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Author: bettye johnson
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Displaying records 151 to 160 of 162 records.
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151. A Portable Integrating Sphere Source for Radiometric Calibrations From the Visible to the Short-Wave Infrared
Published: Date unknown
Authors: Steven W Brown, Bettye C Johnson
Abstract: A portable integrating sphere source has been developed by the National Institute of Standards and Technology (NIST) as part of a National Aeronautics and Space Administration s (NASA s) program to validate radiance scales of sources at Earth Observi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841351

152. Absolute Flux Calibrations of Stars
Published: Date unknown
Authors: Gerald T Fraser, Steven W Brown, Howard W Yoon, Bettye C Johnson, Keith R Lykke
Abstract: Absolute stellar photometry is based on 1970s terrestrial measurements of the star Vega referenced against the Cu fixed-point blackbody. Significant advances in absolute radiometry have been made in the last 30 years that offer the potential to impro ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841110

153. Area Measurements of Apertures for Exo-Atmospheric Solar Irradiance for 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841123

154. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841122

155. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841286

156. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841789

157. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841505

158. 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
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841853

159. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841121

160. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841740



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