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You searched on: Author: bettye johnson

Displaying records 31 to 40 of 159 records.
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31. Summary of NIST Short Courses offered by the Optical Technology Division
Published: 1/1/2005
Authors: Carl C Miller, Howard W Yoon, Bettye C Johnson, Yoshihiro Ohno

32. Metrology for Remote Sensing Radiometry, ed. by S. Morain Page: A. Budge
Published: 1/1/2004
Authors: Bettye C Johnson, Steven W Brown, Joseph Paul Rice

33. A Comparison of Laser-Based and Conventional Calibrations of Sun Photometers
Published: 11/10/2003
Authors: N Souaidia, C Pietras, G Fargion, R A Barnes, R Frouin, Keith R Lykke, Bettye C Johnson, Steven W Brown

34. Advances in Radiometry for Ocean Color
Published: 11/10/2003
Authors: Steven W Brown, D K Clark, Bettye C Johnson, Howard W Yoon, Keith R Lykke, S Flora, M Feinholz, N Souaidia, C Pietras, Thomas C Stone, M Yarbrough, Y S Kim, R Barnes, J Mueller
Abstract: Organic materials in the oceans have spectral signatures based on their light-scattering properties. These optical properties are related to bio-physical and bio-chemical data products, such as the concentration of phytoplankton chlorophyll-{alpha} ...

35. Calibration and Characterization of Trap Detector Filter Radiometers
Published: 11/1/2003
Authors: David W Allen, George P Eppeldauer, Steven W Brown, E A. Early, Bettye C Johnson, Keith R Lykke
Abstract: We describe the development of a mechanically simple, radiometrically stable transfer radiometer designed for both radiance and irradiance measurements. The filter radiometer consists of a six-element Si trap detector, a temperature stabilized filter ...

36. Comparison of Laser-Based and Conventional Calibrations of Sun Photometers
Published: 11/1/2003
Authors: N Souaidia, C Pietras, G Fargion, R Barnes, R Frouin, Keith R Lykke, Bettye C Johnson, Steven W Brown
Abstract: Sun photometers are used to characterize the radiative properties of the atmosphere. They measure both the incident solar irradiance as well as the sky radiance (from scattered incident flux). Global networks of sun photometers provide data product ...

37. Preliminary Results of Aperture-Area Comparison for Exo-Atmospheric Solar Irradiance
Published: 11/1/2003
Authors: Bettye C Johnson, Maritoni Abatayo Litorja, James J. Butler
Abstract: Exo-atmospheric

38. The Development and Characterization of an Absolute Pyrometer Calibrated for Radiance Responsivity
Published: 9/1/2003
Authors: David W Allen, Robert D. Saunders, Bettye C Johnson, Charles E Gibson, Howard W Yoon
Abstract: The International Temperature Scale of 1990 (ITS-90), for temperatures above the freezing temperature of silver, is defined with pyrometers which rely upon spectral radiance ratios to one of the silver, gold or copper freezing temperature blackbodies ...

39. 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 ...

40. 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 ...

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