On-Orbit Optical Observations of the ESEX 26kW Ammonia Arcjet
Abstract
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 11, 2001
- Accession Number
- ADA405823
Entities
People
- D. R. Bromaghim
- G. G. Spanjers
- L. K. Johnson
- M. W. Dulligan
Organizations
- Air Force Research Laboratory