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You searched on: Author: bettye johnson Sorted by: date

Displaying records 151 to 159.
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151. Comparison of Area Measurements of Apertures for Exo-Atmospheric Solar Irradiance Between NIST and JPL
Published: Date unknown
Authors: Maritoni Abatayo Litorja, Bettye C Johnson, J B. Fowler
Abstract: A comparison of the area measurements of the limiting apertures used for total solar irradiance measurements in the Active Cavity Radiometer Irradiance Monitor II (ACRIM II) and Active Cavity Radiometer Irradiance Monitor III (ACRIM III) were conduct ...

152. Intercomparisions of Reflectance Measurements
Published: Date unknown
Authors: P Y. Barnes, Bettye C Johnson, James J. Butler, C J Bruegge, S F Biggar, P R Spyak, M M Pavlov, E A. Early
Abstract: A comparison of spectral diffuse reflectance between different national standards laboratories is being planned under the direction of the Comit* Consultatif de Photom*trie et Radiom*trie (CCPR). A similar comparison of bi-directional reflectance di ...

153. Metrology for Remote Sensing Radiometry
Published: Date unknown
Authors: Bettye C Johnson, Steven W Brown, Joseph Paul Rice
Abstract: Metrology, the science of measurement, is discussed in terms of measurements of radiant flux and associated quantities. Radiometric measurements are naturally remote, that is, they are non-contact. A broad application is Earth science, as global meas ...

154. Overview of Radiation Thermometry
Published: Date unknown
Author: Bettye C Johnson
Abstract: Researchers in the Optical Technology Division utilize measurements of radiant flux to determine temperature. This includes the dissemination of the ITS-90 above 961.78 degrees C using spectral radiance ratios (optical pyrometry) and absolute measure ...

155. Radiometric Validation of NASA's Ames Research Center's Sensor Calibration Laboratory
Published: Date unknown
Authors: Steven W Brown, Bettye C Johnson, S F Biggar, E F Zalewski, J W Cooper, P Hajek, E Hildum, P Grant, R Barnes, James J. Butler

156. Simultaneous Measurement of Up-Welling Spectral Radiance Using a Fiber-Coupled CCD Spectrograph
Published: Date unknown
Authors: M Yarbrough, S Flora, M Feinholz, Terrance Houlihan, Yong S. Kim, Steven W Brown, Bettye C Johnson, Kenneth Voss, Dennis Clark
Abstract: Determination of the water-leaving spectral radiance using in-water instrumentation requires measurements of the up-welling spectral radiance (Lu) at several depths. If these measurements are separated in time, changes in the measurement conditions ...

157. Temperature Scales Using Radiation Thermometers Calibratied From Absolute Irradiance and Radiance Responsivity
Published: Date unknown
Authors: Howard W Yoon, David W Allen, Charles E Gibson, Robert D. Saunders, Bettye C Johnson, Steven W Brown, Keith R. Lykke
Abstract: In the International Temperature Scale of 1990 (ITS-90), temperatures above the freezing temperature of silver are defined with radiation thermometers calibrated using spectral radiance ratios to one of the silver-, gold- or copper-freezing temperatu ...

158. The Establishment and Verification of Traceability for Remote Sensing Radiometry, With an Eye Towards Intercomparison of Results
Published: Date unknown
Authors: Bettye C Johnson, Joseph Paul Rice, Steven W Brown
Abstract: Establishment of traceability is necessary for placing results and estimates of their uncertainty on an absolute scale. There are a number of factors that must be considered when comparing independent results during missions that cannot be neglected ...

159. Validation of Radiometric Standards for the Laboratory Calibration of Reflected-Solar Earth Observing Satellite Instruments
Published: Date unknown
Authors: James J. Butler, Bettye C Johnson, Joseph Paul Rice, Steven W Brown, R Barnes
Abstract: Historically, the traceability of the laboratory calibration of Earth-observing satellite instruments to a primary radiometric reference scale (SI units) is the responsibility of each instrument builder. For the NASA Earth Observing System (EOS), a ...

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