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Author: Howard Yoon

Displaying records 1 to 10 of 116 records.
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1. Development of in-situ calibration method for current-to-voltage converters for high-accuracy SI-traceable low-DC-current measurements
Published: 9/20/2013
Authors: George P Eppeldauer, Howard W Yoon, Dean G Jarrett, Thomas C Larason
Abstract: For photocurrent measurements with low uncertainties, wide-dynamic range reference current-to-voltage converters and a new converter calibration method have been developed at the National Institute of Standards and Technology (NIST). The high feedba ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914149

2. 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

3. 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

4. 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

5. Extension of the NIST spectral power-responsivity calibration service to 2500 nm
Published: 3/2/2012
Authors: George P Eppeldauer, Howard W Yoon, Jinan Zeng, Thomas C Larason, Jeanne M Houston, Vladimir Khromchenko
Abstract: The National Institute of Standards and Technology (NIST) is working to extend the upper wavelength limit of the spectral power-responsivity calibration service from 1800 nm to 2500 nm. This extension is based on extended-InGaAs (EIGA) transfer- and ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910010

6. 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

7. 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

8. 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

9. 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

10. 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



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