skip to main content
DOE Patents title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: High resolution telescope

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 2.1 m in a circle-of-nine configuration. The telescope array has an effective aperture of 12 m 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 activites. The cost of the telescope scales with the first power of the aperture rather than its third powermore » as in conventional telescopes.« less

Inventors:
 [1];  [2]
  1. San Ramon, CA
  2. Danville, CA
Issue Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
OSTI Identifier:
868522
Patent Number(s):
5159489
Assignee:
United States of America as represented by United States (Washington, DC)
Patent Classifications (CPCs):
G - PHYSICS G02 - OPTICS G02B - OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
resolution; telescope; effective-aperture; low-cost; optical; diffraction-limited; enables; ground-based; observation; near-earth; space; non-redundant; thinned-aperture; array; center-mount; single-structure; frame; employs; speckle; interferometric; imaging; achieve; signal-to-noise; ratio; mitigated; moving; wavelength; operation; near-ir; image; sensed; silicon; ccd; steerable; constant; pupil; radar-like; mount; low-earth; orbit; tracked; increases; stiffness; preferred; embodiment; elemental; telescopes; subaperture; circle-of-nine; configuration; effective; aperture; 12; provides; 02; pathlength; matching; maintained; electro-optical; employing; laser; metrology; relaxes; tolerance; magnitude; compared; phased; arrays; features; contribute; substantial; reduction; costs; eliminating; conventional; protective; dome; reducing; on-site; construction; activites; cost; scales; power; third; diffraction-limited resolution; space frame; signal-to-noise ratio; preferred embodiment; substantial reduction; noise ratio; speckle imaging; telescope array; laser metrology; resolution telescope; resolution enables; orbit space; optical telescope; phased array; near-earth space; elemental telescopes; thinned-aperture array; ground-based observation; enables ground-based; low-cost optical; /359/

Citation Formats

Massie, Norbert A, and Oster, Yale. High resolution telescope. United States: N. p., 1992. Web.
Massie, Norbert A, & Oster, Yale. High resolution telescope. United States.
Massie, Norbert A, and Oster, Yale. Wed . "High resolution telescope". United States. https://www.osti.gov/servlets/purl/868522.
@article{osti_868522,
title = {High resolution telescope},
author = {Massie, Norbert A and Oster, Yale},
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 2.1 m in a circle-of-nine configuration. The telescope array has an effective aperture of 12 m 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 activites. The cost of the telescope scales with the first power of the aperture rather than its third power as in conventional telescopes.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1992},
month = {1}
}

Patent:

Save / Share: