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  • 1
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    Development of a solar-cell dust opacity measurement instrument for Mars Pathfinder (1996)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: The atmosphere of Mars has a considerable load of suspended dust. Over time, this dust is deposited out of the atmosphere. The mechanism and the temporal and geographical variation of this deposition are not well characterized. Measurements of settling rates and dust properties are of considerable scientific interest. Atmospheric dust affects the atmospheric solar absorption and thus the heat balance of Mars, as well as serving as nucleation sites for water and CO2 frost. Knowledge of dust properties is of critical interest to design and prediction of the lifetime and power output of solar arrays, and also to design of mechanical mechanisms and radiators. An instrument has been designed and fabricated to measure the dust accumulation during the course of the Mars Pathfinder rover mission. The solar-cell coverglass transmission experiment will measure the change in optical opacity of a transparent coverglass as dust settles on the surface, and a quartz crystal monitor will measure the mass deposited.
    Keywords: Spacecraft Propulsion and Power
    Type: Space Photovoltaic Research and Technology 1995; 313-317; NASA-CP-3324
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Forward Technology Solar Cell Experiment (FTSCE) for MISSE-5 Verified and Readied for Flight on STS-114 (2005)
    In:  CASI
    Details
    Publication Date: 2018-06-05
    Description: The Forward Technology Solar Cell Experiment (FTSCE) is a space solar cell experiment built as part of the Fifth Materials on the International Space Station Experiment (MISSE-5): Data Acquisition and Control Hardware and Software. It represents a collaborative effort between the NASA Glenn Research Center, the Naval Research Laboratory, and the U.S. Naval Academy. The purpose of this experiment is to place current and future solar cell technologies on orbit where they will be characterized and validated. This is in response to recent on-orbit and ground test results that raised concerns about the in-space survivability of new solar cell technologies and about current ground test methodology. The various components of the FTSCE are assembled into a passive experiment container--a 2- by 2- by 4-in. folding metal container that will be attached by an astronaut to the outer structure of the International Space Station. Data collected by the FTSCE will be relayed to the ground through a transmitter assembled by the U.S. Naval Academy. Data-acquisition electronics and software were designed to be tolerant of the thermal and radiation effects expected on orbit. The experiment has been verified and readied for flight on STS-114.
    Keywords: Spacecraft Propulsion and Power
    Type: Research and Technology 2004; NASA/TM-2005-213419
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Ozone Correction for AM0 Calibrated Solar Cells for the Aircraft Method (2002)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The aircraft solar cell calibration method has provided cells calibrated to space conditions for 37 years. However, it is susceptible to systematic errors due to ozone concentrations in the stratosphere. The present correction procedure applies a 1 percent increase to the measured I(sub SC) values. High band-gap cells are more sensitive to ozone absorbed wavelengths (0.4 to 0.8 microns) so it becomes important to reassess the correction technique. This paper evaluates the ozone correction to be 1+O3xFo, where O3 is the total ozone along the optical path, and Fo is 29.8 x 10(exp -6)/du for a Silicon solar cell, 42.6 x 10(exp -6)/du for a GaAs cell and 57.2 x 10(exp -6)/du for an InGaP cell. These correction factors work best to correct data points obtained during the flight rather than as a correction to the final result.
    Keywords: Spacecraft Propulsion and Power
    Type: NASA/TM-2002-211714 , NAS 1.15:211714 , E-13465 , 29th Photovoltaic Specialists Conference; May 18, 2002 - May 25, 2002; New Orleans, LA; United States
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  • 4
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    The 2001 Mars In-Situ-Propellant-Production Precursor (MIP) Flight Demonstration (2000)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The successful performance of the five individual demonstrations of MARS IN-SITU-PROPELLANT-PRODUCTION PRECURSOR (MIP) will provide both knowledge of and confidence in the reliability of this technology. At the completion of this flight demonstration, the MIP Team will be able to: a) recommend preferred hardware configurations for the intake and adsorption of carbon dioxide from the Martian atmosphere; b) understand the performance characteristics of zirconia cells to generate propellant-grade oxygen; c) understand long-term performance characteristics of advanced solar cells/arrays operated in the actual Mars environment; d) evaluate the functionality of methods to mitigate the deposition of airborne dust onto solar arrays; and e) recommend preferred hardware designs for innovative thermal management including the radiation of heat to the outside environment.
    Keywords: Spacecraft Propulsion and Power
    Type: JSC-CN-6027 , Human Space Transportation and Exploration Workshop; Feb 28, 2000 - Mar 01, 2000; Galveston, TX; United States
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  • 5
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    Photovoltaic Cell Operation on Mars (2004)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The Martian surface environment provides peculiar challenges for the operation of solar arrays: low temperature, solar flux with a significant scattered component that varies in intensity and spectrum with the amount of suspended atmospheric dust, and the possibility of performance loss due to dust deposition on the array surface. This paper presents theoretical analyses of solar cell performance on the surface of Mars and measurements of cells under Martian conditions.
    Keywords: Spacecraft Propulsion and Power
    Type: E-14870 , 19th European Photovoltaic Solar Energy Power Conference; Jun 07, 2004 - Jun 11, 2004; Paris; France
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  • 6
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    Two and Three Dimensional near Infrared Subcutaneous Structure Imager Using Real Time Nonlinear Video Processing (2018)
    In:  CASI
    Details
    Publication Date: 2019-08-26
    Description: An imager is provided for viewing subcutaneous structures. In an embodiment of the invention, the imager includes a camera configured to generate a video frame, and an adaptive nonlinear processor. The adaptive nonlinear processor is configured to adjust a signal of the video frame below a first threshold to a maximum dark level and to adjust the signal of the video frame above a second threshold to a maximum light level. The imager further includes a display, configured to display the processed video frame.
    Keywords: Instrumentation and Photography
    Format: application/pdf
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