image quality in optical and infrared astronomy. These structures are light, have good stiffness against gravitational and wind loading, and have low thermal inertia. The latter permits them to be operated at the ambient air temperature to avoid local seeing problems. Borosilicate and aluminosilicate glasses are adequate materials for ventilated honeycombs, which do not require low expansion materials.
    Keywords: ASTRONOMY
    Type: New York Academy of Sciences, Annals (ISSN 0077-8923); 422; 163-170
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Steps toward 8m honeycomb mirrors IV - Some aspects of design and fabrication (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: The tolerances in glass homogeneity, thermal control, and support of the blank, necessary to meet the requirements of telescopes in the best ground-based sites, are defined for a hypothetical 8-m honeycomb mirror spin-casting facility. Homogeneity in expansion coefficient of 10 to the -8th/C and thermal equilibration to 0.1 C are estimated. Laboratory measurements show that both can be met by a ventilated honeycomb of borosilicate or similar glass. Adequate resistance to wind pressure and buffeting can be achieved by an axial support that responds to pressure on the three defining points. Annealing of the blank at the peak cooling rate of 20 C/day will take about six weeks, leading to a temporary stress of 15 kg/sq cm.
    Keywords: MECHANICAL ENGINEERING
    Type: Advanced technology optical telescopes II; September 5, 6, 1983; London
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    The versatile array (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: A four-element, nonredundant array telescope-interferometer for ground use is discussed. The elements are 8-meter mirrors, and the maximum array spacing and two element spacing are 75 m and of 108 m, respectively. The array may be used as three separate telescopes, one of 11.3 m and two of 8 m, for work not requiring highest angular resolution. The problems of making speckle measures to high enough precision for synthetic images to be produced are discussed. It is shown that the high resolution presents opportunities for making types of observation that are possible with neither the VLBA nor the National New Technology Telescope.
    Keywords: ASTRONOMY
    Type: AFGL-TR-81-030 , Advanced technology optical telescopes II; September 5, 6, 1983; London
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Deployable reflector configurations (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: Both the theoretical reasons for considering a non-circular format for the Large Deployable Reflector, and a potentially realizable concept for such a device, are discussed. The optimum systems for diffraction limited telescopes with incoherent detection have either a single filled aperture, or two such apertures as an interferometer to synthesize a larger aperture. For a single aperture of limited area, a reflector in the form of a slot can be used to give increased angular resolution. It is shown how a 20 x 8 meter telescope can be configured to fit the Space Shuttle bay, and deployed with relatively simple operations. The relationship between the sunshield design and the inclination of the orbit is discussed. The possible use of the LDR as a basic module to permit the construction of supergiant space telescopes and interferometers both for IR/submm studies and for the entire ultraviolet through mm wave spectral region is discussed.
    Keywords: ASTRONOMY
    Type: Deployable optical systems; january 18, 19, 1983; Los Angeles, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Alignment and phasing of deployable telescopes (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: The experiences in coaligning and phasing the Multi-Mirror Telescope (MMT), together with studies in setting up radio telescopes, are presented. These experiences are discussed, and on the basis they furnish, schemes are suggested for coaligning and phasing four large future telescopes with complex primary mirror systems. These telescopes are MT2, a 15-m-equivalent MMT, the University of California Ten Meter Telescope, the 10 m sub-mm wave telescope of the University of Arizona and the Max Planck Institute for Radioastronomy, and the Large Deployable Reflector, a future space telescope for far-IR and sub-mm waves.
    Keywords: ASTRONOMY
    Type: Deployable optical systems; january 18, 19, 1983; Los Angeles, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Options for a new Arizona observatory - Configurations, costs and site (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The process of creating a major observatory, with emphasis on the configurations, costs, and site involved, is examined. The premise that cost optimization starts with a modestly priced building block, such as a 7.5-m telescope, is considered. The telescope unit and the configurations in which it is used, ranging from a single telescope or a set of separate telescopes, to an MMT in which the light of all of the telescopes can be phased when desired, are described. It is shown that options exist for using elements in a nonredundant linear array or Michelson interferometer. A means of estimating costs of different facilities, all on the same basis, is provided. The importance of placing the observatory on a site, such as Mt. Graham in Arizona, which maximizes the output per unit cost of the facility is discussed.
    Keywords: ASTRONOMY
    Type: Very large telescopes, their instrumentation and programs; Apr 09, 1984 - Apr 12, 1984; Garching
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Good imaging with very fast paraboloidal primaries - An optical solution and some applications (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Attention is given to the imaging performance improvement obtainable in telescopes with fast parabolic primaries by means of two-mirror correctors of the Paul-Baker type. Images with 80 percent of the energy concentrated within 0.2 arcsec are projected for an f/1 primary relaying to an f/2 final focus, over a 1 deg-diameter field. It is noted that the mechanical structure and enclosure of a large telescope built with these fast optics should be significantly smaller and less expensive than those for conventional optics. The application of the Paul-Baker corrector system is explored for such diverse telescope types as those employing six off-axis primary mirrors, UV astronomy telescopes with no chromatic aberration, a low emissivity IR astronomy instrument with an off-axis f/1 parent primary mirror part, and thin rectangular aperture telescopes which are useful for spectroscopy and photometry.
    Keywords: OPTICS
    Type: International Conference on Advanced Technology Optical Telescopes; Mar 11, 1982 - Mar 13, 1982; Tucson, AZ
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Adaptive optics (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: An estimation of the costs and potential resolution and sensitivity benefits of adaptive optics systems is presented. The effects of atmospheric disturbances on the peak-to-peak wavefront errors are assessed. Definitions are included of the maximum permissible controlled patch of entrance pupil of the system, the permissible response time, the permissible field radius, and the required magnitude and frequency of a reference star. It is pointed out that adaptive optics system for visible of near-visible wavelengths is likely to be very expensive, whereas operation at 2-3 microns under best seeing conditions is expected to be useful and have reasonable cost.
    Keywords: OPTICS
    Type: Very large telescopes, their instrumentation and programs; Apr 09, 1984 - Apr 12, 1984; Garching
    Format: text
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    NASA TECHNICAL REPORTS
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