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Displaying records 11 to 20 of 180 records.
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11. Experimental study of the visual adaptation field in mesopic photometry: Does surrounding luminance affect peripheral adaptation?
Published: 9/6/2013
Authors: Tatsukiyo (Tatsukiyo) Uchida, Yoshihiro Ohno
Abstract: CIE 191:2010 recommends a mesopic photometry system that defines the luminous efficiency function for peripheral visual tasks, which vary depending on adaptation state of observers. For implementation of the system, an adaptation field to determine t ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913653

12. Optical Measurements of OLED Panels for Lighting Applications
Published: 7/22/2013
Authors: Tokihisa Kawabata, Yoshihiro Ohno
Abstract: Optical characteristics of OLED panels have been investigated for the purpose of developing a test method for OLED panels for lighting applications. The electrical characteristics, total luminous flux and chromaticity (x, y), and their dependence ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913288

13. Chapter 13. Color Quality of White LEDs
Published: 5/24/2013
Author: Yoshihiro Ohno
Abstract: This chapter overviews the fundamentals of chromaticity and color rendering as the two important aspects of color quality of light sources for general illumination, with special focus on the use for solid state light sources. The section for chrom ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912950

14. EFFECT OF HIGH LUMINANCE SOURCES TO PERIPHERAL ADAPTATION STATE IN MESOPIC RANGE
Published: 4/15/2013
Authors: Tatsukiyo (Tatsukiyo) Uchida, Yoshihiro Ohno
Abstract: CIE 191:2010 recommends a mesopic photometry system that defines the spectral luminous efficiency function for peripheral visual tasks. For implementation of the system, the visual adaptation field, which takes into account the surrounding luminance ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913477

15. 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

16. 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

17. Four-color laser white illuminant demonstrating high color-rendering quality
Published: 7/4/2011
Authors: Alexander Neumann, Jonathan Wierer , Wendy L Davis, Yoshihiro Ohno, Steve Brueck, Jeff Tsao
Abstract: Solid-state lighting is currently based on light-emitting diodes (LEDs) and phosphors. Solid-state lighting based on lasers would offer significant advantages including high potential efficiencies at high current densities. Light emitted from lasers ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909303

18. 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

19. 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

20. Rationale of Color Quality Scale
Published: 6/10/2010
Authors: Yoshihiro Ohno, Wendy L Davis
Abstract: The color quality of solid state lighting (SSL) products is critical and is the subject of increasing attention. The CIE Color Rendering Index (CRI) [1] has been widely used for many years. However, the CRI is 35 years old and various problems of t ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905946



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