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Author: howard yoon
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1. Validation of the dissemination of spectral irradiance values using FEL lamps
Published: 9/27/2012
Authors: Bettye C Johnson, Gary D. Graham, Robert D. Saunders, Howard W Yoon, Eric L Shirley
Abstract: Scales of spectral irradiance are disseminated from NIST by assignment of values to FEL-type lamp standards for defined conditions. These lamp standards can be used for absolute calibration of irradiance radiometers, or more typically, be used in con ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911954

2. 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

3. 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

4. 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

5. 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

6. 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

7. 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

8. 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

9. 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 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

10. Radiometer standard for absolute responsivity calibrations from 950 nm to 1650 nm with 0.05% (k = 2) uncertainty
Published: 6/2/2009
Authors: George P Eppeldauer, Howard W Yoon, Yuqin Zong, Thomas C Larason, Allan W. Smith, M. Racz
Abstract: A sphere-input transfer-standard detector has been developed to calibrate detectors and radiometers for absolute spectral power, irradiance, and radiance responsivity in the near-IR range with uncertainties similar to those of silicon trap-detector c ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=900973