High resolution telescope

Massie, N A; Oster, Y

Title: High resolution telescope

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Abstract

A large effective-aperture, low-cost optical telescope with diffraction-limited resolution enables ground-based observation of near-earth space objects. The telescope has a non-redundant, thinned-aperture array in a center-mount, single-structure space frame. It employs speckle interferometric imaging to achieve diffraction-limited resolution. The signal-to-noise ratio problem is mitigated by moving the wavelength of operation to the near-IR, and the image is sensed by a Silicon CCD. The steerable, single-structure array presents a constant pupil. The center-mount, radar-like mount enables low-earth orbit space objects to be tracked as well as increases stiffness of the space frame. In the preferred embodiment, the array has elemental telescopes with subaperture of 2.1m in a circle-of-nine configuration. The telescope array has an effective aperture of 12m which provides a diffraction-limited resolution of 0.02 arc seconds. Pathlength matching of the telescope array is maintained by an electro-optical system employing laser metrology. Speckle imaging relaxes pathlength matching tolerance by one order of magnitude as compared to phased arrays. Many features of the telescope contribute to substantial reduction in costs. These include eliminating the conventional protective dome and reducing on-site construction activities. The cost of the telescope scales with the first power of the aperture rather than its third power as inmore »« less

Inventors:: Massie, N A; Oster, Y

Publication Date:: Mon Jan 01 00:00:00 EST 1990

Research Org.:: Lawrence Livermore National Lab., CA (United States)

Sponsoring Org.:: USDOE; USDOE, Washington, DC (United States)

OSTI Identifier:: 6060384

Patent Number(s):: PATENTS-US-A7524118

Application Number:: ON: DE92004617; PPN: US 7-524118

Assignee:: Dept. of Energy

DOE Contract Number:: W-7405-ENG-48

Resource Type:: Patent Application

Resource Relation:: Patent File Date: 16 May 1990

Country of Publication:: United States

Language:: English

Subject:: 47 OTHER INSTRUMENTATION; TELESCOPES; DESIGN; ASTRONOMY; CHARGE-COUPLED DEVICES; COST; DIFFRACTION; INTERFEROMETRY; INVENTIONS; SIGNAL-TO-NOISE RATIO; SPATIAL RESOLUTION; SURVEILLANCE; COHERENT SCATTERING; RESOLUTION; SCATTERING; SEMICONDUCTOR DEVICES; 440600* - Optical Instrumentation- (1990-)

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                    Massie, N A, and Oster, Y. High resolution telescope.  United States: N. p., 1990. 
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                    Massie, N A, & Oster, Y. High resolution telescope.  United States.

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                    Massie, N A, and Oster, Y. 1990.  
        "High resolution telescope".  United States.

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@article{osti_6060384,

  title        = {High resolution telescope},

  author       = {Massie, N A and Oster, Y},

  abstractNote = {A large effective-aperture, low-cost optical telescope with diffraction-limited resolution enables ground-based observation of near-earth space objects. The telescope has a non-redundant, thinned-aperture array in a center-mount, single-structure space frame. It employs speckle interferometric imaging to achieve diffraction-limited resolution. The signal-to-noise ratio problem is mitigated by moving the wavelength of operation to the near-IR, and the image is sensed by a Silicon CCD. The steerable, single-structure array presents a constant pupil. The center-mount, radar-like mount enables low-earth orbit space objects to be tracked as well as increases stiffness of the space frame. In the preferred embodiment, the array has elemental telescopes with subaperture of 2.1m in a circle-of-nine configuration. The telescope array has an effective aperture of 12m which provides a diffraction-limited resolution of 0.02 arc seconds. Pathlength matching of the telescope array is maintained by an electro-optical system employing laser metrology. Speckle imaging relaxes pathlength matching tolerance by one order of magnitude as compared to phased arrays. Many features of the telescope contribute to substantial reduction in costs. These include eliminating the conventional protective dome and reducing on-site construction activities. The cost of the telescope scales with the first power of the aperture rather than its third power as in conventional telescopes. 9 figs., 1 tab.},

  doi          = {},

  url          = {https://www.osti.gov/biblio/6060384},
  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {Mon Jan 01 00:00:00 EST 1990},

  month        = {Mon Jan 01 00:00:00 EST 1990}

}

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