2026-09-18T21:18:20Zhttps://dspace.mit.edu/server/oai/requestoai:dspace.mit.edu:1721.1/1270772021-07-05T14:03:20Zcom_1721.1_7582com_1721.1_7581col_1721.1_131023
Rebecca Masterson.
Lambert, Madeline(Madeline Marie)
Massachusetts Institute of Technology. Department of Aeronautics and Astronautics.
Massachusetts Institute of Technology. Department of Aeronautics and Astronautics
2020-09-03T17:45:46Z
2020-09-03T17:45:46Z
2020
2020
https://hdl.handle.net/1721.1/127077
1191820963
Thesis: S.M., Massachusetts Institute of Technology, Department of Aeronautics and Astronautics, May, 2020
Cataloged from the official PDF of thesis.
Includes bibliographical references (pages 203-205).
The Regolith X-ray Imaging Spectrometer (REXIS) is a student-built instrument flown on NASA's Origins, Spectral Interpretation, Resource Identification, Safety, Regolith Explorer (OSIRIS-REx) mission. During main science operations, the instrument experienced detector efficiency loss in the form of loss of iron calibration source counts, which greatly affected the science output. In this thesis, a root cause investigation is performed on the loss of iron counts, and an optical light leak onto the edge of the instrument's detectors is identified as the most likely cause. A CAST analysis is then performed to identify possible organizational and cultural causes of the design that allowed for an optical light leak, and recommendations for future similar instruments (low-cost, high-risk) are made.
by Madeline Lambert.
S.M.
S.M. Massachusetts Institute of Technology, Department of Aeronautics and Astronautics
205 pages
eng
Massachusetts Institute of Technology
MIT theses may be protected by copyright. Please reuse MIT thesis content according to the MIT Libraries Permissions Policy, which is available through the URL provided.
http://dspace.mit.edu/handle/1721.1/7582
Aeronautics and Astronautics.
A root cause analysis of REXIS detection efficiency loss during phase E operations
Thesis
application/pdf
2020-09-03T17:45:46Z
Publication
Master
Aero
unknown
unknown
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<Abstract>The Regolith X-ray Imaging Spectrometer (REXIS) is a student-built instrument flown on NASA's Origins, Spectral Interpretation, Resource Identification, Safety, Regolith Explorer (OSIRIS-REx) mission. During main science operations, the instrument experienced detector efficiency loss in the form of loss of iron calibration source counts, which greatly affected the science output. In this thesis, a root cause investigation is performed on the loss of iron counts, and an optical light leak onto the edge of the instrument's detectors is identified as the most likely cause. A CAST analysis is then performed to identify possible organizational and cultural causes of the design that allowed for an optical light leak, and recommendations for future similar instruments (low-cost, high-risk) are made.</Abstract>
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