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  • 1
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    Partial performance degradation of a remote sensor in a space environment, and some probable causes (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The Multispectral Scanner (MSS) was launched on the Earth Resources Technology Satellite (ERTS-1) on July 23, 1972. The MSS has two calibration systems, one internal and one external. Both calibration systems have shown strong, spectrally dependent performance degradation since launch. This paper presents details on the optical system of the MSS and data on the performance degradation as a function of both spectral interval and time in orbit. The history of the MSS during tests is traced, and it is shown that hydrocarbons from an external source may have been deposited on optical surfaces in the instrument. It is postulated that these contaminant coatings may have polymerized as a result of the exposure to UV light from the sun, increasing their blue absorbtion and accounting for the observed performance degradation.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics; 13; May 1974
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    In orbit sun calibration performance of Landsat-2 (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Sun calibration data from Landsat-2 are presented and compared with those from Landsat-1 (ERTS-1). The data support the hypothesis that organic contamination caused the poor performance of the Landsat-1 sun calibration mirror, since extra cleanliness precautions were taken with the Landsat-2 mirror. These precautions are described; of particular importance was the aluminum foil covering kept close to the reflective surfaces of the second mirror during the prelaunch period.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Applied Optics; 14; Sept
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Flight test results of an automatic support system on board a YF-12A airplane (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: An automatic support system concept that isolated faults in an existing nonavionics subsystem was flight tested up to a Mach number of 3. The adaptation of the automated support concept to an existing system (the jet engine automatic inlet control system) caused most of the problems one would expect to encounter in other applications. These problems and their solutions are discussed. Criteria for integrating automatic support into the initial design of new subsystems are included in the paper. Cost effectiveness resulted from both the low maintenance of the automated system and the man-hour saving resulting from the real time diagnosis of the monitored subsystem.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Performance of optical surfaces in space. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The Multispectral Scanner carried by the ERTS-1 satellite (launched on July 23, 1972) is a very high resolution line scanning imaging radiometer operating in the visible and near infrared spectral regions. The instrument contains optical surfaces that are exposed to both direct and reflected sunlight, and the reflectivity and transmission of some of these surfaces have decreased in orbit. Details of the optical system are explained, and data on the degradation are reviewed as a function of both spectral interval and time in orbit. The history of the scanner during testing (when hydrocarbons from an external source may have been deposited on the optical surfaces) is also examined, and a mechanism is postulated for the observed degradation in orbit.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Spring Meeting of the Optical Society of America; Mar 13, 1973 - Mar 16, 1973; Denver, CO
    Format: text
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    NASA TECHNICAL REPORTS
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