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  • Other Sources  (5)
  • NASA Technical Reports  (5)
  • Energy Production and Conversion  (3)
  • ELECTRONIC COMPONENTS AND CIRCUITS  (2)
  • 1995-1999  (5)
  • 1950-1954
  • 1
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    A Space Testbed for Photovoltaics (1998)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: The Ohio Aerospace Institute and the NASA Lewis Research Center are designing and building a solar-cell calibration facility, the Photovoltaic Engineering Testbed (PET) to fly on the International Space Station to test advanced solar cell types in the space environment. A wide variety of advanced solar cell types have become available in the last decade. Some of these solar cells offer more than twice the power per unit area of the silicon cells used for the space station power system. They also offer the possibilities of lower cost, lighter weight, and longer lifetime. The purpose of the PET facility is to reduce the cost of validating new technologies and bringing them to spaceflight readiness. The facility will be used for three primary functions: calibration, measurement, and qualification. It is scheduled to be launched in June of 2002.
    Keywords: Energy Production and Conversion
    Type: Proceedings of the Seventh International Space University Alumni Conference; 49-51; NASA/CP-1999-209199
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Electronic Compensation For Distortion Of Antenna Reflector (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Proposed method of obtaining approximately desired radiation or reception pattern from antenna that includes reflector based on concept of superposition of electromagnetic fields generated by multiple feedhorns or feed antenna elements arrayed at various positions near reflector and excited at electronically adjustable magnitudes and phases. In intended application, reflector nominally paraboloidal, feed elements N feedhorns in hexagonal array, and method used to compensate for deviations of real reflector surface from nominal paraboloidal shape. Method and concept also applicable to electronic beam steering and electronic antenna compensation in other situations.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: LAR-14461 , NASA Tech Briefs (ISSN 0145-319X); 19; 1; P. 32
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Recent Advances in Solar Cell Technology (1996)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The advances in solar cell efficiency, radiation tolerance, and cost over the last decade are reviewed. Potential performance of thin-film solar cells in space are discussed, and the cost and the historical trends in production capability of the photovoltaics industry are considered with respect to the requirements of space power systems. Concentrator cells with conversion efficiency over 30%, and nonconcentrating solar cells with efficiency over 25% are now available, and advanced radiation-tolerant cells and lightweight, thin-film arrays are both being developed. Nonsolar applications of solar cells, including thermophotovoltaics, alpha- and betavoltaics, and laser power receivers, are also discussed.
    Keywords: Energy Production and Conversion
    Type: NASA-TM-112758 , NAS 1.15:112758 , AIAA Paper 95-0027 , Aerospace Sciences; Jan 09, 1995 - Jan 12, 1995; Reno, NV; United States|Journal of Propulsion and Power; 12; 5; 835-841
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Computing Radiation From Multiple-Circular-Aperture Antennas (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Mutual Coupling Program for Circular Waveguide-fed Aperture Array (CWG) computer program developed to calculate electromagnetic interactions among elements of antenna arrays with circular apertures with specified distributions of electromagnetic fields in apertures. Distributions assumed superpositions of electromagnetic modes existing in circular waveguide. Various external media included to provide flexibility of use; for example, flexibility to determine effects of dielectric covers upon impedances of aperture-type antennas. Written in VAX FORTRAN for DEC VAX-series computers running VMS (LAR-15236) and IBM PC-series and compatible computers running MS-DOS (LAR-15226).
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: LAR-15226 , LAR-15236 , NASA Tech Briefs (ISSN 0145-319X); 19; 4; P. 62
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Photovoltaic Power for Mars Exploration (1997)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: Mars is a challenging environment for the use of solar power. The implications of the low temperatures and low light intensity, solar spectrum modified by dust and changing with time of day and year, indirect sunlight, dust storms, deposited dust, wind, and corrosive peroxide-rich soil are discussed with respect to potential photovoltaic power systems. The power systems addressed include a solar-powered rover vehicle and a human base. High transportation costs dictate high efficiency solar cells or alternatively, a 'thin film' solar cell deposited on a lightweight plastic or thin metal foil.
    Keywords: Energy Production and Conversion
    Type: The Sixth Alumni Conference of the International Space University; 69; NASA-CP-3355
    Format: text
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    NASA TECHNICAL REPORTS
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