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Author: bettye johnson

Displaying records 41 to 50 of 166 records.
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41. New Technologies for Radiometry: Impact on Ocean Color Research
Published: 8/1/2003
Authors: Bettye C Johnson, Steven W Brown, N Souaidia, M Feinholz, M Yarbrough, S Flora, D K Clark
Abstract: Ocean color satellites provide global determinations of chlorophyll a by measurements of the spectral radiance of the oceans. This is a difficult measurement because the at-satellite radiance is dominated by the atmospheric contribution, and pre-fli ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841762

42. MOBY, A Radiometric Buoy for Performance Monitoring and Vicarious Calibration of Satellite Ocean Color Sensors: Measurement and Data Analysis Protocols
Published: 6/1/2003
Authors: D K Clark, Marilyn Yuen Murphy, M Yarbrough, M Feinholz, S Flora, W Broenkow, Bettye C Johnson, Steven W Brown, Y S Kim, J Mueller
Abstract: The Marine Optical Buoy (MOBY) (Clark et al. 1997) is the centerpiece of the primary ocean measurement site for calibration of satellite ocean color sensors based on independent in situ measurements. Since late 1996, the time series of normalized wa ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841593

43. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841707

44. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841717

45. 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
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=103837

46. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841585

47. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841719

48. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841690

49. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841694

50. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841618



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