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Author: yuqin zong
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1. DEVELOPMENT OF 2 pi¿ TOTAL SPECTRAL RADIANT FLUX STANDARDS AT NIST
Published: 4/23/2014
Authors: Yuqin Zong, Haiping Shen
Abstract: We have developed a new, reflector lamp based 2 pi transfer standard for total spectral radiant flux (TSRF) scale in the spectral range from 360 nm to 1100 nm. Correlated colour temperature of the standard lamp is 3000 K. Spectral aging rate is ±0.3 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915823

2. INFLUENCE OF CURRENT AND VOLTAGE HARMONIC DISTORTION ON THE POWER MEASUREMENT OF LED LAMPS AND LUMINAIRES
Published: 4/15/2013
Authors: Christophe Martinsons, Yuqin Zong, Carl C Miller, Yoshihiro Ohno
Abstract: Specific issues appear in the measurement of the electrical power of AC-powered LED lamps and luminaires because they often generate harmonic currents in a wide frequency range. The topic of this paper is to clarify the impact of these harmonic curre ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913513

3. The distance dependences and spatial uniformities of spectral irradiance standard lamps
Published: 10/19/2012
Authors: Howard W Yoon, Gary D. Graham, Robert D. Saunders, Yuqin Zong, Eric L Shirley
Abstract: We describe the characterization of a group of NIST spectral irradiance lamps at longer distances and larger angles than are typically issued by NIST. The spectral irradiances from the FEL lamps were measured from 50 cm to 150 cm at 8 different dist ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911999

4. Development of a fully automated LED lifetime test system
Published: 9/21/2012
Authors: Yuqin Zong, Jeff Hulett
Abstract: A fully automated system for light-emitting diode (LED) lifetime test has been developed and is undergoing validation. This system uses a 1 m integrating sphere for both aging and optical measurements of 480 LEDs. It features six test zones, each of ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912240

5. Stray light correction algorithm for multi-spectral hyperspectral spectrographs
Published: 6/1/2012
Authors: Michael Feinholz, Stephanie J Flora, Steven W Brown, Yuqin Zong, Keith R Lykke, Mark A. Yarbrough, Bettye C Johnson, D. K. Clark
Abstract: An algorithm is developed to correct a multi-channel fiber-coupled spectrograph for stray or scattered light within the system. The efficacy of the algorithm is evaluated based on a series of validation measurements of sources with different spectra ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909987

6. New method for spectral irradiance and radiance responsivity calibrations using kHz pulsed tunable optical parametric oscillators
Published: 3/2/2012
Authors: Yuqin Zong, Steven W Brown, George P Eppeldauer, Keith R Lykke, Yoshihiro Ohno
Abstract: Continuous-wave (CW) tunable lasers have been used for detector calibrations, especially for spectral irradiance and radiance responsivity, for many years at the National Institute of Standards and Technology (NIST) and other national metrology insti ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909993

7. Analysis of Uncertainties in Stray-Light Correction
Published: 12/1/2010
Author: Yuqin Zong
Abstract: Measurement errors arising from stray light within a spectroradiometer are often the dominant source of uncertainty and are difficult to reduce. However, the stray-light errors can be corrected by using a stray-light correction matrix that is derived ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906999

8. Determining phosphors‰ effective quantum efficiency for remote phosphor type of LED modules
Published: 12/1/2010
Authors: Arno Keppens, Yuqin Zong, Yoshihiro Ohno, Geert Deconinck, P. Hanselaer
Abstract: Without any doubt remote phosphor type of light-emitting diodes (LEDs) are gaining popularity in all kinds of solid-state lighting applications. Main reasons are the high luminous efficiency in comparison with proximate phosphor type of LED devices a ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907063

9. MEASUREMENT OF WEIGHTED LED RADIANCE RELATED TO PHOTOBIOLOGICAL SAFETY
Published: 12/1/2010
Authors: Tongsheng Mou, Yuqin Zong, Yoshihiro Ohno
Abstract: Optical radiation safety of light-emitting diode (LED) products is being addressed in the International Electrotechnical Commission (IEC) standard document 62471-2006. Measurement of weighted radiance of LEDs, used to assess the maximal exposure rela ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907390

10. Practical method for measurement of AC-driven LEDs at a given junction temperature by using active heat sinks
Published: 9/15/2009
Authors: Yuqin Zong, Pei-ting Chou, Min-Te Lin, Yoshihiro Ohno
Abstract: Alternating-current (AC) driven high-power light-emitting diodes (LEDs) have become available and introduced into solid-state lighting (SSL) products. AC LEDs operate directly from a mains supply with no need of drivers, and thus can simplify the des ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903558



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