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  • 1
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    The Fabry-Perot Interferometer on Dynamics Explorer (1981)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: The Fabry-Perot Interferometer (FPI) on Dynamics Explorer is a remote sensing instrument designed to measure the temperature, meridional wind and density of the metastable atoms O(1S) and O(1D), and the ion O(plus)(2P) in the thermosphere. The measurements are made with a stable, high resolution Fabry-Perot etalon, which performs a wavelength analysis on the light detected from the thermospheric emission features by spatially scanning the interference fringe plane with a multichannel array detector. The wavelength analysis characterizes the Doppler line profile of the emitting species. A sequential altitude scan, performed by a commandable horizon scan mirror, provides a cross-sectional view of the thermodynamic and dynamic state of the thermosphere below the orbit of the Dynamics Explorer B satellite.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: Space Science Instrumentation; 5; Dec. 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Image plane detector for the dynamics explorer Fabry-Perot interferometer (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A compact twelve-channel photon-counting device based on existing Generation II imaging technology has been developed for use as the image-plane detector of the Dynamics Explorer Fabry-Perot interferometer. The device has an S-20 photocathode, three-microchannel plate electron multiplication stages, and an equal-area concentric-ring segmented anode whose geometry mimics that of the interference ring pattern produced by a plane etalon. The twelve channels sample equal and contiguous intervals in the spectrum. The purpose of the delopment has been to utilize the signal multiplex advantage of a multichannel detector in the measurement of Doppler shifts and line-broadening effects for naturally occurring atmospheric emission features of low intensity. The design, testing, calibration, and flight performance of the novel detector system are presented. In addition, measured emission line profiles at high resolution from the satellite instrument are presented to illustrate the operation of the device.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: Applied Optics (ISSN 0003-6935); 22; 3503-351
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Stable and rugged etalon for the Dynamics Explorer Fabry-Perot interferometer. II - Performance (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The etalon is shown to remain stable to less than 5-m/sec equivalent wind over one orbit and less than 100 m/sec over several months in orbit. The thermal stability considerations for the highly stable etalon are discussed, including the passive thermal control used in flight. The various physical processes which give rise to drifts in the peak transmission wavelength are quantified, and the kinematic mount used to isolate the etalon from large incremental forces caused by changes in the thermal environment is presented. The performance of the etalon in its flight configuration is evaluated.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: Applied Optics; 21; Nov. 1
    Format: text
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    NASA TECHNICAL REPORTS
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