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Author: howard yoon
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Displaying records 11 to 20 of 121 records.
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11. A versatile light-emitting-diode-based spectral response measurement system for photovoltaic device characterization
Published: 6/29/2012
Authors: Behrang H Hamadani, John F Roller, Brian P Dougherty, Howard W Yoon
Abstract: An absolute differential spectral response measurement system for solar cells is presented. The system couples an array of light emitting diodes (LEDs) with an optical waveguide to provide large area illumination. Two unique yet complementary measur ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910849

12. AC-Mode SW-IR Radiation Thermometers for Measurement of Ambient Temperatures
Published: Date unknown
Authors: George P Eppeldauer, Howard W Yoon
Abstract: 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 e ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841068

13. AC-mode SW-IR radiation thermometers for measurement of ambient temperatures
Published: 5/10/2007
Authors: George P Eppeldauer, Howard W Yoon
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=104430

14. 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

15. Absolute spectral responsivity measurements of solar cells by a hybrid optical technique
Published: 7/15/2013
Authors: Behrang H Hamadani, John F Roller, Brian P Dougherty, Fiona Persaud, Howard W Yoon
Abstract: An irradiance mode, absolute differential spectral response measurement system for solar cells is presented. The system is based on combining the monochromator-based approach of determining the power mode spectral responsivity of cells with an LED-b ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913725

16. 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} ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=840030

17. Assessment of the Accuracy of the MOBY Spectral Radiance Calibration Sources Using the SXR and the VXR
Published: 10/1/2000
Authors: Bettye C Johnson, Howard W Yoon, M Feinholz, D K Clark
Abstract: The Marine Optical Buoy (MOBY) and its related optical system the Marine Optical Sensor (MOS) consist of dual CCD-based spectrographs. MOBY, MOS, and other instruments operated by the MOBY team are used to provide in situ measurements of water-leavi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=841511

18. CCPR-S1 Supplementary Comparison for Spectral Radiance in the range of 220 nm to 2500 nm
Published: 6/2/2009
Authors: Boris Khlevnoy, Victor Sapritsky, Bernard Rougie, Charles E Gibson, Howard W Yoon, Arnold A. Gaertner, Dieter Taubert, Juergen Hartmann
Abstract: In 1997, the Consultative Committee for Photometry and Radiometry (CCPR) initiated a supplementary comparison of spectral radiance in the wavelength range from 220 nm to 2500 nm (CCPR S1) using tungsten -strip filament lamps as transfer standards. Fi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=900253

19. Calibrated Thermal Microscopy of the Tool-Chip Interface in Machining
Published: 1/1/2003
Authors: Matthew A Davies, Howard W Yoon, T L Schmitz, T J Burns, M D Kennedy
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=103716

20. Calibrated Thermal Microscopy of the Tool-Chip Interface in Machining
Published: 4/1/2000
Authors: Michael Kennedy, Matthew A. Davies, Howard W Yoon, Timothy J Burns
Abstract: A critical parameter in predicting tool wear during machining and in accurate computer simulations of machining is the spatially-resolved temperature at the tool-chip interface. We describe the development and the calibration of a nearly diffraction- ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=821922



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