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You searched on: Author: bettye johnson

Displaying records 41 to 50 of 159 records.
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41. Stray-Light Correction of the Marine Optical Buoy
Published: 6/1/2003
Authors: Steven W Brown, Bettye C Johnson, S Flora, M Feinholz, M Yarbrough, R Barnes, Y S Kim, Keith R. Lykke, D K Clark
Abstract: In ocean-color remote sensing, approximately 90% of the flux at the sensor originates from atmospheric scattering, with the water-leaving radiance contribution the remaining 10 % of the total flux. Consequently, errors in the measured top-of-the atm ...

42. Radiometric Measurement Comparison on the Integrating Sphere Source Used to Calibrate the Moderate Resolution Imaging Spectroradiometer (MODIS) and the Landsat 7 Enhanced Thematic Mapper Plus (ETM+)
Series: Journal of Research (NIST JRES)
Published: 5/1/2003
Authors: James J. Butler, Steven W Brown, Robert D. Saunders, Bettye C Johnson, S F Biggar, E F Zalewski, B L Markham, P N Gracey, J B Young, R Barnes
Abstract: As part of a continuing effort to validate the radiometric scales assigned to integrating spheresources used in the calibration of Earth Observing System (EOS) instruments, a radiometric measurement comparison was held in May 1998 at Raytheon/Santa B ...

43. Radiometric Calibration and Absolute Calibration of the Marine Optical System (MOS) Bench Unit
Published: 3/1/2003
Authors: C Habauzit, Steven W Brown, Keith R. Lykke, Bettye C Johnson, M E Feinholz, M Yarbrough, D K Clark

44. Radiometric Characterization and Absolute Calibration of the Marine Optical System (MOS) Bench Unit
Published: 3/1/2003
Authors: C Habauzit, Steven W Brown, Keith R. Lykke, Bettye C Johnson, M Feinholz, M Yarbrough, D K Clark
Abstract: The Marine Optical Spectrograph (MOS) is a dual CCD-based spectrograph system developed for in-water measurements of down-welling solar irradiance, {Epsilon}^dd^, and up-welling radiance, L^du^. These measurements are currently used in the calibratio ...

45. Uncertainty Budgets For Realisation of Scales By Radiation Thermometry
Published: 3/1/2003
Authors: J Fischer, M Battuello, M Sadli, M Ballico, S N Park, P Saunders, Y Zundong, Bettye C Johnson, E Van der Ham, W Li, F Sakuma, Graham Machin, N Fox, S Ugur, M Matveyev
Abstract: Some recent international comparisons and the preliminary results of the key comparison CCT-K5 evidenced that the realisation of theITS-90 above the freezing point of silver and its dissemination with tungsten strip lamps may be less straightforward ...

46. Comparison of Cryogenic Radiometry and Thermal Radiometry Calibrations at NIST Using Multichannel Filter Raidometers
Published: 2/7/2003
Authors: Bettye C Johnson, Steven W Brown, Keith R. Lykke, Charles E Gibson, G Fargion, G Meister, S B. Hooker, B L Markham, James J. Butler
Abstract: Comparison of independent measurement results allows an assessment of the accuracy of the underlying methods. In this work, four multichannel filter radiometers were calibrated using tunable laser-illuminated and lamp-illuminated integrating sphere ...

47. Simbad A Calibration Using a Laser Based Facility and Comparison With Previous Techniques
Published: 2/1/2003
Authors: N Souaidia, Steven W Brown, Bettye C Johnson
Abstract: Two multi-channel filter radiometers were calibrated using three different techniques: against a lamp-illuminated integrating sphere source, against a laser-illuminated integrating sphere source and by cross-calibration against a primary sun photomet ...

48. Stray-Light Correction Algorithm for Spectrographs
Published: 2/1/2003
Authors: Steven W Brown, Bettye C Johnson, M Feinholz, M Yarbrough, S Flora, Keith R. Lykke, D K Clark
Abstract: 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 ...

49. A Comparison of Laser-Based and Conventional Calibrations of Sun Photometers, ed. by G.S. Fargion and C.R. McClain
Published: 1/1/2003
Authors: N Souaidia, C Pietras, Steven W Brown, Bettye C Johnson, G Fargion

50. A Portable Integrating Sphere Source for the Earth Observing System's Calibration Validation Program
Published: 1/1/2003
Authors: Steven W Brown, Bettye C Johnson

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