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Search Publications by: Howard W. Yoon (Fed)

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Displaying 101 - 125 of 280

Thermodynamic Radiation Thermometry for the Next SI

November 15, 2007
Author(s)
Howard W. Yoon, Charles E. Gibson, V B. Khromchenko, George P. Eppeldauer, Robert R. Bousquet, Steven W. Brown, Keith R. Lykke
We describe the construction, the calibration and the use of the NIST Thermodynamic Radiation Thermometer (TRT) to measure the temperature of the gold-freezing temperature blackbody and a variable-temperature blackbody from 800 ?C to 2700 ?C. These

Absolute Flux Calibrations of Stars

August 30, 2007
Author(s)
Gerald T. Fraser, Steven W. Brown, Howard W. Yoon, Bettye C. Johnson, Keith R. Lykke
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 improve

AC-Mode SW-IR Radiation Thermometers for Measurement of Ambient Temperatures

May 25, 2007
Author(s)
George P. Eppeldauer, Howard W. Yoon
Recent improvements in the fabrication technology of short-wave infrared (SWIR) quantum detectors opened a new era in radiation thermometry. Ambient and higher temperatures can be measured with low uncertainties using thermoelectrically (TE) cooled

Thermodynamic-Temperature Determinations of the Ag and Au Freezing Temperatures Using a Detector-Based Radiation Thermometer

May 20, 2007
Author(s)
Howard W. Yoon, David W. Allen, Charles E. Gibson, Maritoni A. Litorja, Robert D. Saunders, Steven W. Brown, George P. Eppeldauer, Keith R. Lykke
We describe the development of a radiation thermometer calibrated for spectral radiance responsivity using cryogenic, electrical-substitution radiometry to determine the thermodynamic temperatures of the Ag- and Au-freezing temperatures. The absolute

Once is Enough in Radiometric Calibrations

February 1, 2007
Author(s)
Gerald T. Fraser, Charles E. Gibson, Howard W. Yoon, Albert C. Parr
The successful development of an Optical Technology Division quality system for optical radiation measurement services has provided the opportunity to reconsider the existing calibration procedures to improve quality and reduce costs. We have instituted

Synchrotron Radiation Based Irradiance Calibration From 200 nm to 400 nm at SURF III

January 1, 2007
Author(s)
Uwe Arp, Charles E. Gibson, Keith R. Lykke, Albert C. Parr, Robert D. Saunders, D J. Shin, Ping-Shine Shaw, Zhigang Li, Howard W. Yoon
A new facility for measuring source irradiance was commissioned recently at the National Institute of Standards and Technology (NIST). The facility uses the calculable radiation from the Synchrotron Ultraviolet Radiation Facility (SURF III) as the primary

Flow visualization of heated CO2 gas using thermal imaging

January 1, 2006
Author(s)
Joseph P. Rice, Howard W. Yoon, M H. Brenner, N R. Briggs, J G. Gillen
Walk-through portal detection systems are being developed to screen passengers for the presence of explosives in support of homeland security. These portals utilize a series of air-jets to remove the explosive particles for detection using ion mobility