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You searched on: Author: yoshihiro ohno

Displaying records 11 to 20 of 176 records.
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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 ...

12. 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 ...

13. 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 ...

14. 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 ...

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 ...

16. 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 ...

17. Report on the Key Comparison CCPR K2.a-2003
Published: 10/30/2009
Authors: Yoshihiro Ohno, Steven W Brown, Thomas C Larason
Abstract: Under the framework of Mutual Recognition Arrangement (MRA) for national measurements standards and for calibration and measurement certificates issued by National Metrology Institutes (NMIs) signed in 1999, an international comparison of spectral re ...

18. 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 ...

19. Extension of the NIST tristimulus colorimeter for solid-state light source measurements
Published: 5/29/2009
Authors: George P Eppeldauer, Carl C Miller, Thomas C Larason, Yoshihiro Ohno
Abstract: In order to obtain improved color measurement uncertainties for solid state light (SSL) sources, the second generation tristimulus colorimeter of NIST has been extended with a fifth channel to perform efficient matrix corrections for the spectral mis ...

20. Illuminance responsivity calibration of reference photometers at the NIST SIRCUS and SCF facilities
Published: 5/29/2009
Authors: George P Eppeldauer, Carl C Miller, Thomas C Larason, Yoshihiro Ohno
Abstract: The illuminance responsivities of two transfer standard photometers have been directly determined from their spectral responsivity calibrations at two different calibration facilities of NIST. The main characteristics of the two photometers, and thei ...

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