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Optical Engineering

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

The NASA Goddard Space Flight Center (GSFC) Radiometric Calibration Laboratory (RCL) maintains several large integrating sphere sources covering the visible to the shortwave infrared wavelength range. Two critical, functional 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 could be an indication that the source requires maintenance or recalibration against the National Institute of Science and Technology irradiance standard. The GSFC RCL has developed a Filter Radiometer Monitoring System (FRMS) to continuously monitor the performance of its integrating sphere calibration sources in the 400 to 2400 nm region. Sphere output change mechanisms include lamp aging, coating (e.g., 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 are presented, as well as data from monitoring four of the RCL's integrating sphere sources.

Paper Details

Date Published: 1 November 2011
PDF: 13 pages
Opt. Eng. 50(11) 113603 doi: 10.1117/1.3646532
Published in: Optical Engineering Volume 50, Issue 11
Show Author Affiliations
Leibo Ding, Sigma Space Corp. (United States)
John W. Cooper, Sigma Space Corp. (United States)
Gilbert R. Smith, Sigma Space Corp. (United States)
Matthew G. Kowalewski, Universities Space Research Organization (United States)
Robert A. Barnes, Science Applications International Corp. (United States)
Eugene Waluschka, NASA Goddard Space Flight Ctr. (United States)
James J. Butler, NASA Goddard Space Flight Ctr. (United States)

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