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  • 1
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    Analysis and testing of a soft actuation system for segmented reflector articulation and isolation (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Segmented reflectors have been proposed for space-based applications such as optical communication and large-diameter telescopes. An actuation system for mirrors in a space-based segmented mirror array has been developed as part of the National Aeronautics and Space Administration-sponsored Precision Segmented Reflector program. The actuation system, called the Articulated Panel Module (APM), articulates a mirror panel in 3 degrees of freedom in the submicron regime, isolates the panel from structural motion, and simplifies space assembly of the mirrors to the reflector backup truss. A breadboard of the APM has been built and is described. Three-axis modeling, analysis, and testing of the breadboard is discussed.
    Keywords: MECHANICAL ENGINEERING
    Type: In: Active and adaptive optical systems; Proceedings of the Meeting, San Diego, CA, July 22-24, 1991 (A93-39451 15-74); p. 213-224.
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    A soft actuation system for segmented reflector articulation and isolation (1990)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Segmented reflectors have been proposed for space based applications such as optical communication and large diameter telescopes. An actuation system for mirrors in a space based segmented mirror array was developed as part of NASA's Precision Segmented Reflector program. The actuation system, called the Articulated Panel Module (APM), provides 3 degrees of freedom mirror articulation, gives isolation from structural motion, and simplifies space assembly of the mirrors to the reflector backup truss. A breadboard of the APM was built and is described.
    Keywords: OPTICS
    Type: NASA, John F. Kennedy Space Center, The 24th Aerospace Mechanisms Symposium; p 57-73
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    POINTS (Precision Optical INTerferometer in Space) (1993)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: POINTS is a high-precision, high-throughput interferometer intended for astromomy only. It can perform science compatable with astrophysics (AIM) and planet detection (TOPS-1). The spacecraft will be compact, lightweight, and suitable for high Earth orbit. It will employ the minimal number and complexity of mechanisms or deployable parts and be designed for a 10 year mission life.
    Keywords: Instrumentation and Photography
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    NASA TECHNICAL REPORTS
  • 4
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    (presentation) Precision Mechanisms for Space Interferometers: A Tutorial (1993)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: To maximize salability, spaceborne interferometer designs must minimize actuator cost while maximizing science quality and quantity. Interferometer designers must have the knowledge to design a system with the simplist, most reliable, and least expensive actuators possible.
    Keywords: Instrumentation and Photography
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    NASA TECHNICAL REPORTS
  • 5
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    Micromachined, Electrostatically Deformable Reflectors (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Micromachined, closed-loop, electrostatically actuated reflectors (microCLEARs) provide relatively simple and inexpensive alternatives to large, complex, expensive adaptive optics used to control wavefronts of beams of light in astronomy and in experimental laser weapons. Micromachining used to make deformable mirror, supporting structure, and actuation circuitry. Development of microCLEARs may not only overcome some of disadvantages and limitations of older adaptive optics but may also satisfy demands of potential market for small, inexpensive deformable mirrors in electronically controlled film cameras, video cameras, and other commercial optoelectronic instruments.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: NPO-19154 , NASA Tech Briefs (ISSN 0145-319X); 19; 10; P. 10a
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    NASA TECHNICAL REPORTS
  • 6
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    Long-Lived Linear-Motion Suspension For Cryogenic Instrument (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Mechanism suspends optical component in cryogenic instrument in such way to allow component to translate smoothly along one axis, without vibration. Bearings located outside cooled instrument chamber for longer life. Thermal isolators separate bearings from cryogenic environment inside instrument chamber.
    Keywords: MECHANICS
    Type: NPO-19284 , NASA Tech Briefs (ISSN 0145-319X); 19; 8; P. 58
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Dynamic Torque Calibration Unit (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Proposed dynamic torque calibration unit (DTCU) measures torque in rotary actuator components such as motors, bearings, gear trains, and flex couplings. Unique because designed specifically for testing components under low rates. Measures torque in device under test during controlled steady rotation or oscillation. Rotor oriented vertically, supported by upper angular-contact bearing and lower radial-contact bearing that floats axially to prevent thermal expansion from loading bearings. High-load capacity air bearing available to replace ball bearings when higher load capacity or reduction in rate noise required.
    Keywords: MACHINERY
    Type: NPO-17509 , NASA Tech Briefs (ISSN 0145-319X); 13; 12; P. 56
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    NASA TECHNICAL REPORTS
  • 8
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    System Would Keep Telescope Reflector Segments Aligned (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Proposed actuation system maintains alignments of reflector segments of large telescope. Sensors measure positions and orientations of segments. Figure-control computer calculates orientation and figure of overall reflector surface from sensor data. Responding to computer output, servocontroller for each actuator corrects piston and tilt errors of each segment. Actuators adjust segments in response to sensed positions. Concept applicable to such large segmented space-based reflectors as those used in communication and in collection of solar energy.
    Keywords: ELECTRONIC SYSTEMS
    Type: NPO-17903 , NASA Tech Briefs (ISSN 0145-319X); 15; 4; P. 40
    Format: text
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    NASA TECHNICAL REPORTS
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