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  • 1
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    Erratum: Density effect for the ionization loss of charged particles in various substances (1983)
    American Physical Society
    Details
    Publication Date: 1983-06-01
    Print ISSN: 0163-1829
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society
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    PAPER CURRENT
  • 2
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    Three-dimensional imaging of X-ray and gamma-ray objects in real time (1980)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: A simple device is described that is capable of providing real-time 3-D viewing of extended X-ray and gamma-ray objects. The visible-light images produced by the device are not merely stereoscopic, i.e., one perspective, but possess both horizontal and vertical parallax with a reasonably large field of view.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics; 19; Sept. 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    X-ray imaging of extended objects using nonoverlapping redundant array (1983)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: A common problem associated with X-ray imaging using coded apertures is the reconstruction of low-intensity extended objects. In the decoding of such objects, the overlapping images from the multiple pinholes give rise to noise cross talk and, in many cases, also to signal cross talk. In this paper, an alternate approach is proposed based on the principle used in an earlier (Yin et al., 1980) laboratory device for the real-time viewing of X-ray objects. It is shown that with this approach, the nonoverlapping redundant array, the sidelobes in the point spread function are not eliminated but merely displaced through a suitable choice of geometry. In this manner, the sidelobes no longer contribute to the background in the vicinity of a reconstructed image, and both signal and noise cross talks are completely eliminated. It may now be possible to reconstruct extended X-ray objects in 3-D by simple optical correlation and tomographically by a computer.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics (ISSN 0003-6935); 22; July 15
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    A small, battery-operated fluoroscopic system - Lixiscope with X-ray generator (1983)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: A small, battery-operated X-ray generator has been developed to be used as part of a small-format fluoroscopic system, the Lixiscope (Low Intensity X-ray Imaging Scope). The X-ray generator consists of a grounded rod-anode X-ray tube with a 0.2 mm focal spot and a specially designed, battery-operated, 0 to -80 kV high-voltge supply. Total power consumption is about 10 W. The fine focal spot, in conjunction with the continuously variable X-ray intensity and spectral distribution, helps to extend both the versatility and the performance of the Lixiscope toward a much wider range of terrestrial and spacecraft applications. The complete fluoroscopic system is described, and some examples of possible applications are shown.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Materials Evaluation (ISSN 0025-5327); 41; June 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Tomographic and analog 3-D simulations using NORA (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The results of two computer simulations demonstrate the feasibility of using the nonoverlapping redundant array (NORA) to form three-dimensional images of objects with X-rays. Pinholes admit the X-rays to nonoverlapping points on a detector. The object is reconstructed in the analog mode by optical correlation and in the digital mode by tomographic computations. Trials were run with a stick-figure pyramid and extended objects with out-of-focus backgrounds. Substitution of spherical optical lenses for the pinholes increased the light transmission sufficiently that objects could be easily viewed in a dark room. Out-of-focus aberrations in tomographic reconstruction could be eliminated using Chang's (1976) algorithm.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics (ISSN 0003-6935); 23; 2239-224
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    NASA/MSFC ground experiment for large space structure control verification (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Marshall Space Flight Center has developed a facility in which closed loop control of Large Space Structures (LSS) can be demonstrated and verified. The main objective of the facility is to verify LSS control system techniques so that on orbit performance can be ensured. The facility consists of an LSS test article which is connected to a payload mounting system that provides control torque commands. It is attached to a base excitation system which will simulate disturbances most likely to occur for Orbiter and DOD payloads. A control computer will contain the calibration software, the reference system, the alignment procedures, the telemetry software, and the control algorithms. The total system will be suspended in such a fashion that LSS test article has the characteristics common to all LSS.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-TM-86496 , NAS 1.15:86496
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    New position-sensitive hard X-ray spectrometer (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The design and features of a new prototype Lixiscope (Low intensity X-ray imaging scope) is described. It is shown that in addition to good spatial and temporal resolution in the 20 keV to 200 keV region, it is capable of single-photon counting, imaging as well as good energy resolution. It is concluded that the device is well suited for future low-flux applications in astronomy, medicine, and industry.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: PB80-211667 , Review of Scientific Instruments; 51; June 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    A hard X ray and soft gamma ray telescope spectrometer (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: A telescope spectrometer in the hard X-ray and soft gamma-ray region from 30 keV to 200 keV can provide significant information in investigations related to solar physics and planetary science. The present study is concerned with the preliminary design of such an instrument, taking into account a use of the Low Intensity X-ray Imaging Scope (Lixiscope). In the design of the considered telescope spectrometer, attention would have to be given to three major components, including the X-ray and gamma-ray input optics, an imaging detector-spectrometer, and an output processor. The preliminary results provided by the present study indicate that, in principle, a complete hard X-ray and soft gamma-ray telescope imaging spectrometer system using the Lixiscope is feasible. However, much work remains to be done with respect to the optimization and improvement of the system for future flight applications.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: In: Imaging spectroscopy; February 10, 11, 1981; Los Angeles, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Effects of flexibility on AGS performance (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The Marshall Space Flight Center has had under development the Annular Suspension Pointing System Gimbal System (AGS) since early 1979. The AGS is an Orbiter cargo bay mounted subarcsecond 3 axis inertial pointer that can accommodate a wide range of payloads which require more stringent pointing than the Orbiter can provide. This paper will describe the AGS, state performance requirements and the control law configuration. Then an approach to investigating the flexible body effects on control system design will be discussed.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: AAS 82-002 , Guidance and control 1982; Jan 30, 1982 - Feb 03, 1982; Keystone, CO; United States
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Planning for long term control of Space Station (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The National Aeronautics and Space Administration (NASA) is conducting conceptual studies concerning the development of a future U.S. Space Station. The Space Station navigation, guidance, and control functions must be performed over the projected long lifetime of the station. After examining the pertinent history of U.S. spacecraft, this paper examines how these long-term operations can be achieved, settling on autonomous operations as a desirable goal. The paper concludes with a recommended development approach.
    Keywords: LAUNCH VEHICLES AND SPACE VEHICLES
    Type: AAS PAPER 83-062 , Guidance and control 1983; Feb 05, 1983 - Feb 09, 1983; Keystone, CO
    Format: text
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    NASA TECHNICAL REPORTS
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