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Author: howard yoon
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Displaying records 11 to 20 of 121 records.
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11. Hyperspectral Image Projector Applications
Published: 2/15/2012
Authors: Joseph Paul Rice, Steven W Brown, David W Allen, Howard W Yoon, Maritoni Abatayo Litorja, Jeeseong Hwang
Abstract: For the past several years NIST has been developing, along with several collaborators, a Hyperspectral Image Projector (HIP). This scene projector produces high-resolution programmable spectra and projects them into dynamic two-dimensional images ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910575

12. Towards realization of a large-area, LED-based solar simulator
Published: 11/27/2011
Authors: Behrang H Hamadani, Kangbin Chua, John F Roller, Howard W Yoon, Brian P Dougherty
Abstract: LED-based solar simulators have shown great promise as alternative light sources for indoor testing of PV cells as compared to their traditional counterparts. However, large-area uniform illumination more suitable for larger cells and module measurem ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908797

13. Comparison of a detector-based near-IR radiance-scale to an ITS-90 calibrated radiation thermometer
Published: 8/7/2011
Authors: George P Eppeldauer, Howard W Yoon, Jinan Zeng, Thomas C Larason
Abstract: Integrating-sphere-input InGaAs radiometers have been developed at the National Institute of Standards and Technology (NIST) to extend the detector-based calibrations from the Si range to the near-IR. These near-IR radiometers are used to determine t ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906022

14. SP250 Spectral Irradiance Calibrations
Series: Special Publication (NIST SP)
Report Number: 250-89
Published: 7/25/2011
Authors: Howard W Yoon, Charles E Gibson
Abstract: This document describes the process of the realization, the maintenance and the dissemination of the spectral irradiance scale and its accompanying uncertainties at the National Institute of Standards and Technology. It describes the measurement pro ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907923

15. Long-Term Monitoring of the Ultraviolet Irradiance Scale at the Facility for Irradiance Calibration Using Synchrotrons
Published: 6/18/2010
Authors: Zhigang Li, Ping-Shine Shaw, Uwe Arp, Charles E Gibson, Howard W Yoon, Keith R Lykke
Abstract: In 2004, the National Institute of Standards and Technology (NIST) established the ultraviolet (UV) spectral irradiance scale from 200 nm to 400 nm using the calculable irradiance of the Synchrotron Ultraviolet Radiation Facility (SURF). Since the es ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904737

16. Calibrations of Current-to-Voltage Transimpedance Amplifiers Using Electrical Standards
Published: 6/13/2010
Authors: Howard W Yoon, George P Eppeldauer, Dean G Jarrett, Thomas C Larason, Wan-Seop Kim
Abstract: For photocurrent measurements with low uncertainties, a wide-dynamic range current-to-voltage converter traceable to resistance standards has been developed at the NIST. The design and calibration of the converter standard are described. For validat ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905053

17. Spectral irradiance responsivity calibration of InSb radiometers using the improved IR-SIRCUS at NIST
Published: 10/15/2009
Authors: Jinan Zeng, Howard W Yoon, George P Eppeldauer, Leonard M Hanssen, Joseph Paul Rice
Abstract: The spectral irradiance responsivity calibrations of InSb radiometers measured on the tunable-laser based Infrared Spectral Irradiance and Radiance Responsivity Calibration with Uniform Sources (IR-SIRCUS) facility are discussed. This work describes ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903522

18. The Extension of the NIST BRDF Scale from 1100 nm to 2500 nm
Published: 8/21/2009
Authors: Howard W Yoon, David W Allen, George P Eppeldauer, Benjamin K Tsai
Abstract: Measurements of bi-directional reflectance factor for diffuse reflectance from 1100 nm to 2500 nm using extended-range indium gallium arsenide (exInGaAs) detectors in the NIST Spectral Tri-function Automated Reference Reflectometer (STARR) facility ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904078

19. Spectroradiometric Characterization of the NIST Pulsed Solar Simulator
Published: 8/20/2009
Authors: Howard W Yoon, Brian P Dougherty, Vladimir Khromchenko
Abstract: The spectroradiometric characterization of the NIST indoor pulsed solar simulator is described. The solar simulator has a flash duration of 36.4 ms and is designed for solar panels having a maximum size of 2.0 m by 1.6 m. As per industry standards, ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904077

20. 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



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