During the course of eight flight firings of the ESEX 26 kW arcjet in March and April, 1999, optical observations from on-board and ground-based sensors were obtained. Images from the on-board still camera indicate that the nozzle temperature distribution is consistent with arcjet heating models and ground observations. Images of the thruster plume at 656 nm confirm predictions that the luminescent plume in the space environment is more diffuse and compact than the plume from a thruster operated in the laboratory at a higher background pressure. Finally, observations using a ground-based telescope reveal a mixed greybody/line emission spectrum over the range 325-675 nm. The spectral features and line ratios are similar to those observed in ground-based measurements.


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    Titel :

    On-Orbit Optical Observations of the ESEX 26kW Ammonia Arcjet


    Beteiligte:
    L. K. Johnson (Autor:in) / G. G. Spanjers (Autor:in) / D. R. Bromaghim (Autor:in) / M. W. Dulligan (Autor:in)

    Erscheinungsdatum :

    2001


    Format / Umfang :

    23 pages


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch




    On-orbit optical observations of the ESEX 26 kW ammonia arcjet

    Johnson, L. / Spanjers, G. / Bromaghim, D. et al. | AIAA | 1999


    In-Flight Contamination Measurements of the ESEX 26 kW Ammonia Arcjet

    G. Spanjers / J. Schilling / S. Engelman et al. | NTIS | 1999


    Contamination Analysis from the ESEX 26 kW Ammonia Arcjet Flight Experiment

    Spanjers, G. G. / Schilling, J. H. / Engelman, S. F. et al. | British Library Conference Proceedings | 1999


    Contamination Measurements from the ESEX 26 kW Ammonia Arcjet Flight Experiment

    G. G. Spanjers / J. H. Schilling / S. F. Engelman et al. | NTIS | 1999


    Observations of the Effect on Spacecraft Function and Communications by the ESEX 26kW Ammonia Arcjet

    M. J. Dulligan / D. R. Bromaghim / J. A. Zimmerman et al. | NTIS | 2001