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  • 1
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    (abstract) Scaling Nominal Solar Cell Impedances for Array Design (1994)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: This paper discusses a task the objective of which is to characterize solar cell array AC impedance and develop scaling rules for impedance characterization of large arrays by testing single solar cells and small arrays. This effort is aimed at formulating a methodology for estimating the AC impedance of the Mars Pathfinder (MPF) cruise and lander solar arrays based upon testing single cells and small solar cell arrays and to create a basis for design of a single shunt limiter for MPF power control of flight solar arrays having very different inpedances.
    Keywords: Energy Production and Conversion
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    NASA TECHNICAL REPORTS
  • 2
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    Scaling Nominal Solar Cell Impedances for Array Design (1994)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: A methodology for estimating the AC impedance of solar arrays and in particular the Mars Pathfinder (MPF) cruise and lander solar arrays is presented.
    Keywords: Energy Production and Conversion
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    NASA TECHNICAL REPORTS
  • 3
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    Angle of Incidence Corrections for GaAs/Ge Solar Cells with Low Absorptance Coverglass (1996)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: A total of four different types of coverglass/filter combinations were tested over a 0 to 85 degree angle of incidence range. One group of cells was irradiated to provide additional data.
    Keywords: Energy Production and Conversion
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    NASA TECHNICAL REPORTS
  • 4
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    Balloon and Lear Jet Testing of Scarlet Modules and Cells (2004)
    In:  CASI
    Details
    Publication Date: 2018-06-06
    Description: This paper presents test results from SCARLET (Solar Concentrator Array with Refractive Linear Element Technology) experiments performed on several Lewis Research Center Lear jet flights and two JPL balloon flights. The tests were performed in support of the BMDO sponsored SCARLET II program, which is building a 2.6 kW SCARLET solar array to supply the primary power for the JPL New Millennium Deep Space 1 Mission. The experiments involve TECSTAR dual junction GaInP2/GaAs/Ge cells flown bare and under two different types of SCARLET lenses. The two types of lenses tested were a developmental design consisting of monolithic THV fluoroplastic and the current baseline flight design consisting of ceria-doped microsheet and silicone. Measured lens and total module efficiencies are presented and the flight data is compared to various solar simulator test results.
    Keywords: Energy Production and Conversion
    Type: Proceedings of the 15th Space Photovoltaic Research and Technology Conference; 177-189; NASA/CP-2004-212735
    Format: application/pdf
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  • 5
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    Correcting For Capacitance In Tests Of Solar Cells (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Modified procedure for testing solar photovoltaic cells and modified software for processing test data provide corrections for effects of cell capacitance. Procedure and software needed because (a) some photovoltaic devices (for example, silicon solar cells with back-surface field region) store minority charge carriers in cell junction and thus exhibit significant capacitance, (b) capacitance affects current-vs.-voltage (I-V) measurements made when transient load connected to cell, and (c) transient load used in unmodified version of test procedure. Corrected I-V curve obtained in test of solar cell according to modified procedure approximates true cell voltage vs. cell current more closely.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: NPO-19516 , NASA Tech Briefs (ISSN 0145-319X); 19; 10; P. 14a
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  • 6
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    The Performance of Advanced III-V Solar Cells (2002)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Test results show triple junction solar cells with efficiencies as high as 27% at 28C and 136.7 mw/sq cm. Triple junction cells also achieve up to 27.5% at -120 C and 5 mw/sq cm, conditions applicable to missions to Jupiter. Some triple junction cells show practically no degradation as a result of Low Intensity Low Temperature (LILT) effects, while others show some; this degradation can be overcome with minor changes to the cell design.
    Keywords: Energy Production and Conversion
    Type: 29th IEEE Photovoltaic Specialists Conference; May 19, 2002 - May 24, 2002; New Orleans, LA; United States
    Format: application/pdf
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  • 7
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    Preliminary low temperature electron irradiation of triple junction solar cells (2005)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: JPL has routinely performed radiation testing on commercial solar cells and has also performed LILT testing to characterize cell performance under far sun operating conditions. This research activity was intended to combine the features of both capabilities to investigate the possibility of any room temperature annealing that might influence the measured radiation damage. Although it was not possible to maintain the test cells at a constant low temperature between irradiation and electrical measurements, it was possible to obtain measurements with the cell temperature kept well below room temperature.
    Keywords: Energy Production and Conversion
    Type: 19th Space Photovoltaic Research and Technology Conference; Sep 20, 2005 - Sep 22, 2005; Cleveland, OH; United States
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    NASA TECHNICAL REPORTS
  • 8
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    Wideband Linear Phase Modulator (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Phase modulator for transmission in X band provides large phase deviation that remains nearly linear with voltage over relatively wide range. Operates with low loss over wide frequency band and with stable characteristics over wide temperature range. Phase modulator contains two varactor-diode phase shifters coupled via circulators. Separate drive circuit applies modulating voltages to varactor diodes. Modulation voltages vary in accordance with input to drive circuit.
    Keywords: ELECTRONIC COMPONENTS AND CIRCUITS
    Type: NPO-18602 , NASA Tech Briefs (ISSN 0145-319X); 18; 4; P. 44
    Format: text
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  • 9
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    Solar Cell Angle of Incidence Corrections (1995)
    In:  CASI
    Details
    Publication Date: 2019-08-16
    Description: The Mars Pathfinder mission has three different solar arrays each of which sees changes in incidence angle during normal operation. When solar array angle of incidence effects was researched little published data was found. The small amount of-published data created a need to obtain and evaluate such data. The donation of the needed data, which was taken in the fall of 1994, was a major factor in the preparation of this paper.
    Keywords: Energy Production and Conversion
    Type: Space Photovoltaic Research and Technology 1995; 168-177; NASA-CP-10180
    Format: text
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