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Search Publications by: B. Carol Johnson (Fed)

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Displaying 76 - 100 of 178

Stray-Light Correction Algorithm for Spectrographs

February 1, 2003
Author(s)
Steven W. Brown, Bettye C. Johnson, M Feinholz, M Yarbrough, S Flora, Keith R. Lykke, D K. Clark
In this work, we describe an algorithm to correct a spectrograph's response for stray light. Two recursion relations are developed: one to correct the system response when measuring broad-band calibration sources and a second to correct the response when

Stray Light and Ocean Color Remote Sensing

January 1, 2003
Author(s)
Steven W. Brown, Bettye C. Johnson, N Souaidia, R Barnes, D K. Clark
Instruments used to make radiometric measurements of the ocean are typically calibrated against incandescent sources with a spectral distribution that peaks in the near-infrared, while the radiant flux from the ocean peaks in the blue to green spectral

System-Level Calibration of a Transfer Radiometer Used to Validate EOS Radiance Scales

January 1, 2003
Author(s)
Bettye C. Johnson, Steven W. Brown, George P. Eppeldauer, Keith R. Lykke
A number of transfer radiometers have been developed by the National Institute of Standards and Technology (NIST) with the support and funding of the National Aeronautics and Space Administration's (NASA's) satellite sensor calibration programs. The

Uncertainty Budgets for Realization of ITS-90 by Radiation Thermometry

January 1, 2003
Author(s)
J Fischer, M Battuello, M Sadli, M Ballico, S N. Park, P Saunders, Y Zundong, B. Carol Johnson, E Van der Ham, F Sakuma, Graham Machin, N Fox, W Li, S Ugur, M Matveyev
Recent international comparisons [1,2] and key comparisons have shown that the realization of the ITS-90 above the freezing point of silver and its dissemination may be less straightforward than expected. In many cases, the deviations of the local scale

Stray Light Characterization for MOBY

February 1, 2002
Author(s)
Bettye C. Johnson, Steven W. Brown, Keith R. Lykke, M Feinholz, M Yarbrough, S Flora, D K. Clark
The Marine Optical Spectrograpli (MOS) system is used as a down-welling irradiance and up-welling in-water radiance profiler in two configurations: as the sensor for the Marine Optical Buoy (MOBY) and as a mobile, sliipboard-deployable sensor. Both systems