NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Collections About News Help Login
Back to Results
SeaWiFS Postlaunch Technical Report SeriesThe SeaWiFS Transfer Radiometer (SXR) was built for the Sea-viewing Wide Field-of-view Sensor (SeaWiFS) Project as part of an Interagency Agreement with the National Aeronautics and Space Administration (NASA). The SXR is a multichannel radiometer designed to verify and compare measurements of spectral radiance at six discrete wavelengths in the visible and near infrared for various calibration sources in the SeaWiFS Project. In addition, the SXR is used to compare these sources to standards of spectral radiance maintained at the National Institute of Standards and Technology (NIST). The SXR was designed, built, and thoroughly characterized in the Optical Technology Division at NIST. A unique optical design provides six independent optical paths, each equipped with a temperature stabilized interference filter and silicon photodiode. A separate beam path through the input lens is used to visually align the SXR. The entrance windows for each channel overlap at the source, with each channel sampling a unique solid angle within the field of view of the SXR; this allows for simultaneous sampling of all channels. The combined standard relative uncertainty of spectral radiance measurements with the SXR is estimated to be between 0.6% and 1.3%. This report describes the design and construction of the SXR in detail, and gives the results of the optical characterization and calibrations done at NIST. The SXR has been used for several intercomparisons which include several SeaWiFS Intercalibration Round-Robin Experiments (SIRREXs); those done at the Marine Optical Buoy (MOBY) laboratories in Honolulu, Hawaii; at the NEC Corporation in Yokohama, Japan; and Orbital Sciences Corporation (OSC) in Germantown, Maryland. Thorough optical characterization and calibration of the SXR was essential to the successful application of the radiometer for these measurements.
Document ID
19980232666
Acquisition Source
Goddard Space Flight Center
Document Type
Technical Memorandum (TM)
Authors
Hooker, Stanford B. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Firestone, Elaine R. (General Sciences Corp. Laurel, MD United States)
Johnson, B. Carol (National Inst. of Standards and Technology Gaithersburg, MD United States)
Cromer, Christopher L. (National Inst. of Standards and Technology Boulder, CO United States)
Date Acquired
August 18, 2013
Publication Date
September 1, 1998
Subject Category
Oceanography
Report/Patent Number
Rept-98B00075/VOL1
NAS 1.15:206892/VOL1
NASA/TM-1998-206892/VOL1
Funding Number(s)
CONTRACT_GRANT: NASA Order S-6496-E
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Related Records

There are no records associated with this record.
No Preview Available