NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Reflectance stability analysis of Spectralon diffuse calibration panelsThe Multi-angle Imaging SpectroRadiometer (MISR) plans to use deployable diffuse reflectance panels to provide periodic radiometric calibrations of its nine cameras while in-flight. Near-Lambertian reflectance characteristics are desirable to facilitate flat-field camera intercomparisons. Also required is panel spatial and spectral uniformity, and stability with time. Spectralon, a commercially available polytetrafluoroethylene (PTFE) compound, has been baselined in the MISR design. To assess the suitability of this material, a series of degradation tests were planned and implemented. These included UV vacuum exposure and proton bombardment tests which simulated the exposure levels to be encountered during the mission life. Proton levels are now considered too low to be of concern, but UV vacuum tests demonstrate sensitivity to material contamination. Material investigations have concluded that hydrocarbons are present in the bulk of the material, and that plastic packaging materials can introduce additional surface-layer contamination. It is found however, that these unwanted elements can be eliminated through vacuum pumping at elevated temperatures. Exposure to a UV source, while in vacuum, is again planned for a set of targets which have been vacuum baked. This will assess the stability of the pure PTFE form.
Document ID
19930039591
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Bruegge, Carol J.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Stiegman, Albert E.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Coulter, Daniel R.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Hale, Robert R.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Diner, David J.
(JPL Pasadena, CA, United States)
Springsteen, Arthur W.
(Labsphere, Inc. North Sutton, NH, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1991
Publication Information
Publication: In: Calibration of passive remote observing optical and microwave instrumentation; Proceedings of the Meeting, Orlando, FL, Apr. 3-5, 1991 (A93-23575 07-19)
Publisher: Society of Photo-Optical Instrumentation Engineers
Subject Category
Spacecraft Instrumentation
Accession Number
93A23588
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available