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Proceedings Paper

Development of a filter radiometer monitor system for integrating sphere sources
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Paper Abstract

The NASA Goddard Space Flight Center (GSFC) Radiation Calibration Facility (RCF) maintains several large integrating sphere sources covering the visible and near infrared wavelength range. Two critical requirements of an integrating sphere source are short and long-term operational stability and repeatability. Monitoring the source is essential in determining the origin of systemic errors, thus increasing confidence in source performance, and quantifying repeatability. If monitor data falls outside the established parameters, this is an indication that the source requires maintenance or re-calibration against the National Institute of Science and Technology (NIST) irradiance standard. The GSFC RCF has developed a Filter Radiometer Monitoring System (FRMS) to continuously monitor the performance of its integrating sphere calibration sources in the 400-2400nm region. Sphere output change mechanisms include lamp aging, coating (BaSO4) deterioration, and ambient water vapor level. The FRMS wavelength bands are selected to quantify changes caused by these mechanisms. The FRMS design and operation is presented, as well as data from monitoring three of the RCF's integrating sphere sources.

Paper Details

Date Published: 21 August 2009
PDF: 11 pages
Proc. SPIE 7452, Earth Observing Systems XIV, 745206 (21 August 2009); doi: 10.1117/12.827721
Show Author Affiliations
Leibo Ding, Science Systems and Applications, Inc. (United States)
Matthew G. Kowalewski, Science Systems and Applications, Inc. (United States)
John W. Cooper, Science Systems and Applications, Inc. (United States)
Gilbert R. Smith, Science Systems and Applications, Inc. (United States)
James J. Butler, NASA Goddard Space Flight Ctr. (United States)


Published in SPIE Proceedings Vol. 7452:
Earth Observing Systems XIV
James J. Butler; Xiaoxiong Xiong; Xingfa Gu, Editor(s)

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