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  • 1
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    Long term variability of transmission of thin In-Sn and Sn-C films for EUV instrumentation (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The transmission variability is reported for two filters in the EUV, where the filters were supported on an 80% transmission nickel mesh and fabricated by means of a vacuum deposition technique. The first film consisted of 2500 A-thick indium, deposited on 500 A-thick tin, and had its primary bandpass in the 740-960 A range. The second consisted of 1800 A-thick tin and 2000 A-thick carbon, with a bandpass of 500-750 A. At the end of 10 months, the transmission of both filters was measured to check variations. It is demonstrated that the EUV transmission of such filters can change over the typical lifetime of satellite missions, and that such variation depends on the storage environment. The use of vacuum, rather than dry nitrogen storage is recommended.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: Applied Optics; 21; Oct. 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Extreme ultraviolet photometer for observations of helium in interplanetary space (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A four-channel photometer sensitive to two solar EUV lines which are resonantly scattered by helium gas was developed for flight on the Apollo-Soyuz Test Project. Two channels observed the 58.4-nm line of He I and used helium gas resonant absorption cells to determine the intensities of the center and wings of that line. The other two channels observed the 30.4-nm line of He II. The instrument surveyed much of the celestial sphere during a series of slow rolling maneuvers by the Apollo spacecraft. The experiment operated properly, and usable data were obtained. Study of the distributions of flux seen, and of the ratio 58.4-nm fluxes seen with gas cells full and empty, will refine current understanding of several poorly known properties of the local interstellar medium. Study of the 30.4-nm flux distribution will refine present knowledge of the structure of the earth's plasmasphere.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: Applied Optics; 16; Mar. 197
    Format: text
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    NASA TECHNICAL REPORTS
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